10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2018

OR

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

For the transition period from ________________ to ________________

Commission file number: 1-35335

Groupon, Inc.

(Exact name of registrant as specified in its charter)

Delaware	27-0903295
(State or other jurisdiction of	(I.R.S. Employer
incorporation or organization)	Identification No.)
600 West Chicago Avenue, Suite 400 Chicago, Illinois	60654
(Address of principal executive offices)	(Zip Code)

312-334-1579

(Registrant's telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of each exchange on which registered
Common Stock, par value $0.0001	Nasdaq Global Select Market

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.         

Yes x No ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    

Yes ¨            No x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     

Yes x             No ¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).     

Yes  x             No ¨

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Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer x                           Accelerated filer ¨

Non-accelerated filer ¨                        Smaller reporting company ¨

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).        

Yes ¨             No  x

As of June 30, 2018, the aggregate market value of shares held by non-affiliates of the registrant was $2,034,326,435 based on the number of shares of common stock held by non-affiliates as of June 30, 2018 and based on the last reported sale price of the registrant's common stock on June 30, 2018.

As of February 8, 2019, there were 570,314,522 shares of the registrant's common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

The information required by Part III of this Report, to the extent not set forth herein, is incorporated herein by reference from the registrant's definitive proxy statement relating to the Annual Meeting of Stockholders to be held in 2019, which definitive proxy statement shall be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year to which this Report relates.

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TABLE OF CONTENTS

PART I	Page
Forward-Looking Statements	4
Item 1. Business	5
Item 1A. Risk Factors	13
Item 1B. Unresolved Staff Comments	32
Item 2. Properties	32
Item 3. Legal Proceedings	32
Item 4. Mine Safety Disclosures	33
PART II
Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	34
Item 6. Selected Financial Data	37
Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations	39
Item 7A. Quantitative and Qualitative Disclosure About Market Risk	73
Item 8. Financial Statements and Supplementary Data	74
Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure	136
Item 9A. Controls and Procedures	136
Item 9B. Other Information	138
PART III
Item 10. Directors, Executive Officers and Corporate Governance	139
Item 11. Executive Compensation	139
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	139
Item 13. Certain Relationships and Related Transactions, and Director Independence	139
Item 14. Principal Accounting Fees and Services	139
Part IV
Item 15. Exhibits, Financial Statement Schedules	140
Item 16. Form 10-K Summary (optional)	143

______________________________________________________

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PART I

FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, including statements regarding our future results of operations and financial position, business strategy and plans and our objectives for future operations. The words "may," "will," "should," "could," "expect," "anticipate," "believe," "estimate," "intend," "continue" and other similar expressions are intended to identify forward-looking statements. We have based these forward looking statements largely on current expectations and projections about future events and financial trends that we believe may affect our financial condition, results of operations, business strategy, short-term and long-term business operations and objectives, and financial needs. These forward-looking statements involve risks and uncertainties that could cause our actual results to differ materially from those expressed or implied in our forward-looking statements. Such risks and uncertainties include, but are not limited to, risks related to volatility in our operating results; execution of our business and marketing strategies; retaining existing customers and adding new customers; challenges arising from our international operations, including fluctuations in currency exchange rates, legal and regulatory developments and any potential adverse impact from the United Kingdom's likely exit from the European Union; retaining and adding high quality merchants; our voucherless offerings; cybersecurity breaches; competing successfully in our industry; changes to merchant payment terms; providing a strong mobile experience for our customers; maintaining and improving our information technology infrastructure; delivery and routing of our emails; claims related to product and service offerings; managing inventory and order fulfillment risks; litigation; managing refund risks; retaining and attracting members of our executive team; completing and realizing the anticipated benefits from acquisitions, dispositions, joint ventures and strategic investments; lack of control over minority investments; compliance with domestic and foreign laws and regulations, including the CARD Act, GDPR and regulation of the Internet and e-commerce; classification of our independent contractors or employees; tax liabilities; tax legislation; protecting our intellectual property; maintaining a strong brand; customer and merchant fraud; payment-related risks; our ability to raise capital if necessary and our outstanding indebtedness; global economic uncertainty; our common stock, including volatility in our stock price; our convertible senior notes; our ability to realize the anticipated benefits from the hedge and warrant transactions; and those risks and other factors discussed in Item 1A. Risk Factors of this Annual Report on Form 10-K, as well as in our consolidated financial statements, related notes, and the other financial information appearing elsewhere in this report and our other filings with the Securities and Exchange Commission ("SEC"). Moreover, we operate in a very competitive and rapidly changing environment. New risks emerge from time to time. It is not possible for our management to predict all risks, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. We do not intend, and undertake no obligation, to update any of our forward-looking statements after the date of this report to reflect actual results or future events or circumstances. Given these risks and uncertainties, readers are cautioned not to place undue reliance on such forward-looking statements.

As used herein, "Groupon," "we," "our," "us" and similar terms include Groupon, Inc. and its subsidiaries, unless the context indicates otherwise.

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ITEM 1. BUSINESS

Groupon is a global leader in local commerce, making it easy for people around the world to search and discover great businesses and merchandise. Our vision is to connect local commerce, increasing consumer buying power while driving more business to merchants through price and discovery. We want Groupon to be the destination that consumers check first when they are out and about; the place they start when they are looking to buy just about anything, anywhere, anytime. We provide consumers with savings and help them discover what to do, eat, see, buy and where to travel. By bringing the brick and mortar world of local commerce onto the Internet, Groupon is helping local merchants to attract customers and sell goods and services.

Groupon operates online local commerce marketplaces throughout the world that connect merchants to consumers by offering goods and services, generally at a discount. Consumers access those marketplaces through our websites, primarily localized groupon.com sites in many countries, and our mobile applications.

Our operations are organized into two segments: North America and International. See Item 8, Note 19, Segment Information. We offer goods and services through our online marketplaces in three primary categories: Local, Goods and Travel.

We generate both product and service revenue from our business operations. In prior years, we referred to product revenue and service revenue as "direct revenue" and "third-party and other revenue," respectively. This terminology change did not impact the amounts presented in the accompanying consolidated financial statements.

We earn product revenue from direct sales of merchandise inventory through our Goods category. We primarily earn service revenue from transactions in which we earn commissions by selling goods or services on behalf of third-party merchants. Those transactions generally involve a customer's purchase of a voucher through one of our online marketplaces that can be redeemed with a third-party merchant for specified goods or services (or for discounts on specified goods or services). Service revenue also includes commissions that we earn when customers make purchases with retailers using digital coupons accessed through our websites and mobile applications and from voucherless merchant offerings in which customers earn cash back on their credit card statements when they transact with third-party merchants.

Our results from 2018 were impacted by the strategic initiatives discussed in Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations. Those results include the following:

• Gross billings decreased to $5.2 billion in 2018, as compared with $5.6 billion in 2017. In 2018, 65.8% and 34.2% of our gross billings were generated in North America and International, respectively, as compared with 69.6% and 30.4% in 2017. Gross billings represent the total dollar value of customer purchases of goods and services. The substantial majority of our service revenue transactions is comprised of sales of vouchers and similar transactions in which we collect the transaction price from the customer and remit a portion of the transaction price to the third-party merchant who will provide the related goods or services. For these transactions, gross billings differs from revenue reported in our consolidated statements of operations, which is presented net of the merchant's share of the transaction price. For product revenue transactions, gross billings are equivalent to product revenue reported in our consolidated statements of operations.

• Revenue decreased to $2.6 billion in 2018, as compared with $2.8 billion in 2017. In 2018, 62.2% and37.8% of our revenue was generated in North America and International, respectively, as compared with 67.3% and 32.7% in 2017.

• Gross profit of $1.3 billion in 2018 was consistent with prior year. In 2018, 67.4% and 32.6% of our gross profit was generated in North America and International, respectively, as compared with 69.5% and 30.5% in 2017.

• Income from operations was $54.0 million in 2018, as compared with $29.4 million in 2017.

• The number of active customers, which is defined as unique user accounts that have made a purchase during the trailing twelve months ("TTM") either through one of our online marketplaces or directly with a merchant for which we earned a commission, decreased to 48.2 million as of December 31, 2018 from 49.5 million as of December 31, 2017.

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We are a Delaware corporation, incorporated on January 15, 2008 under the name "ThePoint.com, Inc." We started Groupon in October 2008 and officially changed our name to Groupon, Inc. by filing an amended certificate of incorporation on June 16, 2009. Our principal executive offices are located at 600 West Chicago Avenue, Suite 400, Chicago, Illinois 60654, and our telephone number at this address is (312) 334-1579. Our investor relations department can be reached via email at ir@groupon.com. Our website is www.groupon.com. Information contained on our website is not a part of this Annual Report on Form 10-K. We completed our initial public offering in November 2011 and our common stock is listed on the Nasdaq Global Select Market under the symbol "GRPN."

GROUPON, the GROUPON logo and other GROUPON-formative marks are trademarks of Groupon, Inc. in the United States or other countries. This Annual Report on Form 10-K also includes other trademarks of Groupon and trademarks of other persons.

Our Strategy

Our goal is to continue to build marketplaces that our customers rely on to discover and save on amazing things to do, eat, see, buy and where to travel. Key elements of our strategy include the following:

Enhance the customer experience. With a mobile-first strategy, we intend to improve the customer experience by continuing to invest in innovative, frictionless products and differentiated local supply coupled with strong national brands. As we build out our marketplaces, we want our customers to have a superior, frictionless experience when they use our product whether finding, booking, buying or redeeming an offer. For merchants, this includes providing capabilities to manage demand for their goods and services and improving their ability to acquire customers. For consumers, this includes easily finding offers and accessing features that augment the overall experience, as well as seamlessly purchasing and redeeming offers. We are currently investing in initiatives to improve the purchase and redemption experience, such as enhancing our mobile applications, testing offerings with voucherless redemption resulting in cash back directly to customers' credit cards, and adding direct booking capabilities. These initiatives are targeted at growing customer value via increased purchase frequency and gross profit per customer to drive long-term growth in our business.

Establish Groupon as an open platform. We ultimately want Groupon to become a daily habit for our customers and believe that significantly increasing the offerings available through our online local commerce marketplaces is critical to this goal. Our initiatives to grow our inventory of deal offerings include entering into commercial agreements with third parties that enable us to feature additional merchant offerings through our marketplaces, identifying new distribution channels through which to sell our marketplace offerings, and continuing to optimize the activities performed by our sales teams. Additionally, we believe that our efforts to increase our customer value may improve the health of our marketplaces, making our marketing and promotional services more effective for the merchants who feature offerings on our platform.

Continue to realize our international potential. In 2018, the gross profit generated by our International segment represented 32.6% of our consolidated gross profit. We maintain a long-term focus on driving International to achieve gross profit that is more comparable to that of North America. Our initiatives to grow International gross profit include increasing our international marketing spending and leveraging enhanced marketing analytics, prioritizing more technology resources in order to expand and advance its product and service offerings, growing our inventory of deal offerings by entering into commercial agreements with third parties that enable us to feature additional merchant offerings through our marketplaces, and other initiatives.

Maintain culture of operational efficiency. Our company runs with a fundamental emphasis on maximizing operational efficiency. While we expect to invest in our key initiatives, we will continue to do so as disciplined operators and seek out opportunities to improve our efficiency.

Our Business

We earn revenue from transactions in which we provide marketing services primarily by selling vouchers through our online local marketplaces that can be redeemed for goods or services with third-party merchants. Our service revenue from those transactions is reported on a net basis as the purchase price received from the customer for the voucher less an agreed upon portion of the purchase price paid to the merchant. We also earn revenue by selling merchandise inventory directly to customers through our online marketplaces. Our product revenue from those transactions is the purchase price received from the customer.

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Our business model has evolved in recent years from primarily an email-based "push" model with a limited number of deals offered at any given time to more extensive online "pull" marketplaces, where customers can come to Groupon's websites and mobile applications to search and browse for deals on goods and services. We also publish ratings and helpful tips from customers to highlight the unique aspects of local merchants, including merchants that have featured offerings through our marketplaces.

Local. Our Local category includes offerings from local and national merchants, as well as local events. Local also includes other revenue sources such as commission revenue and advertising revenue, as these revenue sources are primarily generated through our relationships with local and national merchants. Our local offerings comprise multiple subcategories, including events and activities, beauty and spa, health and fitness, food and drink, home and garden and automotive. National merchants also have used our marketplaces as an alternative to traditional marketing and brand advertising. Although our business today is weighted toward offerings from local merchants, we continue to feature offerings from national merchants to build our brand awareness, acquire new customers and generate additional revenue. In addition to local and national deals, we give consumers the ability to access digital coupons from thousands of retailers through our Coupons offering. We also offer deals on concerts, sports, theater and other live entertainment events. We are increasingly featuring offerings on our site from other online marketplaces to further expand local offerings.

Goods. In our Goods category, we earn product revenue from transactions in which we sell merchandise inventory directly to customers, as well as service revenue from transactions in which third-party merchants sell products to customers through our marketplaces. Our Goods category offers customers the ability to find discounted merchandise across multiple product lines, including electronics, sporting goods, jewelry, toys, household items and apparel. We expect that we will continue to add new brands to our platform in order to expand our offerings.

Travel. Through our Travel category, we feature travel offers at both discounted and market rates, including hotels, airfare and package deals covering both domestic and international travel. For many of our travel offerings, the customer must contact the merchant directly to make a travel reservation after purchasing a travel voucher from us. However, for some of our hotel offerings, customers make room reservations directly through our websites.

Distribution

Our customers access our online local commerce marketplaces through our mobile applications and our websites, which primarily consist of localized groupon.com sites in countries throughout the world. We use a variety of marketing channels to direct customers to the deal offerings available through these marketplaces, as described in the Marketing section below.

Consumers predominately access our offerings through our mobile applications and, to a lesser extent, through mobile web browsers. Our applications and mobile websites enable consumers to browse, purchase, manage and redeem deals on their mobile devices. In addition, the mobile experience leverages location in several ways, enabling consumers to filter by distance, discover deals near them and visualize the assortment of Groupon offers through a maps view. For the year ended December 31, 2018, over 70% of our global transactions were completed on mobile devices.

Marketing

We primarily use marketing to acquire and retain high-quality customers and promote awareness of our marketplaces. In North America, we are using improved marketing analytics to drive efficiency in our marketing spend and maximize the lifetime value of our customer base. Internationally, we are also leveraging improved marketing analytics while ramping up overall marketing spend to drive customer acquisition. In total, we decreased our global marketing spend by $5.2 million, or1.3%, for the year ended December 31, 2018 as compared with the prior period. We expect to continue to use marketing in future periods in connection with our efforts to acquire and retain high-quality customers.

We use a variety of marketing channels to make customers aware of the deal offerings on our mobile and web platforms, including search engines, email and push notifications, affiliate channels, social and display advertising and offline marketing.

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Search engines. Customers can access our deal offerings indirectly through third-party search engines. We use search engine optimization ("SEO") and marketing ("SEM") to increase the visibility of our offerings in web search results.

Email and push notifications. We use targeting technology to determine which deal offerings to communicate to our subscribers based on their locations and personal preferences. A subscriber who clicks on a deal offering within an email or push notification is directed to our website or mobile application to learn more about the deal and be able to make a purchase.

Affiliate channels. We have an affiliate program that utilizes third parties to promote our deal offerings online. Affiliates earn commissions when customers access our deal offerings through links on their websites and make purchases on our platform. We expect to continue to leverage affiliate relationships to extend the distribution of our deals to a broad base of potential customers.

Social and display. We publish deals through various social networks and adapt our notifications to the particular format of each of these social networking platforms. Our websites and mobile application interfaces enable consumers to share deal offerings with their personal social networks. We also promote our deal offerings using display advertising on websites.

Television and other offline. We use offline marketing such as television advertising, and to a lesser extent, print and radio advertising, to help build awareness of our offerings and brand strength.

Our marketing activities also include elements that are not presented as Marketing on our consolidated statements of operations, such as order discounts and free shipping on qualifying merchandise sales.

Sales and Operations

Our sales force consists of 2,268 merchant sales representatives and sales support staff, who build merchant relationships and provide local expertise. Our North American merchant sales representatives and support staff are primarily based in our offices in Chicago and Phoenix, and our international merchant sales representatives and support staff are based in their respective local offices. Our global sales and sales support headcount by segment as of December 31, 2018 was as follows:

North America	934
International	1,334
Total	2,268

Other key operational functions include editorial, merchant development, customer service, technology, merchandising and logistics. Our editorial department is responsible for creating the written and visual content on the deals we offer. The merchant development team works with merchants to plan the deal before an offering is active and serve as an ongoing point of contact for the merchant over the term of a deal. Our customer service department is responsible for answering questions via phone, email, chat and on social media platforms regarding purchases, shipping status, returns and other areas of customer inquiry. Our technology team is focused on the design and development of new features and products to enhance the customer and merchant experience, maintenance of our websites and development and maintenance of our internal systems. Merchandising and logistics personnel are responsible for managing inventory and the flow of products from suppliers to our customers.

Our websites are hosted at two U.S. data centers in California and at an international data center in Ireland. Our data centers host our public-facing websites and applications, as well as our back-end business intelligence systems. We employ security practices to protect and maintain the systems located at our data centers. We have invested in intrusion and anomaly detection tools to try to recognize intrusions to our websites. We engage independent third-party Internet security firms to regularly test the security of our websites and identify vulnerabilities. In financial transactions with customers conducted on our websites and mobile applications, we use data encryption protocols to secure information while in transit. See Risk Factors for additional information relating to cyber threats.

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Competition

Our business is rapidly evolving and we face competition from a variety of sources. Some of our competitors offer deals as an add-on to their core business, and others have adopted a business model similar to ours. We also compete against companies that offer other types of advertising and promotional services to local businesses. In addition to such competitors, we expect to increasingly compete against other large Internet and technology-based businesses that have launched initiatives in the local space. We also expect to compete against other Internet sites that are focused on specific communities or interests and offer coupons or discount arrangements related to such communities or interests. Further, as our business continues to evolve, we anticipate facing new competition. We believe the principal competitive factors in our markets include the following:

• quality and performance of our merchants;

• size and composition of our customer base;

• mobile penetration;

• understanding of local business trends;

• ability to structure deal offerings to generate a positive return on investment for merchants;

• ability to generate large volumes of sales; and

• reputation, strength and recognition of brand.

Although we believe that we compete favorably on the factors described above and benefit from scale, we anticipate that larger, more established companies may directly compete with us over time. Many of our current and potential competitors have longer operating histories, significantly greater financial, technical, marketing and other resources, greater scale and larger customer bases than we do. These factors may allow our competitors to benefit from their existing customer base with lower acquisition costs or to respond more quickly than we can to new or emerging technologies and changes in customer requirements. These competitors may engage in more extensive research and development efforts, undertake more far-reaching marketing campaigns and adopt more aggressive pricing policies, which may allow them to build a larger subscriber base or to monetize that subscriber base more effectively than we do. Our competitors may develop products or services that are similar to our products and services or that achieve greater market acceptance than our products and services.

Seasonality

Some of our offerings experience seasonal buying patterns mirroring that of the larger consumer retail and e-commerce markets, where demand declines during customary summer vacation periods and increases during the fourth quarter holiday season. We believe that this seasonality pattern has affected, and will continue to affect, our business and quarterly sequential revenue growth rates. We recognized 30.3%, 30.7% and 30.0% of our annual revenue during the fourth quarter of 2018, 2017 and 2016.

Regulation

We are subject to a number of foreign and domestic laws and regulations that affect companies conducting business on the Internet. Additionally, those laws and regulations may be interpreted differently across domestic and foreign jurisdictions. As a company in a relatively new and rapidly innovating industry, we are exposed to the risk that many of those laws may evolve or be interpreted by regulators or in the courts in ways that could materially affect our business. Those laws and regulations may involve taxation, unclaimed property, intellectual property, product liability, travel, distribution, electronic contracts and other communications, competition, consumer protection, the provision of various online payment services, employee, merchant and customer privacy and data security or other areas.

The Credit Card Accountability Responsibility and Disclosure Act of 2009 (the "CARD Act"), as well as the laws of most states, contain provisions governing gift cards, gift certificates, stored value or pre-paid cards or coupons ("gift cards"). Groupon vouchers may be included within the definition of "gift cards" under many laws. In addition, certain foreign jurisdictions have laws that govern disclosure and certain product terms and conditions, including restrictions on expiration dates and fees, that may apply to Groupon vouchers. There are also a number of legislative proposals pending before the U.S. Congress, various state legislative bodies and foreign governments that could affect us, and our global operations may be constrained by regulatory regimes and laws in Europe and other jurisdictions outside the United States that may be more restrictive and adversely impact our business.

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Various U.S. laws and regulations, such as the Bank Secrecy Act of 1970 (the "Bank Secrecy Act"), the Dodd-Frank Wall Street Reform and Consumer Protection Act, the USA PATRIOT Act and the CARD Act impose certain anti-money laundering requirements on companies that are financial institutions or that provide financial products and services. Those laws and regulations broadly define financial institutions to include money services businesses such as money transmitters, check cashers and sellers or issuers of stored value. Requirements imposed on financial institutions under those laws include customer identification and verification programs, record retention policies and procedures and transaction reporting. We do not believe that we are a financial institution subject to those laws and regulations.

We are subject to a variety of federal, state and international laws and regulations governing consumer data. The General Data Protection Regulation ("GDPR"), which was recently adopted by the European Union became effective in May 2018, requires companies to satisfy new requirements regarding the handling of personal and sensitive data, including its collection, use, protection and the ability of persons whose data is stored to correct or delete such data about themselves. Complying with the GDPR caused us to update certain business practices and systems. Non-compliance with GDPR could result in proceedings against us by governmental entities or others and fines up to the greater of €20 million or 4% of annual global revenue. In addition, the State of California adopted the California Consumer Protection Act of 2018 (“CCPA”), which will become effective in 2020 and also will regulate the collection and use of consumers’ data. Compliance with the CCPA is expected to cause us to make additional updates to certain business practices and systems.

Intellectual Property

We protect our intellectual property rights by relying on federal, state and common law rights, as well as contractual restrictions. We control access to our proprietary technology by entering into confidentiality and invention assignment agreements with our employees and contractors, and confidentiality agreements with third parties.

In addition to those contractual arrangements, we also rely on a combination of trade secrets, copyrights, trademarks, service marks, trade dress, domain names and patents to protect our intellectual property. Groupon and its related entities own a number of trademarks and service marks registered or pending in the United States and internationally. In addition, we own a number of issued patents and pending patent applications in the United States and internationally and own and have applied for copyright registrations in the United States.

Circumstances outside our control could pose a threat to our intellectual property rights and the efforts we have taken to protect our proprietary rights may not be sufficient or effective or deter independent development of equivalent or superior intellectual property rights by others. Any significant impairment of our intellectual property rights could harm our business or our ability to compete. Also, protecting our intellectual property rights is costly and time-consuming. Any unauthorized disclosure or use of our intellectual property could make it more expensive to do business and harm our operating results.

Companies in the Internet, technology and other industries as well as non-practicing entities may own large numbers of patents, copyrights and trademarks or other intellectual property rights and may request license agreements, threaten litigation or file suit against us based on allegations of infringement or other violations of intellectual property rights. We are currently subject to, and expect to face in the future, lawsuits and allegations that we have infringed the intellectual property rights of third parties. As our business grows, we will likely face more claims of infringement, and may experience an adverse result which could impact our business and/or our operating results.

We have received in the past, and we anticipate we will receive in the future, communications alleging that items offered or sold through our website infringe third-party copyrights, trademarks, patents and trade names or other intellectual property rights or that we have otherwise infringed third parties’ past, current or future intellectual property rights. We may be unable to prevent third parties from offering and selling unlawful or infringing goods or goods of disputed authenticity, and we may be subject to allegations of civil or criminal liability for unlawful activities carried out by third parties through our website. We may implement measures in an effort to protect against these potential liabilities that could require us to spend substantial resources and/or to reduce revenue by discontinuing certain service offerings. Any costs incurred as a result of liability or asserted liability relating to the sale of unlawful goods or the unlawful sale of goods could harm our business.

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Employees

As of December 31, 2018, there were 2,522 employees in our North America segment, consisting of934sales representatives and 1,588 corporate, operational and customer service representatives, and 4,054 employees in our International segment, consisting of 1,334 sales representatives and2,721corporate, operational and customer service representatives.

Executive Officers

The following table sets forth information about our executive officers:

Name	Age	Position
Rich Williams	44	Chief Executive Officer and Director
Michael Randolfi	46	Chief Financial Officer
Steve Krenzer	60	Chief Operating Officer
Dane Drobny	51	General Counsel and Corporate Secretary
Melissa Thomas	39	Chief Accounting Officer and Treasurer

Rich Williams has served as our Chief Executive Officer and a member of our Board of Directors since November 2015. Prior to this role, Mr. Williams served as our Chief Operating Officer since June 2015 and President of North America since October 2014. He joined the Company in June 2011 as Senior Vice President of Marketing. Prior to joining Groupon, Mr. Williams served in a variety of marketing leadership roles at Amazon.com, Inc. (NASDAQ: AMZN) from January 2008 to June 2011, most recently as the Director, Paid Traffic leading global advertising. Prior to joining Amazon, he spent nearly seven years in sales and marketing leadership roles at Experian plc (LSE: EXPN), a global information services company.

Michael Randolfi has served as our Chief Financial Officer since April 2016. Prior to joining Groupon, Mr. Randolfi served as the Chief Financial Officer of Orbitz Worldwide, Inc. (NYSE: OWW) from March 2013 until November 2015 (when he departed following its acquisition by Expedia, Inc.). Prior to joining Orbitz, Mr. Randolfi served as Vice President and then as Senior Vice President and Controller at Delta Air Lines (NYSE: DAL) from February 2008 to February 2013. From June 1999 to February 2008, he held various executive positions at Delta Air Lines in financial planning and analysis, controllership and treasury. Prior to his 14-year career at Delta, Mr. Randolfi held positions with Continental Airlines (NYSE: UAL) and Raymond James and Associates (NYSE: RJF). Mr. Randolfi is a CPA and a certified management accountant.

Steve Krenzer has served as our Chief Operating Officer since November 2017. Prior to joining Groupon, Mr. Krenzer was the Chief Executive Officer of Core Digital Media, Inc. from October 2012 to November 2017. From November 1996 to October 2012, Mr. Krenzer held a variety of senior executive positions at Experian (LSE: EXPN), ultimately serving as President of Interactive Media.

Dane Drobny has served as our General Counsel and Corporate Secretary since July 2014. Prior to joining Groupon, Mr. Drobny was Senior Vice President, General Counsel and Corporate Secretary at Sears Holdings Corporation (NASDAQ: SHLD) from May 2010 to June 2014. Prior to joining Sears Holdings, he spent 17 years at the international law firm of Winston & Strawn LLP, most recently as a partner. 

Melissa Thomas has served as our Chief Accounting Officer and Treasurer since November 2018. Prior to this role, Ms. Thomas served as our Vice President of Commercial Finance since May 2017. Prior to joining Groupon, Ms. Thomas served as Vice President of Finance at Surgical Care Affiliates from June 2016 to May 2017. From August 2007 to May 2016, Ms. Thomas served in a variety of finance and accounting leadership roles at Orbitz Worldwide (NYSE: OWW), most recently as Vice President of Finance. Prior to Orbitz, Ms. Thomas held accounting positions at Equity Office Properties and began her career at PricewaterhouseCoopers.

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Available Information

We electronically file reports with the SEC. The SEC maintains an Internet site (www.sec.gov) that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC. Copies of our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 are also available free of charge through our website (www.groupon.com), as soon as reasonably practicable after electronically filing with or otherwise furnishing such information to the SEC, and are available in print to any stockholder who requests them. Our Code of Conduct, Corporate Governance Guidelines and committee charters are also posted on the site. We use our Investor Relations website (investor.groupon.com) and our blog (www.groupon.com/blog) as a means of disclosing material non-public information and for complying with our disclosure obligations under Regulation FD. Information contained on our website and blog is not a part of this Annual Report on Form 10-K.

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ITEM 1A. RISK FACTORS

Our business, prospects, financial condition, operating results and the trading price of our common stock could be materially adversely affected by the risks described below. In assessing those risks, you should also refer to the other information contained in this Annual Report on Form 10-K, including Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations (MD&A) and the consolidated financial statements and the related notes in Part II, Item 8. Financial Statements and Supplementary Data of this Annual Report on Form 10-K.

Risks Related to Our Business

Our operating results may vary significantly from quarter to quarter.

Our operating results may vary significantly from quarter to quarter due to seasonality and other reasons such as the rapidly evolving nature of our business. We believe that our ability to achieve and maintain profitability will depend, among other factors, on our ability to:

• acquire new customers and retain existing customers;

• attract and retain quality merchants;

• effectively address and respond to challenges in international markets;

• expand the number, variety and relevance of products and deals we offer, including through third party business partners and technology integrations, as we attempt to build a more complete local marketplace;

• our ability to leverage other platforms to display our offerings;

• achieve additional mobile adoption to capitalize on customers' continued shift toward mobile device usage;

• increase the awareness of our brand;

• successfully achieve the anticipated benefits of business combinations or acquisitions, strategic investments, divestitures and restructuring activities;

• provide a superior customer service experience for our customers;

• avoid interruptions to our services, including as a result of attempted or successful cybersecurity attacks or breaches;

• respond to continuous changes in consumer and merchant use of technology;

• offset declines in email, search engine optimization ("SEO") and other free traffic and further diversify our traffic channels;

• react to challenges from existing and new competitors;

• respond to seasonal changes in supply and demand; and

• address challenges from existing and new laws and regulations.

In addition, our margins and profitability may depend on our product sales mix, our geographic revenue mix and merchant and third-party business partner pricing terms. In recent years, we have shifted the focus on our websites and mobile applications toward offerings with higher gross profit in connection with our efforts to drive long-term gross profit growth. If we are not successful in achieving this objective, our business, financial position and results of operations could be harmed. Further, sales in our Goods category may constitute a greater percentage of our sales in certain periods relative to other categories, which may result in lower margins and profitability during those periods. Accordingly, our profitability may vary significantly from quarter to quarter.

Our strategy to grow our business may not be successful and may expose us to additional risks.

Our strategy to grow our business focuses on several key priorities including enhancing the customer experience, establishing Groupon as an open platform, realizing the potential of our international business and maintaining a culture of operational rigor. We have undertaken several initiatives as we execute this strategy.

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We have prioritized building great products and customer experience. To this end, we have continued to invest in improving the customer experience, from search to purchase to redemption, in removing friction from our websites and mobile applications and in product development (for example through card-linked offerings and booking capabilities). There are no assurances that our actions or product offerings will be successful in improving the customer experience, increasing our customer base, or improving customer purchase frequency in the short term or at all. If we are unable to realize expected outcomes from the execution of our strategy, our business and operating results may be harmed.

In addition, as we focus on building out a more extensive local commerce marketplace platform, we have also devoted significant resources to increasing the number of offers on our platform, attracting new merchants, retaining merchants who are willing to run deals on a continuous basis with us and engaging with third-party business partners via technology integrations in order to build a significant inventory for our customers. We have accepted, and expect to continue to accept, a lower portion of the gross billings from some of our merchants and business partners as we expand our marketplaces and introduce new products. In addition, we are continuously refining our process for presenting the most relevant deals to our customers based on their personal preferences and location. We are also continuing our efforts to optimize the mix of products that we offer. If we are not successful in achieving these objectives, our business, financial position and results of operations could be harmed. Further, we have implemented technology integrations with a number of third party business partners that we rely on to support various products and augment inventory across all categories of our business. Significant disruption in these services, or breakdown of these relationships, could negatively impact our ability to grow.

With respect to our international markets, we expect to continue to focus on improving our products and customer experience and applying our North American playbook to our International business. If we are unable to successfully execute these initiatives and realize the potential of our international markets, our business and operating results may be harmed.

Our efforts to execute our strategy may prove more difficult than we currently anticipate, and we may not succeed in realizing the benefits of these efforts, including increasing gross profit, unit growth or gross profit per customer, in a short time frame or at all.

Our financial results may be adversely affected if we are unable to execute on our marketing strategy.

Our marketing strategy is focused on acquiring and retaining customers who we believe will have higher long-term value, activation and conversion, purchase frequency and mobile application downloads, as well as increasing awareness of our brand and online marketplaces and introducing consumers and merchants to new products. We expect to continue to focus on maintaining a payback period on our global marketing spend of approximately 12 to 18 months; however, there are no assurances that we will be able to achieve this result. If any of our assumptions regarding our marketing activities and strategies prove incorrect, including with respect to payback periods and the efficiency of our marketing spend, our ability to generate gross profit from our investments may be less than we anticipated. In such case, we may need to increase marketing expenditures or otherwise alter our strategy and our results of operations could be negatively impacted.

If we fail to retain our existing customers or acquire new customers, our operating results and business will be harmed.

We must continue to retain and acquire customers who make purchases on our platform in order to increase profitability. Further, as our customer base evolves, the composition of our customers may change in a manner that makes it more difficult to generate revenue to offset the loss of existing customers and the costs associated with acquiring and retaining customers and to maintain or increase our customers’ purchase frequency. If customers do not perceive our offerings to be attractive or if we fail to introduce new and more relevant deals or increase awareness and understanding of the offerings on our marketplace platform, we may not be able to retain or acquire customers at levels necessary to grow our business and profitability. Further, the organic traffic to our websites and mobile applications, including traffic from consumers responding to our emails, has declined in recent years, such that an increasing proportion of our traffic is generated from paid marketing channels, such as search engine marketing. In addition, changes to search engine algorithms or similar actions are not within our control and could adversely affect traffic to our websites and mobile applications. If we are unable to acquire new customers in numbers sufficient to grow our business and offset the number of existing active customers that have ceased to make purchases, or if new

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customers do not make purchases at expected levels, our profitability may decrease and our operating results may be adversely affected.

Our international operations are subject to varied and evolving commercial and regulatory challenges, and our inability to adapt to the diverse and changing landscapes of our international markets may adversely affect our business.

Our international operations require management attention and resources and also require us to localize our services to conform to a wide variety of local cultures, business practices, laws and policies. Our international operations are subject to numerous risks, including the following:

• our ability to maintain merchant and customer satisfaction such that our marketplace will continue to attract high quality merchants;

• our ability to successfully respond to macroeconomic challenges, including by optimizing our deal mix to take into account consumer preferences at a particular point in time;

• political, economic and civil instability and uncertainty (including acts of terrorism, civil unrest, labor unrest, violence and outbreaks of war);

• currency exchange rate fluctuations;

• strong local competitors, who may better understand the local market and/or have greater resources in the local market;

• different regulatory or other legal requirements, including regulation of gift cards and coupon terms, Internet services, professional selling, distance selling, bulk emailing, privacy and data protection (including GDPR, which became effective in May 2018), cybersecurity, business licenses and certifications, taxation (including the European Union's voucher directive, digital service tax and similar regulations), consumer protection laws including those restricting the types of services we may offer (e.g., medical-related services), banking and money transmitting, that may limit or prevent the offering of our services in some jurisdictions, cause unanticipated compliance expenses or limit our ability to enforce contractual obligations;

• our ability to use a common technology platform in our North America and International segments to operate our business without significant business interruptions or delays;

• difficulties in integrating with local payment providers, including banks, credit and debit card networks and electronic funds transfer systems;

• different employee and employer relationships and the existence and actions of workers' councils and labor unions;

• difficulty in staffing, developing and managing foreign operations, including through centralized shared service centers, as a result of distance, language barriers and cultural differences;

• seasonal reductions in business activity;

• expenses associated with localizing our products; and

• differing intellectual property laws.

We are subject to complex foreign and U.S. laws and regulations that apply to our international operations, such as data privacy and protection requirements, including GDPR, the Foreign Corrupt Practices Act, the UK Anti-Bribery Act and similar local laws prohibiting certain payments to government officials, banking and payment processing regulations and anti-competition regulations, among others. The cost of complying with these various, and sometimes conflicting, laws and regulations is substantial. We have implemented and continue to implement policies and procedures to ensure compliance with these laws and regulations, however, we cannot ensure that our employees, contractors, or agents will not violate our policies. Changing laws, regulations and enforcement actions in the United States and throughout the world could harm our business. If commercial and regulatory constraints in our international markets restrict our ability to conduct our operations or execute our strategic plan, our business may be adversely affected.

In addition, we are subject to risks associated with the withdrawal of the United Kingdom from the European Union (“Brexit”). In March 2017, the United Kingdom formally notified the European Union of its intention to withdraw,

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and withdrawal negotiations began in June 2017. European Union rules provide for a two-year negotiation period, ending on March 29, 2019, unless an extension is agreed to by the parties. There remains significant uncertainty about the future relationship between the United Kingdom and the European Union, including the possibility of the United Kingdom leaving the European Union without a negotiated and bilaterally approved withdrawal plan. We have significant operations in both the United Kingdom and the European Union. Our operations and that of our merchants are highly integrated across the United Kingdom and the European Union, and we are highly dependent on the free flow of labor and goods in those regions. The ongoing uncertainty and potential re-imposition of border controls and customs duties on trade between the United Kingdom and European Union nations could negatively impact our competitive position, merchant and customer relationships and financial performance. The ultimate effects of Brexit on us will depend on the specific terms of any agreement the United Kingdom and the European Union reach to provide access to each other’s respective markets.

Our future success depends upon our ability to attract and retain high quality merchants and third-party business partners.

We must continue to attract and retain high quality merchants in order to increase profitability. We depend on our ability to attract and retain merchants that are prepared to offer products or services on compelling terms through our marketplaces and provide our customers with a good experience. In most instances, we do not have long-term arrangements to guarantee the availability of deals that offer attractive quality, value and variety to customers or favorable payment terms to us. If merchants decide that utilizing our services no longer provides an effective means of attracting new customers or selling their goods and services, they may stop working with us or negotiate to pay us lower margins or fees. In addition, current or future competitors may accept lower margins, or negative margins, to secure merchants offers that attract attention and acquire new customers. If competitors engage in group buying initiatives in which merchants receive a higher portion of the purchase price than we currently offer, or if we target merchants who will only agree to run deals if they receive a higher portion of the proceeds, we may receive a lower portion of the gross billings on deals offered through our marketplaces. In addition, we may experience attrition in our merchants due to shifts in our business model and the way we pay merchants, and in the ordinary course of business resulting from several factors, including losses to competitors and merchant closures or merchant bankruptcies. If we are unable to attract and retain high quality merchants in numbers sufficient to grow our business, or if merchants are unwilling to offer products or services with compelling terms through our marketplaces or offer favorable payment terms to us, our operating results may be adversely affected.

Our business is exposed to risks associated with our voucherless offerings.

We are developing and scaling voucherless offerings, including offers that are linked to customer credit cards. Although we believe that voucherless offerings have the potential to increase customer purchase frequency and generate gross profit growth over the long term, there are no assurances that we will be able to scale our voucherless products or that our voucherless products will be successful in increasing customer purchase frequency or gross profit growth, if and when scaled. If we are unable to grow the number of and scale voucherless products in our marketplaces, our results of operations may be adversely affected. In addition, as we scale card-linked offerings, we may experience a short term negative impact to our financial performance.

In addition, we currently depend on third party business partners and technology integrations for many of our voucherless offerings. If we are unable to increase our third-party offerings or successfully complete the associated technology integrations, the quality of our supply and customer experience may be negatively impacted and decrease which could adversely affect our business operations and financial condition. Furthermore, our ability to offer card-linked offerings currently depends on our arrangements with card brand networks. In the event any card brand network no longer supports our card-linked offerings, imposes significant restrictions on our offerings or deal structures or significantly changes their fees, we may not be able to grow our card-linked offerings or such offerings may otherwise be unsuccessful, and our results of operations and financial condition could be adversely affected.

Further, most of our current card-linked offerings involve collecting fees from the merchant, rather than collecting payment from the customer and then remitting a portion of the proceeds to the merchant (as with the sale of vouchers). Accordingly, our gross billings are expected to be reduced if and when these card-linked offerings (or similarly structured products) become a larger portion of our overall product mix.

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We may be subject to breaches of our information technology systems, which could harm our relationships with our customers, merchants and third-party business partners, subject us to negative publicity and litigation, and cause substantial harm to our business or brand.

In operating a global online business, we and our third-party service providers maintain significant proprietary information and manage large amounts of personal data and confidential information about our employees, customers and merchants. We and such service providers are at constant risk of cyber-attacks or cyber intrusions via the Internet, computer viruses, break-ins, malware, phishing attacks, hacking, denial-of-service attacks or other attacks and similar disruptions from the unauthorized use of or access to computer systems (including from internal and external sources). These types of incidents have become more prevalent and pervasive across industries, including in our industry, and such attacks on our systems have occurred in the past and are expected to occur in the future. Further, we believe that we are a compelling target for such attacks as a result of the high profile of our brand and the amount and type of information we maintain relating to our customers and merchants. Any such incident could lead to interruptions, delays or website outages, causing loss of critical data or the unauthorized disclosure or use of personally identifiable or other confidential information.

Any failure to prevent or mitigate cybersecurity breaches or other improper access to, or disclosure of, our data or confidential information, including non-public financial information, could result in the loss or misuse of such data or information, negatively impacting customers’, merchants’ and third-party business partners' confidence in the security of our services and potentially resulting in significant customer or merchant attrition, a decline in customer purchase frequency, litigation and/or regulatory investigations, and/or damage to our brand and reputation.

Our risk and exposure to these matters remains heightened because of, among other things, the evolving nature of these threats, our prominent size and scale, the large number of transactions that we process, our geographic footprint and international presence, our use of open source software, the complexity of our systems, the maturity of our systems, processes and risk management framework, our number of employees, the location of our businesses and data storage facilities, the jurisdictions in which we operate and the various and evolving laws and regulatory schemes governing data and data protection applicable to us, the extent to which our current systems, controls, processes and practices permit us to detect, log and monitor security events, our use of cloud based technologies and the outsourcing of some of our business operations.

Although cybersecurity and the continued development and enhancement of our controls, processes and practices designed to protect our systems, computers, software, data and networks from attack, damage or unauthorized access are a high priority for us, our activities and investment may not be deployed quickly enough or successfully protect our systems against all vulnerabilities, including technologies developed to bypass our security measures or zero day vulnerabilities. In addition, outside parties may attempt to fraudulently induce employees, merchants or customers to disclose access credentials or other sensitive information in order to gain access to our systems and networks. We also may be subject to additional vulnerabilities as we integrate the systems, computers, software and data of acquired businesses and third-party business partners into our networks and separate the systems, computers, software and data of disposed businesses from our networks.

We maintain a cybersecurity risk management program that is overseen by our Vice President, Information Security, who reports directly to our Chief Technology Officer. Our Vice President, Information Security regularly reports to the Audit Committee on the state of our cybersecurity program and provides updates on cybersecurity matters. We also conduct an annual cybersecurity review with our Board of Directors. As part of our cybersecurity risk management program, we employ security practices to protect and maintain the systems located at our data centers and hosting providers, invest in intrusion, anomaly, and vulnerability detection tools and engage third-party security firms to test the security of our websites and systems. In addition, we regularly evaluate and assess our systems and the controls, processes and practices to protect those systems and also conduct penetration testing against our own system. The evaluations, assessments and testing identify areas of potential weakness in, and suggested improvements to, the maturity of our systems, processes, and risk management framework as well as vulnerabilities in those systems, processes, and risk management framework that could be attacked and exploited to access and acquire proprietary and confidential information, including information about our customers and merchants. There are no assurances that our cybersecurity risk mitigation program or actions and investments to improve the maturity of our systems, processes and risk management framework or remediate vulnerabilities will be sufficient or completed quickly enough to prevent or limit the impact of any cyber intrusion. In addition, in the future we may be required to expend significant additional resources to modify or enhance our protective measures, controls and systems or to improve the maturity of our systems, processes and risk management framework, or investigate or remediate any information security vulnerabilities. These improvements, modifications and enhancements may take significant time to implement. Further,

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the sophistication of potential attacks or the capabilities of our systems and processes may not permit us to detect the occurrence of cyber incidents until significant data loss has occurred. Moreover, because the techniques used to gain access to or sabotage systems often are not recognized until launched against a target, we may be unable to anticipate the methods necessary to defend against these types of attacks and we cannot predict the extent, frequency or impact these problems may have on us. Any actual breach, the perceived threat of a breach or a perceived breach, could cause our customers, merchants, card brands and payment card processors to cease doing business with us or do business with us less frequently, subject us to lawsuits (including claims for damages), investigations, regulatory fines or other action or liability or damage to our brand and reputation, which would harm our business, financial condition and results of operations.

We operate in a highly competitive industry with relatively low barriers to entry and must compete successfully in order to grow our business.

Competition in our industry may increase in future periods. A number of e-commerce sites that attempt to replicate our business model operate around the world. We also compete against companies that offer other types of advertising and promotional services to local businesses. In addition to such competitors, we may experience increased competition from other large businesses who offer deals similar to ours as an add-on to their core business. We also compete with other companies that offer digital coupons and/or card-linking services through their websites or mobile applications. Further, we compete against other e-commerce companies that serve niche markets and interests. In some of our categories, such as Goods and Travel, we compete against much larger companies who have more resources and significantly greater scale. In addition, we compete with traditional offline coupon and discount services, as well as newspapers, magazines and other traditional media companies who provide coupons and discounts on products and services.

We believe that our ability to compete successfully depends upon many factors both within and beyond our control, including the following:

• the size, composition and retention of our customer base and the number of merchants we feature;

• mobile penetration;

• understanding local business trends;

• ability to structure deals to generate positive return on investment for merchants;

• the timing and market acceptance of deals we offer, including the developments and enhancements to those deals offered by us or our competitors;

• customer and merchant service and support efforts;

• selling and marketing efforts;

• ease of use, performance, price and reliability of services offered either by us or our competitors;

• our ability to improve customer purchase frequency and customer lifetime value;

• our ability to drive organic traffic to our marketplaces;

• the number, quality and reliability of the digital coupons that can be accessed through our platform;

• the quality and performance of our merchants;

• our ability to cost-effectively manage our operations; and

• our reputation and brand strength relative to our competitors.

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Many of our current and potential competitors have longer operating histories, greater financial, marketing and other resources and larger customer bases than we do. These factors may allow our competitors to benefit from their existing customer base with lower customer acquisition costs or to respond more quickly than we can to new or emerging technologies and changes in consumer habits. In addition, our competitors may engage in more extensive research and development efforts, undertake more far-reaching marketing campaigns and adopt more aggressive pricing policies, which may allow them to build larger customer and/or merchant bases or generate revenue from their customer bases more effectively than we do. Our competitors may offer deals that are similar to the deals we offer or that achieve greater market acceptance than the deals we offer. This could attract customers away from our websites and mobile applications, reduce our market share and adversely impact our gross profit. In addition, we are dependent on some of our existing or potential competitors for display advertisements and other marketing initiatives to acquire new customers. Our ability to utilize their platforms to acquire new customers may be adversely affected if they choose to compete more directly with us or prevent us from using their services.

Our operating cash flow could be adversely impacted if we change our merchant payment terms.

Our merchant payment terms and revenue growth have historically provided us with operating cash flow to fund our working capital needs. Our merchant arrangements are generally structured such that we collect cash up front when our customers purchase vouchers or products on our website or mobile application and we make payments to merchants or suppliers at a subsequent date, either on a fixed schedule or upon redemption by customers. For our current card-linked offerings, we offer cash back on customers' credit card statements based on qualifying purchases with participating merchants. For those offerings, we remit payment to a card brand network at the time of the qualifying purchase for the customer’s cash back incentive and then we collect from the merchant both our commission and reimbursement for the customer’s cash back incentive, generally on a bi-weekly basis. The working capital impact of card-linked offerings is less favorable to us than traditional voucher transactions, for which we collect payment from customers at the time of sale and remit payment to merchants at a later date. We have used the operating cash flow provided by our merchant payment terms and revenue growth to fund our working capital needs. If we offer merchants more favorable or accelerated payment terms and/or significantly grow our card-linked offerings, our operating cash flow could be adversely impacted and we may have to seek alternative financing to fund our working capital needs.

Our success is dependent upon our ability to provide a superior mobile experience for our customers and our customers' continued ability to access our offerings through mobile devices.

In the year ended December 31, 2018, over 70% of our global transactions were completed on mobile devices. Additionally, our mobile application has been downloaded over 195 million times as of December 31, 2018. While the focus on mobile is key to our long-term strategy, currently average purchase prices and conversion rates on mobile tend to be significantly lower than desktop. In order to continue to grow our mobile transactions and improve mobile conversion rates, it is critical that our applications are compatible with a range of mobile technologies, systems, networks and standards and that we provide a good customer experience. Further, as part of our strategy, we have been developing and testing a number of product enhancements that are intended to make our offerings easier to use for both customers and merchants, including voucherless offerings. We also are working on a next-generation mobile application that we expect to test during 2019. Our business may be adversely affected if our customers choose not to access our offerings on their mobile devices or use mobile devices that do not offer access to our mobile applications, we are not successful in increasing mobile conversion rates or if we fail to develop applications and product enhancements with adequate functionality and a positive customer experience on a wide range of mobile devices.

Our business depends on our ability to maintain and improve the technology infrastructure necessary to send our emails and operate our websites, mobile applications and transaction processing systems, and any significant disruption in service on our email network infrastructure, websites, mobile applications or transaction processing systems could result in a loss of customers or merchants.

Customers access our marketplaces through our websites and mobile applications, as well as via emails that are often targeted by location, purchase history and personal preferences. Customers can also access our deal offerings indirectly through third-party search engines. Our reputation and ability to acquire, retain and serve our current and potential customers are dependent upon the reliable performance of our websites, mobile applications, email delivery and transaction processing systems and the underlying network infrastructure. Our systems may not be adequately designed with the necessary reliability and redundancy to avoid performance delays or outages that could be prolonged and harmful to our business. If our websites or mobile applications are unavailable when users attempt to access them, or if they do not load as quickly as expected, users may not return as often in the future, or at all. As our customer

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base and the amount of information shared on our websites and mobile applications continue to grow, we will need an increasing amount of network capacity and computing power. We have spent and expect to continue to spend substantial amounts on data centers and equipment, cloud-based technology and related network infrastructure and services to handle the traffic on our websites and mobile applications and to help shorten the time of or prevent system interruptions. The operation of these systems is expensive and complex and could result in operational failures. While resiliency and redundancy are considerations in the design and operation of Groupon's systems, interruptions, delays or failures in these systems, whether due to earthquakes, adverse weather conditions, other natural disasters, power loss, computer viruses, cybersecurity attacks, physical break-ins, terrorism, errors in our software or otherwise, could be prolonged and could affect the security or availability of our websites and applications, and prevent our customers from accessing our services. If we do not maintain or expand our network infrastructure successfully or if we experience operational failures or prolonged disruptions or delays in the availability of our systems or a significant search engine, we could lose current and potential customers and merchants, which could harm our operating results and financial condition.

In addition, a portion of our network infrastructure is hosted by third-party providers. We also rely on a variety of tools and third-party commercial partners to provide certain services and offerings (e.g., booking and ticketing tools). Any disruption or failure of these providers, tools and/or other third parties to handle existing or increased traffic and transactions could significantly harm our business. Any financial or other difficulties these providers face may adversely affect our business, and we exercise little control over these providers, which increases our vulnerability to problems with the services they provide.

If our emails are not delivered and accepted, or are routed by email providers less favorably than other emails, or our sites or mobile applications are not accessible, or are treated disadvantageously by Internet service providers or other third-parties, our business may be substantially harmed.

If email providers or Internet service providers ("ISPs") implement new or more restrictive email or content delivery or accessibility policies, including with respect to net neutrality, it may become more difficult to deliver emails to our customers or for customers to access our site and services. For example, certain email providers, including Google, categorize our emails as "promotional," and these emails are directed to an alternate, and less readily accessible, section of a customer's inbox. If email providers materially limit or halt the delivery of our emails, or if we fail to deliver emails to customers in a manner compatible with email providers’ email handling or authentication technologies, our ability to contact customers through email could be significantly restricted. In addition, if we are placed on "spam" lists or lists of entities that have been involved in sending unwanted, unsolicited emails, our operating results and financial condition could be substantially harmed. Further, if ISPs prioritize or provide superior access to our competitors' content or if there are changes to search engine algorithms or similar actions that adversely affect traffic to our websites and mobile applications, our business and results of operations may be negatively impacted.

We purchase and sell some products from indirect suppliers and allow third parties to sell products via our site and services, which increase our risk of litigation and other losses.

We source merchandise both directly from brand owners and indirectly from retailers and third-party distributors, and we often take title to the goods before we offer them for sale to our customers. Further, some brand owners, retailers and third- party distributors may be unwilling to offer products for sale on the Internet or through Groupon in particular, which could have an adverse impact on our ability to source and offer popular products. We also allow third party merchants to sell products to our customers via our marketplace platform. By selling merchandise sourced from parties other than the brand owners, and allowing the sale of merchandise by third parties, we are subject to an increased risk that the merchandise may be damaged or of disputed authenticity, which could result in potential liability under applicable laws, regulations, agreements and orders, and increase the amount of returned merchandise or customer refunds. In addition, brand owners or regulators may take legal action against us. Even if we prevail, any such legal action could result in costly litigation, generate adverse publicity for us, and have a material adverse impact on our business, financial condition, results of operations, brand and reputation. Further, in any such matter, we may not be entitled to indemnification from our supplier or merchant, or able to effectively enforce the supplier’s or merchant’s contractual indemnification obligations.

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We may be subject to substantial liability claims and damage to our brand and reputation if people or property are harmed by the products or services offered through our marketplace.

Some of the products and services offered through our marketplace may expose us to liability claims relating to personal injury, death, negligence, intentional misconduct, assault, abuse or environmental or property damage. Certain merchants and third parties sell products and offer services using our marketplace that based on the type of product or service, may increase our exposure to substantial claims and litigation, especially if these merchants or third-party sellers do not have sufficient protection from such claims. Although we believe we are not liable for the goods or services that merchants or third-parties offer through our marketplace, there is no assurance that a court would rule in our favor on such issues. Further, while we maintain liability insurance, we cannot be certain our coverage will apply to the claims at issue, be adequate for liabilities actually incurred or that insurance will continue to be available to us on economically reasonable terms, or at all. In addition, some of our agreements with vendors, merchants and third-party sellers do not indemnify us from certain liability and costs or we may not be able to effectively enforce our contractual indemnification rights. Claims relating to products or services offered through our marketplace also could result in significant damage to our brand and reputation regardless of whether we are ultimately liable for any such claims.

Our processes and procedures for onboarding merchants and third-party sellers also may expose us to liability claims or damage to our brand and reputation if the processes or procedures are deemed inadequate. Additionally, while we maintain multiple channels through which our customers can submit feedback or complaints about their experiences with merchants and other third-party sellers on our platform, because our customers often deal directly with the sellers, pertinent feedback may not be provided to us. Moreover, our evaluation of any customer feedback or complaints we receive is subjective based on the information, which is sometimes very limited, that our customers provide, and we may not take action in response to feedback or complaints. If our systems and procedures with respect to any such feedback or complaints are determined to be inadequate or any action or inaction is found to be inadequate, including, by way of example, not discontinuing on a timely basis offers of deals with merchants or sellers that have been the subject of material complaints, we could face substantial additional liability and damage to our brand and reputation for the misconduct of such merchants or third-party sellers.

We are subject to inventory management and order fulfillment risks as a result of our Goods category.

We purchase a portion of the merchandise that we offer for sale to our customers. The demand for products can change for a variety of reasons, including customer preference, quality, seasonality, and customers' perception of the value of purchasing the product through us. If we or our third-party suppliers are unable to adequately predict customer demand and efficiently manage inventory, we could have either an excess or a shortage of inventory, either of which would adversely impact our business.

It is important that we fulfill orders on a timely, efficient and cost-effective basis. Many other online retailers have significantly larger inventory balances and therefore are able to rely on past experience and economies of scale to optimize their order fulfillment. Because we rely on third-party logistics providers and third-party sellers for much of our order fulfillment and delivery, many parts of the supply chain are outside our control. Delays or inefficiencies in our processes, or those of our third-party logistics providers or third-party sellers, could subject us to additional costs, as well as customer dissatisfaction, which would adversely affect our business. Additionally, in some cases we assume the risks of inventory damage, theft and obsolescence, as well as risks of price erosion for these products. These risks are especially significant because some of the merchandise we sell is characterized by seasonal trends, fashion trends, obsolescence and price erosion and because we sometimes make large purchases of particular types of inventory. Our success will depend on our ability to sell our inventory rapidly, the ability of our buying staff to purchase inventory at attractive prices relative to its resale value and our ability to manage customer returns and other costs. If we are unsuccessful in any of these areas, we may be forced to sell our inventory at a discount or loss.

We are involved in pending litigation and an adverse resolution of such litigation may adversely affect our business, financial condition, results of operations and cash flows.

We are involved from time to time in litigation regarding, among other matters, patent, consumer, privacy and employment issues. Litigation can be expensive, time-consuming and disruptive to normal business operations. The results of complex legal proceedings are often uncertain and difficult to predict. An unfavorable outcome with respect to any of these lawsuits could have a material adverse effect on our business, financial condition, results of operations

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and cash flows. For additional information regarding these and other lawsuits in which we are involved, see Item 8, Note 10, Commitments and Contingencies, to the consolidated financial statements.

An increase in our refund rates or estimated liabilities with respect to unredeemed vouchers could adversely affect our profitability or net income.

As we expand our product offerings, our customer refund rates may exceed historical levels. A downturn in general economic conditions may also increase our refund rates. An increase in our refund rates could significantly reduce our liquidity and profitability. We estimate future refunds utilizing a statistical model that incorporates historical refund experience, including the relative risk of refunds based on deal category. Our actual level of refund claims could prove to be greater than the level of refund claims we estimate. If our refund reserves are not adequate to cover future refund claims, this inadequacy could have a material adverse effect on our profitability. In addition, we may not be able to obtain reimbursement from merchants for refunds that we issue, which could have an adverse effect on our liquidity and profitability.

In recent periods, we have increased our use of redemption payment terms with our North America merchants. In addition, the revenue recognition standard that we adopted in 2018 requires us to estimate variable consideration from unredeemed vouchers. As a result, a greater percentage of our transactions in North America than in prior periods will require us to use projections in order to estimate revenue and liabilities associated with unredeemed vouchers. If the estimates that we use in projecting the likelihood of vouchers being redeemed prove to be inaccurate, our liabilities with respect to unredeemed vouchers may be materially higher than the amounts shown in our financial statements, and our net income could be materially and adversely affected.

The loss of one or more key members of our management team, or our failure to attract and retain other highly qualified personnel in the future could harm our business.

In order to be successful, we must attract, retain and motivate executives and other key employees, including those in managerial, technical and sales positions. Hiring and retaining qualified executives, engineers and qualified sales representatives are critical to our success, and competition for experienced and well qualified employees can be intense. In order to attract and retain executives and other key employees in a competitive marketplace, we must provide a competitive compensation package, including cash and share-based compensation. We currently utilize restricted stock units and performance share units as our forms of share-based incentive compensation. If the anticipated value of such share-based incentive awards does not materialize, if our share-based compensation otherwise ceases to be viewed as a valuable benefit or if our total compensation package is not viewed as competitive, our ability to attract, retain and motivate executives and key employees could be weakened. The failure to successfully hire executives and key employees or the loss of any executives and key employees could have a significant impact on our operations.

Acquisitions, dispositions, joint ventures and strategic investments could result in operating difficulties, dilution and other consequences.

We routinely evaluate and consider a wide array of potential strategic transactions, including acquisitions and dispositions of businesses, joint ventures, technologies, services, products and other assets and minority investments. The pursuit and consummation of such transactions can result in operating difficulties, dilution, management distraction and other potentially adverse consequences. In the past, we have acquired and divested a number of companies and may complete additional transactions in the future.

Acquisitions involve significant risks and uncertainties, including uncertainties as to the future financial performance of the acquired business and the performance of acquired customers, valuation of the acquired business and integration risks such as difficulties integrating acquired personnel into our business, the potential loss of key employees, customers or suppliers, difficulties in integrating different computer, payment and accounting systems and exposure to unknown or unforeseen liabilities of acquired companies. In addition, the integration of an acquisition could divert management's time and our resources. If we pay for an acquisition or a minority investment in cash, it would reduce our cash available for operations or cause us to incur debt, and if we pay with our stock it could be dilutive to our stockholders. Additionally, we do not have the ability to exert control over our minority investments, and therefore we are dependent on others in order to realize their potential benefits. Dispositions and attempted dispositions also involve significant risks and uncertainties, such as the risk of destabilizing the applicable operations, the loss of key personnel, the terms and timing of any dispositions, the ability to obtain necessary governmental or regulatory approvals, post-disposal disputes and indemnification obligations and risks and uncertainties with respect to the

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separation of disposed operations, including, for example, transition services, access by purchasers to certain of our systems and tools during transition periods, the migration of data and separation of systems, data privacy matters and misuse of trademarks and intellectual property. We may be unable to successfully complete potential strategic transactions or dispositions on a timely basis or at all, or we may not realize the anticipated benefits of any of our strategic transactions in the time frame expected or at all.

We do not have the ability to exert control over our minority investments, and therefore we are dependent on others in order to realize their potential benefits.

We currently hold non-controlling minority investments in Monster Holdings LP ("Monster LP") and other entities and we may make additional strategic minority investments in the future. Such minority investments inherently involve a lesser degree of control over business operations, thereby potentially increasing the financial, legal, operational and/or compliance risks associated with the investments. Other investors in these entities may have business goals and interests that are not aligned with ours, or may exercise their rights in a manner in which we do not approve. These circumstances could lead to delayed decisions or disputes and litigation with those other investors, all of which could have a material adverse impact on our reputation, business, financial condition and results of operations.

If Monster LP or other investees seek additional financing in order to fund their growth strategies, such financing transactions may result in further dilution of our ownership stakes and such transactions have and in the future may occur at lower valuations than the investment transactions through which we acquired such interests, which could significantly decrease the fair values of our investments in those entities. Additionally, if Monster LP or other investees are unable to obtain any such financing, those entities could need to significantly reduce their spending in order to fund their operations. Such actions likely would result in reduced growth forecasts, which also could significantly decrease the fair values of our investments in those entities.

The application of certain laws and regulations, including, among other laws, the CARD Act and similar state and foreign laws, may harm our business and results of operations.

The application of certain laws and regulations to vouchers is uncertain. Vouchers may be considered gift cards, gift certificates, stored value cards or prepaid cards and therefore governed by, among other laws, the CARD Act, and state laws governing gift cards, stored value cards and coupons, and, in certain instances, potentially subject to unclaimed and abandoned property laws. Other foreign jurisdictions have similar laws in place, in particular European jurisdictions where the European E-Money Directive regulates the business of electronic money institutions. Many of these laws contain provisions governing the use of gift cards, gift certificates, stored value cards or prepaid cards, including specific disclosure requirements and prohibitions or limitations on the use of expiration dates and the imposition of certain fees. For example, if vouchers are subject to the CARD Act and are not included in the exemption for promotional programs, it is possible that the purchase value, which is the amount equal to the price paid for the voucher, or the promotional value, which is the add-on value of the voucher in excess of the price paid, or both, may not expire before the later of (i) five years after the date on which the voucher was issued; (ii) the voucher’s stated expiration date (if any); or (iii) a later date provided by applicable state law. In the event that it is determined that vouchers sold through our platform are subject to the CARD Act or any similar state or foreign law or regulation, and are not within various exemptions that may be available under the CARD Act or under some of the various state or foreign jurisdictions, our liabilities with respect to unredeemed vouchers may be materially higher than the amounts shown in our financial statements and we may be subject to additional fines and penalties.

In addition, from time to time, we may be notified of additional laws, or developments in existing, laws and regulations that governmental organizations or others may claim should be applicable to our business, or that otherwise affect our operations. If we are required to alter our business practices, or there are other market changes, as a result of any laws and regulations, our revenue could decrease, our costs could increase and our business could otherwise be harmed. In addition, the costs and expenses associated with defending any actions related to, or otherwise reacting to, such legal or regulatory developments, and any related payments (including penalties, judgments, settlements or fees) could adversely impact our profitability. To the extent that we expand into new lines of business and new geographies, we will become subject to additional laws and regulations.

We may have exposure to greater than anticipated tax liabilities.

We are subject to income taxes in the United States (federal and state) and numerous foreign jurisdictions. Tax laws, regulations, and administrative practices in various jurisdictions may be subject to significant change due to economic, political, and other conditions, and significant judgment is required in evaluating and estimating our provision

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and accruals for these taxes. Our income tax obligations are based on our corporate operating structure, including the manner in which we develop, value and use our intellectual property and the scope of our international operations.

The tax laws applicable to our domestic and international business activities, including the laws of the United States and other jurisdictions, are subject to interpretation. The taxing authorities of the jurisdictions in which we operate may challenge our methodologies for valuing developed technology or intercompany arrangements, which could potentially increase our worldwide effective tax rate and harm our financial position and results of operations. In addition, there are many transactions that occur during the ordinary course of business for which the ultimate tax determination is uncertain. Our effective tax rates could be adversely affected by earnings being lower than anticipated in jurisdictions where we have lower statutory rates and higher than anticipated in jurisdictions where we have higher statutory rates, losses incurred in jurisdictions for which we are not able to realize the related tax benefits, changes in foreign currency exchange rates, entry into new businesses and geographies and changes to our existing businesses, acquisitions and investments, changes in our deferred tax assets and liabilities and their valuation and changes in the relevant tax, accounting and other laws, regulations, administrative practices, principles and interpretations, including fundamental changes to the tax laws applicable to corporate multinationals. Developments in an audit, litigation or the relevant laws, regulations, administrative practices, principles and interpretations could have a material effect on our financial position, operating results and cash flows in the period or periods for which that development occurs, as well as for prior and subsequent periods.

We also are subject to regular review and audit by both U.S. federal and state and foreign tax authorities. In particular, we currently are, and expect to continue to be, subject to numerous federal, state and international tax audits relating to income, transfer pricing, sales, VAT and other tax liabilities. Some of these pending and future audits could involve significant liabilities and/or penalties. We are subject to claims for tax assessments by foreign jurisdictions, including a proposed assessment for $109.6 million. We believe that the assessment, which primarily relates to transfer pricing on transactions occurring in 2011, is without merit and we intend to vigorously defend ourselves in that matter. See Item 8, Note 15, Income Taxes, for additional information. Any adverse outcome of such a review or audit could have a significant negative effect on our financial position and results of operations. In addition, the determination of our worldwide provision for income taxes and other tax liabilities requires significant judgment by management, and there are many transactions where the ultimate tax determination is uncertain. Although we believe that our estimates are reasonable, the ultimate tax outcome may differ from the amounts recorded in our financial statements and may materially affect our financial results in the period or periods for which such determination is made.

The adoption of tax reform policies, including the enactment of legislation or regulations implementing changes in the tax treatment of companies engaged in Internet commerce or the U.S. taxation of international business activities could materially affect our financial position and results of operations.

Further, due to the global nature of the Internet, it is possible that various states or foreign countries might attempt to regulate our transmissions or levy sales, income or other taxes relating to our activities. Tax authorities at the international, federal, state and local levels are currently reviewing the appropriate treatment of companies engaged in Internet commerce. New or revised international, federal, state or local tax regulations may subject us or our customers to additional sales, income and other taxes. We cannot predict the effect of current attempts to impose sales, income or other taxes on commerce over the Internet. New or revised taxes and, in particular, sales taxes, VAT and similar taxes, including digital service taxes, would likely increase the cost of doing business online and decrease the attractiveness of advertising and selling goods and services over the Internet. For example, the voucher directive recently adopted by the European Union or similar regulations could adversely affect our financial results. New taxes could also create significant increases in internal costs necessary to capture data, and collect and remit taxes. Any of these events could have an adverse effect on our business and results of operations.

On December 22, 2017, new legislation was signed into law that revises the Internal Revenue Code of 1986, as amended. The newly enacted federal income tax law contains significant changes to corporate taxation. Although we currently do not expect the new federal tax law to have a significant impact on us, the overall impact over time is uncertain as the law is interpreted and implemented. In addition, it is uncertain if and to what extent various states will conform to the newly enacted federal tax law.

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If we are required to materially increase the liability recorded in our financial statements with respect to unredeemed vouchers our results of operations could be materially and adversely affected.

In certain states and foreign jurisdictions, vouchers may be considered a gift card. Some of these states and foreign jurisdictions include gift cards under their unclaimed and abandoned property laws which require companies to remit to the government the full value or a portion of the value of the unredeemed balance on the gift cards after a specified period of time (generally between one and five years) and impose certain reporting and record-keeping obligations. We do not remit any amounts relating to unredeemed vouchers based on our assessment of applicable laws. The analysis of the potential application of the unclaimed and abandoned property laws to vouchers is complex, involving an analysis of constitutional and statutory provisions and factual issues, including our contractual relationship with customers and merchants. In recent periods, we increased our use of redemption payment terms with our North America merchants, and we expect that trend to continue. The determinations we make with respect to variable consideration that we earn on those transactions may be subject to the laws described above, and we expect the amount of that variable consideration to increase as our use of redemption payment terms increases. In the event that one or more states or foreign jurisdictions successfully challenges our position on the application of its unclaimed and abandoned property laws to vouchers, our liabilities with respect to unredeemed vouchers, including any resulting penalties and interest, may be materially higher than the amounts shown in our financial statements which could have a material adverse impact on our results of operations.

Government regulation of the Internet and e-commerce is evolving, and unfavorable changes or failure by us to comply with these regulations could substantially harm our business and results of operations.

We are subject to general business regulations and laws as well as regulations and laws specifically governing the Internet and e-commerce. Existing and future regulations and laws could impede the growth of the Internet or other online services. These regulations and laws may involve taxation, tariffs, subscriber privacy, anti-spam, data protection, content, reference pricing, copyrights, distribution, electronic contracts and other communications, consumer protection, the provision of online payment services and the characteristics and quality of services. The application of existing laws governing issues such as property ownership, sales and other taxes, libel and personal privacy to the Internet is not clear as the vast majority of these laws were adopted prior to the advent and do not contemplate or address the unique issues raised by the Internet or e-commerce. In addition, it is possible that governments of one or more countries may seek to censor content available on our websites and mobile applications or may even attempt to completely block our emails or access to our websites. Adverse legal or regulatory developments could substantially harm our business. In particular, in the event that we are restricted, in whole or in part, from operating in one or more countries, our ability to retain or increase our customer base may be adversely affected and we may not be able to maintain or grow our gross profit as anticipated.

Failure to comply with federal, state and international privacy laws and regulations, or the expansion of current or the enactment of new privacy laws or regulations, could adversely affect our business.

A variety of federal, state and international laws and regulations govern the collection, use, retention, sharing and security of consumer data. The existing privacy-related laws and regulations are evolving and subject to potentially differing interpretations. In addition, various federal, state and foreign legislative and regulatory bodies may expand current or enact new laws regarding privacy matters. For example, the European Union adopted the GDPR, which became effective in May 2018, and requires companies to satisfy new requirements regarding the handling of personal and sensitive data, including its collection, use, protection and the ability of persons whose data is stored to correct or delete such data about themselves. In addition, the State of California adopted the California Consumer Protection Act of 2018 ("CCPA"), which will become effective in 2020 and also will regulate the collection and use of consumers' data. Complying with the GDPR, CCPA and similar laws and regulations may cause us to incur substantial operational costs or require us to change our business practices. Further, despite our diligent efforts to comply with these laws and regulations, we may not be successful either due to internal or external factors such as resource allocation limitations or a lack of vendor cooperation. Noncompliance could result in proceedings against us by governmental entities or others and fines. For example, fines under GDPR could be up to the greater of €20 million or 4% of annual global revenue and damage our reputation and brand. As a result of GDPR, in particular, we may also experience difficulty retaining or obtaining new European or multi-national customers due to the compliance cost, potential risk exposure, portability of customer data and uncertainty for these entities. We also may find it necessary to establish systems to maintain personal data originating from the European Union in the European Economic Area as a result

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of changes or restrictions to currently legitimate methods of effectuating cross-border personal data transfers to countries outside of the European Economic Area, which may involve substantial expense and distraction from other aspects of our business. Additionally, there could be uncertainty as to how to comply with privacy laws, in various jurisdictions such as country or state-specific laws that may conflict with or deviate from privacy directives, such as GDPR, CCPA or future laws and regulations.

We have posted privacy policies and practices concerning the collection, use and disclosure of subscriber data on our websites and applications. Several Internet companies have incurred substantial penalties for failing to abide by the representations made in their privacy policies and practices. In addition, several states have adopted legislation that requires businesses to implement and maintain reasonable security procedures and practices to protect sensitive personal information and to provide notice to consumers in the event of a security breach resulting in a loss or likely loss of personal information. Any failure, or perceived failure, by us to comply with our posted privacy policies or with any data-related consent orders, Federal Trade Commission requirements or orders or other federal, state or international privacy or consumer protection-related laws, regulations or industry self-regulatory principles could result in claims, proceedings or actions against us by governmental entities or other third-parties or other liabilities, which could adversely affect our business. In addition, a failure or perceived failure to comply with industry standards or with our own privacy policies and practices could result in a loss of subscribers or merchants and adversely affect our business. Federal, state and international governmental authorities continue to evaluate the privacy implications inherent in the use of third-party web "cookies" for tracking and behavioral advertising. The regulation of these cookies and other current online advertising practices could adversely affect our business.

Misclassification or reclassification of our independent contractors or employees could increase our costs and adversely impact our business.

Our workers are classified as either employees or independent contractors, and if employees, as either exempt from overtime or non-exempt (and therefore overtime eligible). Regulatory authorities and private parties have recently asserted within several industries that some independent contractors should be classified as employees and that some exempt employees, including those in sales-related positions, should be classified as non-exempt based upon the applicable facts and circumstances and their interpretations of existing rules and regulations. If we are found to have misclassified employees as independent contractors or non-exempt employees as exempt, we could face penalties and have additional exposure under federal and state tax, workers’ compensation, unemployment benefits, labor, employment and tort laws, including for prior periods, as well as potential liability for employee overtime and benefits and tax withholdings. Legislative, judicial, or regulatory (including tax) authorities could also introduce proposals or assert interpretations of existing rules and regulations that would change the classification of a significant number of independent contractors doing business with us from independent contractor to employee and a significant number of exempt employees to non-exempt. A reclassification in either case could result in a significant increase in employment-related costs such as wages, benefits and taxes. The costs associated with employee classification, including any related regulatory action or litigation, could have a material adverse effect on our results of operations and our financial position.

We may suffer liability as a result of information or content retrieved from or transmitted over the Internet and claims related to our service offerings.

We may be, and in certain cases have been, sued for defamation, civil rights infringement, negligence, patent, copyright or trademark infringement, invasion of privacy, personal injury, product liability, breach of contract, unfair competition, discrimination, antitrust reference pricing or other legal claims relating to information or content that is published or made available on our websites or service offerings we make available (including provision of an application programming interface platform for third parties to access our website, mobile device services and geolocation applications). This risk is enhanced in certain jurisdictions outside the United States, where our liability for such third-party actions may be less clear and we may be less protected. In addition, we could incur significant costs in investigating and defending such claims, even if we ultimately are not found liable. If any of these events occurs, our business could be materially and adversely affected.

We are subject to risks associated with information disseminated through our websites and mobile applications, including consumer data, content that is produced by our editorial staff and errors or omissions related to the offerings on our marketplaces. Such information, whether accurate or inaccurate, may result in our being sued by our merchants, subscribers or third parties and as a result our results of operations and our financial position could be materially and adversely affected.

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We may not be able to adequately protect our intellectual property rights or may be accused of infringing intellectual property rights of third parties.

We regard our trademarks, service marks, copyrights, patents, trade dress, trade secrets, proprietary technology, merchant lists, subscriber lists, sales methodology and similar intellectual property as critical to our success, and we rely on trademark, copyright and patent law, trade secret protection and confidentiality and/or license agreements with our employees and others to protect our proprietary rights. Effective intellectual property protection may not be available in every country in which our deals are made available. We also may not be able to acquire or maintain appropriate domain names or trademarks in all countries in which we do business. Furthermore, regulations governing domain names may not protect our trademarks and similar proprietary rights. We may be unable to prevent third parties from acquiring and using domain names or trade names that are similar to, infringe upon or diminish the value of our trademarks and other proprietary rights. We may be unable to prevent third parties from using and registering our trademarks, or trademarks that are similar to, or diminish the value of, our trademarks in some countries.

We may not be able to discover or determine the extent of any unauthorized use of our proprietary rights. Third parties that license our intellectual property rights also may take actions that diminish the value of our proprietary rights or reputation. The protection of our intellectual property may require the expenditure of significant financial and managerial resources. Moreover, the steps we take to protect our intellectual property may not adequately protect our rights or prevent third parties from infringing or misappropriating our proprietary rights. We are currently subject to multiple lawsuits and disputes related to our intellectual property and service offerings. We may in the future be subject to additional litigation and disputes. The costs of engaging in such litigation and disputes are considerable, and there can be no assurances that favorable outcomes will be obtained.

We are currently subject to third-party claims that we infringe upon proprietary rights or trademarks and expect to be subject to additional claims in the future. Such claims, whether or not meritorious, may result in the expenditure of significant financial and managerial resources, injunctions against us or the payment of damages by us. We may need to obtain licenses from third parties who allege that we have infringed their rights, but such licenses may not be available on terms acceptable to us or at all. These risks have been amplified by the increase in third parties whose sole or primary business is to assert such claims.

Our business depends on a strong brand, and if we are not able to maintain and enhance our brand, our ability to expand our base of customers and merchants could be impaired and our business and operating results could be harmed.

We believe that the brand identity that we have developed has significantly contributed to the success of our business. We also believe that maintaining and enhancing the "Groupon" brand is critical to expanding our base of customers and merchants. Maintaining and enhancing our brand may require us to make substantial investments and these investments may not be successful. If we fail to promote, maintain and protect the "Groupon" brand, or if we incur excessive expenses in this effort, our business, operating results and financial condition will be materially and adversely affected. We anticipate that, as our market becomes increasingly competitive, maintaining and enhancing our brand may become increasingly difficult and expensive. Maintaining and enhancing our brand will depend largely on our ability to continue to provide reliable, trustworthy and high quality offerings on our online marketplaces, which we may not do successfully.

We receive a high degree of media coverage around the world. Unfavorable publicity or consumer perception of our websites, mobile applications, practices or service offerings, or the offerings of our merchants or their products, could adversely affect our reputation, resulting in difficulties in recruiting, decreased revenue and a negative impact on the number of merchants we feature and the size of our customer base, the loyalty of our customers and the number and variety of deals we offer each day. As a result, our business, financial condition and results of operations could be materially and adversely affected.

Failure to deal effectively with fraudulent transactions and customer disputes would increase our loss rate and harm our business.

Groupon vouchers are issued in the form of redeemable vouchers with unique identifiers. It is possible that consumers or other third parties will seek to create counterfeit vouchers in order to fraudulently purchase discounted goods and services from merchants. While we use advanced anti-fraud technologies, criminals may attempt to circumvent our anti-fraud systems using increasingly sophisticated methods. In addition, our service could be subject to employee fraud or other internal security breaches, and we may be required to reimburse customers and/or merchants

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for any funds stolen or revenue lost as a result of such breaches. If merchants are affected by buyer fraud or other types of fraud, they could also request reimbursement, or stop offering goods or services on our marketplaces.

Although we have not incurred significant losses from fraud and counterfeit vouchers in the past, we could incur significant losses from such activities in future periods. Additionally, we may incur losses from claims that the customer did not authorize a purchase, from credit card fraud, from merchant fraud, from erroneous transmissions, and from customers who have closed bank accounts or have insufficient funds in them to satisfy payments. We also may incur losses as a result of purchases made with fraudulent credit card information, even if the associated financial institution approved payment of the transaction. In addition to the direct costs of any such losses, if the losses are related to credit card transactions and become excessive, they could potentially result in our losing the right to accept credit cards for payment. If we were unable to accept credit cards for payment, we would suffer substantial reductions in revenue, which would cause our business to suffer. While we have taken measures to detect and reduce the risk of fraud, these measures need continual improvement and may not be effective against new and continually evolving forms of fraud or in connection with new product offerings. If we are unable to effectively combat the use of fraudulent credit cards on our websites or if we otherwise experience increased levels of fraud or disputed credit card payments, our business could materially suffer.

We are subject to payments-related risks.

We accept payments using a variety of methods, including credit cards, debit cards and gift certificates. As we offer new payment options to customers, we may be subject to additional regulations, compliance requirements and fraud. For certain payment methods, including credit and debit cards, we pay interchange and other fees, which may increase over time and raise our operating costs and lower profitability. In addition, our credit card and other payment processors could impose receivable holdback or reserve requirements in the future, which could have a material impact on our cash flow and available liquidity. We rely on third parties to provide payment processing services, including the processing of credit cards and debit cards, and it could disrupt our business if these companies become unwilling or unable to provide these services to us. We are also subject to payment card association operating rules, certification requirements and rules governing electronic funds transfers, which could change or be reinterpreted to make it difficult or impossible for us to comply. If we fail to comply with these rules or requirements, we may be subject to fines and higher transaction fees and lose our ability to accept credit and debit card payments from customers or facilitate other types of online payments, and our business and operating results could be adversely affected.

We are also subject to or voluntarily comply with a number of other laws and regulations relating to money laundering, international money transfers, privacy and information security and electronic fund transfers. If we were found to be in violation of applicable laws or regulations, we could be subject to civil and criminal penalties. In addition, events affecting our third-party payment processors or our integration with them, including cyber-attacks, Internet or other infrastructure or communications impairment or other events that could interrupt the normal operation of our payment processors or our integration with them, or result in unauthorized access to customer information, could have a material adverse effect on our business.

Federal laws and regulations, such as the Bank Secrecy Act and the USA PATRIOT Act and similar foreign laws, could be expanded to include Groupon vouchers or other offerings.

Various federal laws, such as the Bank Secrecy Act and the USA PATRIOT Act and foreign laws and regulations, such as the European Directive on the prevention of the use of the financial system for the purpose of money laundering and terrorist financing, impose certain anti-money laundering requirements on companies that are financial institutions or that provide financial products and services. For these purposes, financial institutions are broadly defined to include money services businesses such as money transmitters, check cashers and sellers or issuers of stored value cards. Examples of anti-money laundering requirements imposed on financial institutions include subscriber identification and verification programs, record retention policies and procedures and transaction reporting. We do not believe that we are a financial institution subject to these laws and regulations based, in part, upon the characteristics of Groupon vouchers and our role with respect to the distribution of Groupon vouchers to customers. For example, the Financial Crimes Enforcement Network ("FinCEN"), a division of the U.S. Treasury Department tasked with implementing the requirements of the Bank Secrecy Act (the "BSA"), has adopted regulations expanding the scope of the BSA and requirements for parties involved in stored value or prepaid access cards, including a proposed expansion of financial institutions to include sellers or issuers of prepaid access cards. While we believe Groupon vouchers are not subject to these regulations, it is possible that FinCEN or a court of law could consider Groupon vouchers (or other Groupon products) a financial product and that we could be a financial institution. In the event that we become subject to the requirements of the Bank Secrecy Act or any other anti-money laundering law or regulation imposing obligations on

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us as a money services business, our regulatory compliance costs to meet these obligations would likely increase which could adversely impact our operating results.

State and foreign laws regulating money transmission could be expanded to include Groupon vouchers or other Groupon products or services.

Many states and certain foreign jurisdictions impose license and registration obligations on those companies engaged in the business of money transmission, with varying definitions of what constitutes money transmission. We currently believe that we are not a money transmitter given our role and the product terms of Groupon vouchers or other Groupon products or services. However, a successful challenge to our position or expansion of state or foreign laws could subject us to increased compliance costs and delay our ability to offer Groupon vouchers or other products or services in certain jurisdictions pending receipt of any necessary licenses or registrations.

Our ability to raise capital in the future may be limited, which could prevent us from growing, and our existing credit agreement could restrict our business activities.

We may in the future be required to raise capital through public or private financing or other arrangements. Such financing may not be available on acceptable terms, or at all, and our failure to raise capital when needed could harm our business. In addition, we are party to a $250.0 million amended and restated credit agreement with JPMorgan Chase Bank, N.A., as Administrative Agent, dated as of June 29, 2016, as amended (the "Credit Agreement"), which matures in June 2019. We intend to refinance our Credit Agreement during the first half of 2019. Our Credit Agreement contains financial and other covenants that may restrict our business activities or our ability to execute our strategic objectives, and our failure to comply with these covenants could result in a default under our Credit Agreement. Furthermore, additional equity financing may dilute the interests of our common stockholders, and debt financing, if available, may involve restrictive covenants that could further restrict our business activities or our ability to execute our strategic objectives and could reduce our profitability. If we cannot refinance our Credit Agreement or raise or borrow funds on acceptable terms, we may not be able to grow our business or respond to competitive pressures.

In addition, advances under our revolving credit facility generally bear interest based on (i) the Alternate Base Rate (as defined in our Credit Agreement) or (ii) the Adjusted LIBO Rate (as defined in our Credit Agreement) and calculated using the London Inter-bank Offered Rate (“LIBOR”)). Although our Credit Agreement matures on June 28, 2019, we would expect that any extended or refinanced indebtedness would bear interest on similar terms. On July 27, 2017, the Financial Conduct Authority (the authority that regulates LIBOR) announced that it intends to stop compelling banks to submit rates for the calculation of LIBOR after 2021, and it is unclear whether new methods of calculating LIBOR will be established. If LIBOR ceases to exist after 2021, any calculation of interest based upon the Alternate Base Rate (or any comparable or replacement formulation), may result in higher interest rates. To the extent that these interest rates increase, our interest expense will increase, which could adversely affect our financial condition, operating results and cash flows.

We may not have the ability to use cash to settle the principal amount of our 3.25% convertible notes due 2022 (the "Notes") upon conversion or to repurchase the Notes upon a fundamental change, which could result in dilution and could adversely affect our financial condition.

The Notes are convertible any time prior to their maturity on April 1, 2022 into cash, stock or a combination of cash and stock at an initial conversion rate set forth in the indenture governing the Notes (the "Indenture"). Notes that are converted in connection with a make-whole fundamental change (as defined in the Indenture) may be entitled to an increase in the conversation rate for such Notes. Upon a conversion event, if we do not have adequate cash available or cannot obtain additional financing, or our use of cash is restricted by applicable law, regulations or agreements governing our current or future indebtedness, we may not be able to use cash to settle the principal amount of the Notes upon conversion. If we settle any portion of the principal amount of the Notes upon conversion in stock, it will result in immediate dilution to the ownership interests of existing stockholders and such dilution could be material.

In addition, holders of the Notes have the right to require us to repurchase their Notes upon the occurrence of a fundamental change (as defined in the Indenture) at a repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any. If we do not have adequate cash available or cannot obtain additional financing, or our use of cash is restricted by applicable law, regulations or agreements governing our current or future indebtedness, we may not be able repurchase the Notes when required under the Indenture, which would constitute an event of default under the Indenture. An event of default under the Indenture could also lead to a default under other agreements governing our current and future indebtedness, and if the repayment of such

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other indebtedness were accelerated, we may not have sufficient funds to repay the indebtedness and repurchase the Notes or make cash payments upon conversion of the Notes.

The terms of the Notes could delay or prevent an attempt to take over our Company.

The terms of the Notes require us to repurchase the Notes in the event of a fundamental change. A takeover of our Company would constitute a fundamental change. This could have the effect of delaying or preventing a takeover of our Company that may otherwise be beneficial to our stockholders.

Risks Related to Ownership of Our Common Stock

The trading price of our common stock is highly volatile.

The trading price of our common stock has fluctuated significantly since our initial listing on NASDAQ. We expect that the trading price of our stock will continue to be volatile due to variations in our operating results and also may change in response to other factors, including factors specific to technology and Internet commerce companies, many of which are beyond our control. Among the factors that could affect our stock price are:

• our financial results;

• any financial projections that we provide to the public, any changes in these projections or our     failure for any reason to meet these projections or projections made by research analysts;

• the number of shares of our common stock that are available for sale;

• the relative success of competitive products or services;

• the public's response to press releases or other public announcements by us or others, including our filings with the SEC and announcements relating to litigation;

• speculation about our business in the press or the investment community;

• future sales of our common stock by our significant stockholders, officers and directors;

• announcements about our share repurchase program and purchases under the program;

• changes in our capital structure, such as future issuances of debt or equity securities;

• our entry into new markets or exits from existing markets;

• regulatory developments in the United States or foreign countries;

• strategic acquisitions, joint ventures or restructurings announced or consummated by us or our competitors;

• strategic dispositions of businesses or other assets announced or consummated by us; and

• changes in accounting principles.

We expect the stock price volatility to continue for the foreseeable future as a result of these and other factors.

If securities or industry analysts do not publish research or reports about our business, or publish inaccurate or unfavorable research reports about our business, our share price and trading volume could decline.

The trading market for our common stock depends, in part, on the research and reports that securities or industry analysts publish about us or our business. We do not have any control over these analysts, and in the past, we have had changes in analyst ratings that have affected our stock price. If one or more of the analysts who cover us should downgrade our shares or change their opinion of our shares, industry sector or products, our share price would likely decline. If one or more of these analysts ceases coverage of our company or fails to regularly publish reports on us, we could lose visibility in the financial markets, which could cause our share price or trading volume to decline.

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The concentration of our common stock ownership may limit stockholders' ability to influence corporate matters.

On October 31, 2016, each share of our Class A common stock and Class B common stock automatically converted (the "Conversion") into a single class of common stock. As a result of the Conversion, each holder of our common stock is entitled to one vote per share on any matter that is submitted to a vote of stockholders. Although the voting power of our founders was more concentrated prior to the Conversion, Eric Lefkofsky and his affiliates own approximately 15% of our common stock as of December 31, 2018. He, therefore, may have significant influence over matters requiring stockholder approval, including the election of directors and significant corporate transactions, such as a merger or other sale of our company or its assets. This concentrated ownership could limit stockholders' ability to influence corporate matters and, as a result, we may take actions that our stockholders do not view as beneficial. As a result, the market price of our common stock could be adversely affected.

We do not intend to pay dividends for the foreseeable future.

We intend to retain all of our earnings for the foreseeable future to finance the operation and expansion of our business and do not anticipate paying cash dividends. As a result, stockholders can expect to receive a return on their investment in our common stock only if the market price of the stock increases.

Provisions in our charter documents and under Delaware law could discourage a takeover that stockholders may consider favorable.

Provisions in our certificate of incorporation and bylaws may have the effect of delaying or preventing a change of control or changes in our management. These provisions include the following:

• Our Board of Directors has the right to elect directors to fill a vacancy created by the expansion of the Board of Directors or the resignation, death or removal of a director, which prevents stockholders from being able to fill vacancies on our Board of Directors.

• Special meetings of our stockholders may be called only by our Chairman of the Board, our Chief Executive Officer, our Board of Directors or holders of not less than the majority of our issued and outstanding common stock. This limits the ability of minority stockholders to take certain actions without an annual meeting of stockholders.

• Our stockholders may not act by written consent unless the action to be effected and the taking of such action by written consent is approved in advance by our Board of Directors. As a result, a holder, or holders, controlling a majority of our common stock would generally not be able to take certain actions without holding a stockholders' meeting.

• Our certificate of incorporation prohibits cumulative voting in the election of directors. This limits the ability of minority stockholders to elect director candidates.

• Stockholders must provide timely notice to nominate individuals for election to the Board of Directors or to propose matters that can be acted upon at an annual meeting of stockholders. These provisions may discourage or deter a potential acquiror from conducting a solicitation of proxies to elect the acquiror's own slate of directors or otherwise attempting to obtain control of our company.

• Our Board of Directors may issue, without stockholder approval, shares of undesignated preferred stock. The ability to authorize undesignated preferred stock makes it possible for our Board of Directors to issue preferred stock with voting or other rights or preferences that could impede the success of any attempt to acquire us.

The convertible note hedge and warrant transactions may affect the value of our common stock.

On May 9, 2016, we purchased convertible note hedges from certain bank counterparties. The convertible note hedges are intended to reduce the potential economic dilution upon conversion of the Notes. On May 9, 2016, we also sold warrants to certain bank counterparties. The warrant transactions would separately have a dilutive effect to the extent that the market price per share of our common stock exceeds the applicable strike price of the warrants.

The bank counterparties or their respective affiliates may modify their initial hedge positions by entering into or unwinding various derivatives contracts with respect to our common stock and/or purchasing or selling our common stock or other securities of ours in secondary market transactions prior to the maturity of the Notes (and are likely to do so during any observation period related to a conversion of Notes or following any repurchase of Notes by us on

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any fundamental change repurchase date or otherwise). This activity could cause or avoid a significant change in the market price of our common stock.

In addition, in some circumstances, such as an early termination of the convertible note hedge and warrant transactions, including in connection with certain change of control transactions or other extraordinary events, the bank counterparties or their respective affiliates may unwind their hedge positions with respect to our common stock, which could adversely affect the value of our common stock.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

ITEM 2. PROPERTIES

As of December 31, 2018, we owned no property and had leases for approximately 1.3 million square feet of space. Our corporate headquarters and principal executive offices are located in Chicago, Illinois. Other properties are located throughout the world and largely represent local operating facilities. We believe that our properties are in good condition and meet the needs of our business, and that suitable additional or alternative space will be available as needed to accommodate our business operations and future growth.

Description of Use	Segment	Square Feet	Various lease expirations through
Corporate offices	North America	555,000	January 2026
Corporate offices	International	371,000	June 2025
Fulfillment and data centers	North America	360,000	August 2023
Fulfillment and data centers	International	9,000	March 2024

ITEM 3. LEGAL PROCEEDINGS

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For a description of our material pending legal proceedings, please see Item 8, Note 10, Commitments and Contingencies, to the consolidated financial statements of this Annual Report on Form 10-K.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

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PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Our common stock has been listed on the NASDAQ Global Select Market under the symbol "GRPN" since November 4, 2011.

Holders

As of February 8, 2019, there were 160 holders of record of our common stock. Each holder of our common stock is entitled to one vote per share on any matter that is submitted to a vote of stockholders.

Equity Compensation Plan Information

Information about the securities authorized for issuance under our compensation plans is incorporated by reference from the Proxy Statement for our 2019 Annual Meeting of Stockholders.

Recent Sales of Unregistered Securities

During the year ended December 31, 2018, we did not issue any unregistered equity securities.

Issuer Purchases of Equity Securities

In May 2018, the Board authorized us to repurchase up to $300.0 million of our common stock under a new share repurchase program. The prior share repurchase program, which authorized repurchases up to $700.0 million, expired in April 2018. The timing and amount of share repurchases, if any, will be determined based on market conditions, limitations under the Amended and Restated Credit Agreement, share price and other factors, and the share repurchase program may be terminated at any time. We will fund the repurchases through cash on hand, future cash flows and borrowings under our credit facility. Repurchases will be made in compliance with SEC rules and other legal requirements and may be made in part under a Rule 10b5-1 plan, which permits stock repurchases when we may otherwise be precluded from doing so.

During the three months ended December 31, 2018, we repurchased 3,252,886 shares for an aggregate purchase price of $10.0 million (including fees and commissions) under the new repurchase program. As of December 31, 2018, up to $290.0 million of common stock remained available for purchase under that program. A summary of our common stock repurchases during the three months ended December 31, 2018 is set forth in the following table:

Date	Total Number of Shares Purchased	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Program	Maximum Number (or Approximate Dollar Value) of Shares that May Yet Be Purchased Under Program
October 1-31, 2018	—	$	—	—	$	300,000,000
November 1-30, 2018	638,685	3.09		638,685	298,035,664
December 1-31, 2018	2,614,201	3.09		2,614,201	290,000,000
Total	3,252,886	$	3.09	3,252,886	$	290,000,000

From the inception of our share repurchase programs in August 2013 through December 31, 2018, we have repurchased 191,855,128 shares of our common stock (or Class A common stock prior to the conversion of our Class A common stock and Class B common stock to a single class of common stock on October 31, 2016) for an aggregate purchase price of $877.5 million (including fees and commissions).

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The following table provides information about purchases of shares of our common stock during the three months ended December 31, 2018 related to shares withheld upon vesting of restricted stock units for minimum tax withholding obligations:

Date	Total Number of Shares Purchased (1)	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Program	Maximum Number (or Approximate Dollar Value) of Shares that May Yet Be Purchased Under Program
October 1-31, 2018	333,406	$	3.47	—	—
November 1-30, 2018	177,235	3.19		—	—
December 1-31, 2018	610,565	3.20		—	—
Total	1,121,206	$	3.28	—	—

(1) Total number of shares delivered to us by employees to satisfy the mandatory tax withholding requirement upon vesting of stock-based compensation awards.

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Stock Performance Graph

This performance graph shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the Exchange Act), or incorporated by reference into any filing of Groupon, Inc. under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing. Our stock price performance shown in the graph below is not indicative of our future stock price performance.

The graph set forth below compares the cumulative total return on our common stock (or Class A common stock prior to the conversion of our Class A common stock and Class B common stock to a single class of common stock on October 31, 2016) with the cumulative total return of the Nasdaq Composite Index and the Nasdaq 100 Index, resulting from an initial investment of $100 in each and assuming the reinvestment of any dividends, based on closing prices on the last trading day of each year end period for 2014, 2015, 2016, 2017 and 2018.

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ITEM 6. SELECTED FINANCIAL DATA

The following selected consolidated financial data should be read in conjunction with our consolidated financial statements and the accompanying notes thereto in Item 8 of this Annual Report on Form 10-K, and the information contained in Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations,of this Annual Report on Form 10-K. Historical results are not necessarily indicative of future results.

	Year Ended December 31,
	2018			2017			2016			2015			2014
Consolidated Statements of Operations Data (1):	(in thousands, except share and per share amounts)
Revenue:
Service	$	1,205,487		$	1,266,452		$	1,206,441		$	1,250,149		$	1,353,948
Product	1,431,259			1,577,425			1,807,174			1,704,667			1,504,698
Total revenue	2,636,746			2,843,877			3,013,615			2,954,816			2,858,646
Cost of revenue:
Service	120,077			160,810			150,031			158,095			173,204
Product	1,196,068			1,349,206			1,582,931			1,508,911			1,339,881
Total cost of revenue	1,316,145			1,510,016			1,732,962			1,667,006			1,513,085
Gross profit	1,320,601			1,333,861			1,280,653			1,287,810			1,345,561
Operating expenses:
Marketing	395,737			400,918			352,175			241,342			227,855
Selling, general and administrative (2)	870,961			901,829			999,677			1,102,385			1,081,468
Restructuring charges	(136		)	18,828			40,438			28,464			—
Gain on sale of intangible assets	—			(17,149		)	—			—			—
Gains on business dispositions	—			—			(11,399		)	(13,710		)	—
Total operating expenses	1,266,562			1,304,426			1,380,891			1,358,481			1,309,323
Income (loss) from operations	54,039			29,435			(100,238		)	(70,671		)	36,238
Other income (expense), net	(53,008		)	6,710			(71,289		)	(25,586		)	(31,655		)
Income (loss) from continuing operations before provision (benefit) for income taxes	1,031			36,145			(171,527		)	(96,257		)	4,583
Provision (benefit) for income taxes	(957		)	7,544			(5,318		)	(23,010		)	15,308
Income (loss) from continuing operations	1,988			28,601			(166,209		)	(73,247		)	(10,725		)
Income (loss) from discontinued operations, net of tax	—			(1,974		)	(17,114		)	106,926			(53,194		)
Net income (loss)	1,988			26,627			(183,323		)	33,679			(63,919		)
Net income attributable to noncontrolling interests	(13,067		)	(12,587		)	(11,264		)	(13,011		)	(9,171		)
Net income (loss) attributable to Groupon, Inc.	$	(11,079	)	$	14,040		$	(194,587	)	$	20,668		$	(73,090	)
Basic net income (loss) per share (3):
Continuing operations	$	(0.02	)	$	0.03		$	(0.31	)	$	(0.13	)	$	(0.03	)
Discontinued operations	0.00			(0.00)			(0.03		)	0.16			(0.08		)
Basic net income (loss) per share	$	(0.02	)	$	0.03		$	(0.34	)	$	0.03		$	(0.11	)
Diluted net income (loss) per share(3):
Continuing operations	$	(0.02	)	$	0.03		$	(0.31	)	$	(0.13	)	$	(0.03	)
Discontinued operations	0.00			(0.01		)	(0.03		)	0.16			(0.08		)
Diluted net income (loss) per share	$	(0.02	)	$	0.02		$	(0.34	)	$	0.03		$	(0.11	)
Weighted average number of shares outstanding (2)
Basic	566,511,108			559,367,075			576,354,258			650,106,225			674,832,393
Diluted	566,511,108			568,418,371			576,354,258			650,106,225			674,832,393

(1) The consolidated statements of operations data for prior years has been retrospectively adjusted to reflect discontinued operations. Refer to Item 8, Note 3, Discontinued Operations and Other Business Dispositions, for additional information.

(2) Includes $0.7 million, $5.7 million, $1.9 million and $1.3 million of acquisition-related expenses for the years ended December 31, 2018, December 31, 2016, December 31, 2015 and December 31, 2014. Refer to Item 8, Note 4, Business Combinations, for additional information.

(3) The structure of our common stock changed during the year ended December 31, 2016. Refer to Item 8, Note 11, Stockholders' Equity, and Note 18, Income (Loss) Per Share, for additional information.

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	As of December 31,
	2018		2017			2016			2015			2014
Consolidated Balance Sheet Data:	(in thousands)
Cash and cash equivalents	$	841,021	$	880,129		$	862,977		$	824,307		$	982,862
Working capital (deficit)	41,455		(61,051		)	(121,115		)	(128,283		)	91,460
Total assets	1,642,142		1,677,505			1,761,377			1,796,264			2,227,597
Total long-term liabilities	302,357		292,161			283,264			122,152			169,055
Total Groupon, Inc. Stockholders' Equity	381,248		250,973			264,420			469,398			762,826

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ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis of our financial condition and results of operations should be read together with our consolidated financial statements and related notes included under Item 8 of this Annual Report on Form 10-K. This discussion contains forward-looking statements about our business and operations. Our actual results may differ materially from those we currently anticipate as a result of many factors, including those we describe under Risk Factors and elsewhere in this Annual Report. See Part I, Forward-Looking Statements, for additional information.

Overview

Groupon operates online local commerce marketplaces throughout the world that connect merchants to consumers by offering goods and services, generally at a discount. Consumers access those marketplaces through our websites, primarily localized groupon.com sites in many countries, and our mobile applications. Traditionally, local merchants have tried to reach consumers and generate sales through a variety of methods, including online advertising, paid telephone directories, direct mail, newspaper, radio, television and other promotions. By bringing the brick and mortar world of local commerce onto the Internet, Groupon is helping local merchants to attract customers and sell goods and services. We provide consumers with savings and help them discover what to do, eat, see and buy and where to travel.

Our operations are organized into two segments: North America and International. For the year ended December 31, 2018, we derived 62.2% of our revenue from our North America segment and 37.8% of our revenue from our International segment. See Item 8, Note 19, Segment Information, for additional information. We offer goods and services through our online marketplaces in three primary categories, Local, Goods and Travel.

We generate both product and service revenue from our business operations. Our product revenue from transactions in which we sell merchandise inventory in our Goods category is the purchase price received from the customer. Our service revenue from transactions in which we earn commissions by selling goods or services on behalf of third-party merchants is the purchase price collected from the customer less the portion of the purchase price paid to the merchant.

Since early 2017, we have shifted our focus towards long-term gross profit growth. As part of our growth strategy, we have focused on enhancing the customer experience, establishing Groupon as an open platform, continuing to realize our international potential, and maintaining a culture of operational efficiency. We have developed and are testing a number of product enhancements to make our offerings easier to use for both customers and merchants, including cash back offers linked to customer credit cards and booking capabilities. We have also entered into commercial agreements with third parties that enable us to feature additional merchant offerings through our marketplaces. We have driven efficiency in our marketing spend by focusing that spend on customers who we believe will have higher long-term value.

In April 2018, we expanded our International segment offerings through the acquisition of 80% of the outstanding shares of Cloud Savings Company, Ltd. ("Cloud Savings"), a UK-based business that operates online discount code and digital gift card platforms. In December 2018, we exercised our right to acquire the remaining outstanding shares of Cloud Savings. See Item 8, Note 4, Business Combinations, for further information.

In October 2016, we completed a strategic review of our international markets in connection with our efforts to optimize our global footprint and focus on the markets that we believe to have the greatest potential to benefit our long-term financial performance. Based on that review, we decided to focus our business on 15 core countries, which are primarily based in North America and EMEA, and to pursue strategic alternatives for our operations in the remaining 11 countries, which were primarily based in Asia and Latin America. Between November 2016 and March 2017, we exited our operations in the 11 non-core countries and their results have been presented as discontinued operations. See Item 8, Note 3, Discontinued Operations and Other Business Dispositions, for additional information about the dispositions.

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How We Measure Our Business

We measure our business with several financial and operating metrics. We use those metrics to assess the progress of our business and make decisions on where to allocate capital, time and technology investments. Certain of the financial metrics are reported in accordance with U.S. GAAP and certain of those metrics are considered non-GAAP financial measures. As our business evolves, we may make changes in future periods to the key financial and operating metrics that we use to measure our business. For further information and reconciliations to the most applicable financial measures under U.S. GAAP, refer to our discussion under Non-GAAP Financial Measures in the Results of Operations section.

Financial Metrics

• Revenue. Product revenue is earned from direct sales of merchandise inventory through our Goods category and is reported on a gross basis as the purchase price received from the customer. Service revenue is earned from transactions in which we earn commissions by selling goods or services on behalf of third-party merchants, primarily through sales of vouchers and similar transactions in which we collect the transaction price from the customer and remit a portion of that transaction price to the third-party merchant who will provide the related goods or services. Service revenue from those transactions is reported on a net basis as the purchase price collected from the customer less the portion of the purchase price that is payable to the third-party merchant. Service revenue also includes commissions we earn when customers make purchases with retailers using digital coupons accessed through our websites and mobile applications and from voucherless merchant offerings in which customers earn cash back on their credit card statements when they transact with third-party merchants.

• Gross profit. Gross profit reflects the net margin earned after deducting our cost of revenue from our revenue. Due to the lack of comparability between product revenue, which is reported on a gross basis, and service revenue, which primarily consists of transactions reported on a net basis, we believe that gross profit is an important measure for evaluating our performance.

• Adjusted EBITDA. Adjusted EBITDA is a non-GAAP financial measure that we define as net income (loss) from continuing operations excluding income taxes, interest and other non-operating items, depreciation and amortization, stock-based compensation, acquisition-related expense (benefit), net and other special charges and credits, including items that are unusual in nature or infrequently occurring. For further information and a reconciliation to Income (loss) from continuing operations, refer to our discussion under Non-GAAP Financial Measures in the Results of Operations section.

• Free cash flow. Free cash flow is a non-GAAP financial measure that comprises net cash provided by (used in) operating activities from continuing operations less purchases of property and equipment and capitalized software from continuing operations. For further information and a reconciliation to Net cash provided by (used in) operating activities from continuing operations, refer to our discussion in the Liquidity and Capital Resources section.

The following table presents the above financial metrics for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017 (1)		2016 (1)
Revenue	$	2,636,746	$	2,843,877	$	3,013,615
Gross profit	1,320,601		1,333,861		1,280,653
Adjusted EBITDA	269,807		249,939		179,883
Free cash flow	121,160		71,387		61,958

(1) Prior period free cash flow information has been updated from $78.3 million and $60.6 million previously reported for the years ended December 31, 2017 and 2016 to reflect the adoption of ASU 2016-18, Statement of Cash Flows (Topic 230) - Restricted Cash, on January 1, 2018. See Item 8, Note 2, Summary of Significant Accounting Policies, for additional information on the adoption of ASU 2016-18.

Operating Metrics

• Gross Billings. This metric represents the total dollar value of customer purchases of goods and services. The substantial majority of our service revenue transactions is comprised of sales of vouchers and similar

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transactions in which we collect the transaction price from the customer and remit a portion of the transaction price to the third-party merchant who will provide the related goods or services. For these transactions, gross billings differs from revenue reported in our consolidated statements of operations, which is presented net of the merchant's share of the transaction price. For product revenue transactions, gross billings are equivalent to product revenue reported in our consolidated statements of operations. This metric is an indicator of our growth and business performance as it measures the dollar volume of transactions generated through our marketplaces. Tracking gross billings on service revenue transactions also allows us to monitor the percentage of gross billings that we are able to retain after payments to merchants. However, management is primarily focused on optimizing the business for long-term gross profit and adjusted EBITDA growth, rather than gross billings or revenue growth.

• Active customers. We define active customers as unique user accounts that have made a purchase during the trailing twelve months ("TTM") either through one of our online marketplaces or directly with a merchant for which we earned a commission. We consider this metric to be an important indicator of our business performance as it helps us to understand how the number of customers actively purchasing our offerings is trending. Some customers could establish and make purchases from more than one account, so it is possible that our active customer metric may count certain customers more than once in a given period. For entities that we have acquired in a business combination, this metric includes active customers of the acquired entity, including customers who made purchases prior to the acquisition. We do not include consumers who solely make purchases with retailers using digital coupons accessed through our websites and mobile applications in our active customer metric, and accordingly, the acquisition of Cloud Savings in April 2018 did not impact that metric.

Our active customer metric for the year ended December 31, 2018 declined from the year ended December 31, 2017. For the year ended December 31, 2017, our active customers increased compared with the year ended December 31, 2016. The decline in the current year is primarily attributable to a decline in traffic to our websites and mobile applications, as well as our efforts to improve the efficiency of our marketing spend by focusing that spend on customers who we believe will have higher long-term value. That strategy has resulted in lower marketing spend on less valuable customers, particularly in North America, which has adversely impacted our active customer metric. We expect the trend of declining active customers in North America to continue in 2019 due to ongoing traffic declines and our continued focus on attracting and retaining high-quality customers.

• Gross billings and gross profit per active customer. These metrics represent the TTM gross billings and gross profit generated per active customer. We use these metrics to evaluate trends in customer spend and in the average contribution to gross billings and gross profit on a per-customer basis. We updated the calculation of these metrics in the current year to reflect active customers as of the end of the period, rather than the average of active customers as of the beginning and end of the period, in the denominator of the calculations. Because our active customer metrics are based on purchases over a TTM period, we believe that this change improves the usefulness of these metrics. The prior period metrics presented below have been updated to reflect this change.

• Units. This metric represents the number of purchases during the reporting period, before refunds and cancellations, made either through one of our online marketplaces or directly with a merchant for which we earned a commission. We consider unit growth to be an important indicator of the total volume of business conducted through our marketplaces.

For the year ended December 31, 2018, our total units sold declined by 8.8%, as compared with the prior year, reflecting unit declines in our North America segment, partially offset by unit growth in our International segment. For the year ended December 31, 2017, our total units sold declined by 3.4%, as compared with the year ended December 31, 2016. The decline in total units sold in the current year was attributable to fewer active customers and lower frequency of purchases by these customers. We expect that trend to continue into 2019.

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Our gross billings for the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):

	Year Ended December 31,
	2018		2017		2016
Gross Billings	$	5,202,814	$	5,645,898	$	5,687,714

Our active customers, gross billings per active customer and gross profit per active customer for the TTM ended December 31, 2018, 2017 and 2016 were as follows:

	Year Ended December 31,
	2018		2017 (1)		2016 (1)
TTM Active customers (in thousands)	48,159		49,536		47,881
TTM Gross billings per active customer	$	108.03	$	113.98	$	118.79
TTM Gross profit per active customer	$	27.42	$	26.93	$	26.75

(1) TTM Gross billings per active customer have been updated from $115.91 and $124.26 previously reported for the TTM ended December 31, 2017 and 2016, and TTM Gross profit per active customer has been updated from $27.38 and $27.98 previously reported for the year ended December 31, 2017 and 2016 due to the change in the calculation discussed above.

Our units for the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):

	Year Ended December 31,
	2018	2017	2016
Units	172,305	188,905	195,646

Factors Affecting Our Performance

Attracting and Retaining Local Merchants. As we seek to build a more complete online local commerce marketplace platform, we depend on our ability to attract and retain merchants who are willing to offer discounted products and services through our marketplaces. Additionally, merchants can generally withdraw their offerings from our marketplaces at any time and their willingness to continue offering products and services through our platform depends on the effectiveness of our marketing and promotional services. We primarily source the deal offerings available on our marketplaces through our sales teams, which comprise a significant portion of our global employee base. We have also entered into commercial agreements with third parties that enable us to feature additional merchant offerings through our marketplaces. We continue to focus much of our sales efforts on sourcing local deal offerings in subcategories that we believe provide us with the best opportunities for high frequency customer purchase behavior. In connection with our efforts to grow our offerings in those high frequency subcategories, which include health, beauty and wellness, events and activities, and food and drink, we may be willing to offer more attractive terms to local merchants that could reduce our deal margins in future periods.

Growing our Active Customer Base and Customer Value. We must acquire and retain customers that we expect to have long-term value, and increase gross profit per customer in order to grow our business. Our marketing spending is intended to attract and retain active customers and to promote increased purchase frequency. We have made enhancements to our customer segmentation in recent periods that are intended to better focus our marketing efforts on customers that we believe have a greater potential for long-term gross profit generation. In addition to online marketing, such as search engine marketing ("SEM"), our marketing spending includes investments in offline campaigns intended to increase customer awareness and understanding of the Groupon brand and our product and service offerings. Additionally, we consider order discounts and certain other initiatives to drive customer acquisition and activation to be marketing-related activities, even though such activities may not be presented as marketing expenses in our consolidated statements of operations. The organic traffic to our websites and mobile applications from consumers responding to our emails has declined in recent years, such that an increasing proportion of our traffic is generated from SEM and other paid marketing channels. More recently, we have also experienced declines from other sources of organic traffic, such as search engine optimization ("SEO"). As such, we are focused on developing sources of organic traffic other than email and optimizing the efficiency of our marketing spending, which is primarily guided by return on investment thresholds that are currently based on expected months-to-payback targets ranging from 12 to 18 months. Additionally, our product and supply initiatives are intended to increase the rates at which visitors to our websites and mobile applications complete a purchase.

Investing in Growth. We have invested significantly in product and technology enhancements intended to support the growth of our online marketplaces and we intend to continue to do so in the future. We have also invested in business acquisitions to grow our merchant and customer base and advance our product and technology capabilities. We are currently developing and testing a number of product enhancements intended to make our offerings easier to use for both customers and merchants, including voucherless cash back offers linked to customer credit cards and functionality enabling appointment booking at the time an offering is purchased. We believe that those initiatives may be important drivers for increasing customer purchase frequency and growing our business over time. We are currently

focusing our efforts on growing customer awareness of those products and scaling the related merchant base. As such, our gross profit and operating income may be adversely impacted in the near term as we focus more of our marketing initiatives and related efforts on early stage voucherless cash back offerings. Additionally, our cash back offers linked to customer credit cards involve collecting a net fee from the merchant, rather than selling a voucher to the customer and then remitting a portion of the proceeds to the merchant. As we report sales of vouchers to customers as gross billings, the growth of voucherless cash back transactions in future periods could adversely impact our gross billings trends. Mobile consumers, particularly those accessing our marketplaces through the mobile web, generally complete purchases at a lower rate and at lower average transaction prices than consumers accessing our marketplaces through desktop computers. As a substantial majority of our traffic comes from consumers on mobile devices, we are focused on improving the mobile experience in order to increase purchase rates. Our initiatives to improve the mobile experience include improving page speeds, enhancing our relevance algorithms, streamlining the checkout process and redirecting mobile web consumers to our mobile applications.

Managing Operating Efficiency. We are focused on effectively managing our cost structure as we seek to generate and grow our profitability in future periods. From 2015 through 2017, we reduced the global footprint of our operations from 47 countries to 15 countries. Additionally, we significantly reduced our global workforce over that period as a result of our restructuring actions. Those restructuring actions and our continuing efforts to automate internal processes have allowed us to centralize many of our back office activities in lower cost shared service centers resulting in significant reductions in our selling, general and administrative expenses in recent periods. We have primarily used those savings to invest in marketing and product enhancements intended to drive the long-term growth of our business. We intend to continue to focus on maintaining operating efficiency.

Results of Operations

Gross Billings

Gross billings is an operating metric that represents the total dollar value of customer purchases of products and services. Gross billings is presented net of customer refunds, order discounts and sales and related taxes. In our Goods category, we generate gross billings from product revenue transactions in which we sell merchandise inventory directly to customers, as well as service revenue transactions in which we sell products on behalf of third-party merchants.

Comparison of the Years Ended December 31, 2018 and 2017:

Gross billings for the years ended December 31, 2018 and 2017 were as follows (dollars in thousands):

	Year Ended December 31,
	2018		2017		$ Change			% Change
Gross billings:
Service	$	3,771,555	$	4,068,473	$	(296,918	)	(7.3	)%
Product	1,431,259		1,577,425		(146,166		)	(9.3	)
Total gross billings	$	5,202,814	$	5,645,898	$	(443,084	)	(7.8	)

The effect on our gross billings for the year ended December 31, 2018 from changes in exchange rates versus the U.S. dollar was as follows (in thousands):

	Year Ended December 31, 2018
	At Avg. 2017 Rates (1)		Exchange Rate Effect (2)		As Reported
Gross billings	$	5,147,297	$	55,517	$	5,202,814

(1) Represents the financial statement balances that would have resulted had exchange rates in the reporting period been the same as those in effect in the prior year period.

(2) Represents the increase or decrease in the reported amount resulting from changes in exchange rates from those in effect in the prior year period.

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Gross Billings by Segment

Gross billings by segment for theyears ended December 31, 2018 and 2017were as follows (dollars in thousands):

	Year Ended December 31,
	2018		2017		$ Change			% Change
North America
Service gross billings:
Local	$	2,161,192	$	2,415,243	$	(254,051	)	(10.5	)%
Travel	352,247		404,523		(52,276		)	(12.9	)
Goods	113,863		114,638		(775		)	(0.7	)
Product gross billings - Goods	796,393		993,326		(196,933		)	(19.8	)
Total North America gross billings	3,423,695		3,927,730		(504,035		)	(12.8	)
International
Service gross billings:
Local	865,271		812,785		52,486			6.5
Travel	207,490		208,645		(1,155		)	(0.6	)
Goods	71,492		112,639		(41,147		)	(36.5	)
Product gross billings - Goods	634,866		584,099		50,767			8.7
Total International gross billings	1,779,119		1,718,168		60,951			3.5
Total gross billings	$	5,202,814	$	5,645,898	$	(443,084	)	(7.8	)

The percentages of gross billings by segment for the years ended December 31, 2018 and 2017 were as follows:

2018 2017

North America International

North America

North America gross billings for the year ended December 31, 2018 decreased $504.0 million from the prior year due to a decline in each of our Local, Goods and Travel categories. The primary drivers of the decline included the following:

• Lower customer traffic, primarily from organic traffic sources;

• Our shift of customer impressions from traditional voucher offerings with food and drink merchants towards voucherless cash-back offerings as we seek to enhance convenience for our customers. While we believe that voucherless cash-back offerings have the potential to ultimately drive long-term gross profit growth, the shift away from traditional food and drink vouchers is adversely impacting our gross billings in the near term;

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• Our ongoing focus on optimizing for long-term gross profit generation rather than gross billings growth has resulted in merchandising and product mix decisions that have adversely impacted transaction volume and gross billings from our Goods category;

• We ceased most of our food delivery operations in the third quarter 2017, which resulted in a $45.9 milliondecrease in Local gross billings as compared with the prior year period; and

• A $25.5 million unfavorable impact on gross billings for the year ended December 31, 2018 as a result of adopting Accounting Standards Codification Topic 606, Revenue from Contracts with Customers ("Topic 606") as compared with previous accounting guidance. See Item 8, Note 2, Summary of Significant Accounting Policies, and Note 13, Revenue Recognition, for additional information on the impact of adopting Topic 606 and its related amendments on our accounting policies.

The above drivers adversely impacted gross billings per active customer, which was $111.96 for the year ended December 31, 2018, as compared with $120.04 in the prior year period, and total units sold, which decreased to 111.4 million for the year ended December 31, 2018, as compared with 129.2 million units in the prior year period.

International

International gross billings increased $61.0 million in 2018, primarily due to a $55.5 million benefit from year-over-year changes in foreign currency rates, higher transaction volume driven in part by our customer acquisition and the expansion of our digital coupons offerings through our acquisition of Cloud Savings. These increases were partially offset by the impact of pricing and promotional strategies on our international gross billings per unit.

In addition, there was a $2.0 millionunfavorable impact on gross billings for the year ended December 31, 2018 as a result of adopting Topic 606 as compared with previous accounting guidance. See Item 8, Note 2, Summary of Significant Accounting Policies, and Note 13, Revenue Recognition, for additional information on the impact of adopting Topic 606 and its related amendments on our accounting policies.

Comparison of the Years Ended December 31, 2017 and 2016

Gross billings for the years ended December 31, 2017 and 2016 were as follows (dollars in thousands):

	Year Ended December 31,
	2017		2016		$ Change			% Change
Gross billings:
Service	$	4,068,473	$	3,880,540	$	187,933		4.8	%
Product	1,577,425		1,807,174		(229,749		)	(12.7	)
Total gross billings	$	5,645,898	$	5,687,714	$	(41,816	)	(0.7	)

The effect on our gross billings for the year ended December 31, 2017 from changes in exchange rates versus the U.S. dollar was as follows (in thousands):

	Year Ended December 31, 2017
	At Avg. 2016 Rates (1)		Exchange Rate Effect (2)		As Reported
Gross billings	$	5,619,119	$	26,779	$	5,645,898

(1) Represents the financial statement balances that would have resulted had exchange rates in the reporting period been the same as those in effect in the prior year period.

(2) Represents the increase or decrease in the reported amount resulting from changes in exchange rates from those in effect in the prior year period.

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Gross Billings by Segment

Gross billings by segment for the years endedDecember 31, 2017 and 2016were as follows (dollars in thousands):

	Year Ended December 31,
	2017		2016		$ Change			% Change
North America
Service gross billings:
Local	$	2,415,243	$	2,203,514	$	211,729		9.6	%
Travel	404,523		392,401		12,122			3.1
Goods	114,638		42,696		71,942			168.5
Product gross billings - Goods	993,326		1,297,810		(304,484		)	(23.5	)
Total North America gross billings	3,927,730		3,936,421		(8,691		)	(0.2	)
International
Service gross billings:
Local	812,785		802,403		10,382			1.3
Travel	208,645		239,195		(30,550		)	(12.8	)
Goods	112,639		200,331		(87,692		)	(43.8	)
Product gross billings - Goods	584,099		509,364		74,735			14.7
Total International gross billings	1,718,168		1,751,293		(33,125		)	(1.9	)
Total gross billings	$	5,645,898	$	5,687,714	$	(41,816	)	(0.7	)

The percentages of gross billings by segment for theyears endedDecember 31, 2017 and 2016 were as follows:

2017 2016

North America International

North America

North America gross billings for the year ended December 31, 2017 were relatively flat with the prior year, as the decrease in our Goods category was largely offset by increases in our Local category and, to a lesser extent, our Travel category. The primary drivers of the fluctuations included the following:

• We shifted the focus on our websites and mobile applications toward offerings with higher gross profit in connection with our efforts to drive gross profit growth, which contributed to a decrease in Goods gross billings and an increase in Local gross billings; and

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• LivingSocial, which we acquired during the fourth quarter of 2016, generated incremental gross billings of $75.7 million in Local, $12.8 million in Goods and $11.7 million in Travel for the full year ended December 31, 2017, as compared with the gross billings generated during the two-month period following its acquisition in the prior year.

Gross billings per active customer decreased to $120.04 for the year ended December 31, 2017, as compared with $126.47 in the corresponding prior year period. Additionally, the total number of units sold decreased to 129.2 million units for the year ended December 31, 2017, as compared with 132.6 million units in the prior year period.

International

International gross billings decreased $33.1 million during the year ended December 31, 2017, due to a decline in our Travel and Goods categories, partially offset by an increase in our Local category. The primary drivers of the decline included the following:

• We shifted the focus on our websites and mobile applications toward higher gross profit offerings in connection with our efforts to drive gross profit growth, which contributed to a decrease in Goods and Travel gross billings and an increase in Local gross billings; and

• We substantially eliminated Goods offerings from our marketplaces in Japan and Poland in connection with our efforts to de-emphasize lower margin product offerings, which resulted in a $13.0 million year-over-year reduction in Goods gross billings.

There was a $26.4 million favorable impact on international gross billings from year-over-year changes in foreign currency rates that partially offset the decline.

Revenue

We earn product revenue from direct sales of merchandise inventory through our Goods category. Product revenue is reported on a gross basis as the purchase price received from the customer. Service revenue is earned from transactions in which we earn commissions by selling goods or services on behalf of third-party merchants,

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primarily through sales of vouchers and similar transactions in which we collect the transaction price from the customer and remit a portion of that transaction price to the third-party merchant who will provide the related goods or services. Service revenue from those transactions is reported on a net basis as the purchase price collected from the customer less the portion of the purchase price that is payable to the third-party merchant. Service revenue also includes commissions we earn when customers make purchases with retailers using digital coupons accessed through our websites and mobile applications and from voucherless merchant offerings in which customers earn cash back on their credit card statements when they transact with third-party merchants.

Comparison of the Years Ended December 31, 2018 and 2017:

Revenue for theyears ended December 31, 2018 and 2017was as follows (dollars in thousands):

	Year Ended December 31,
	2018		2017		$ Change			% Change
Revenue:
Service	$	1,205,487	$	1,266,452	$	(60,965	)	(4.8	)%
Product	1,431,259		1,577,425		(146,166		)	(9.3	)
Total revenue	$	2,636,746	$	2,843,877	$	(207,131	)	(7.3	)

The effect on revenue for the year ended December 31, 2018 from changes in exchange rates versus the U.S. dollar was as follows (in thousands):

	Year Ended December 31, 2018
	At Avg. 2017 Rates (1)		Exchange Rate Effect (2)		As Reported
Revenue	$	2,603,611	$	33,135	$	2,636,746

(1) Represents the financial statement balance that would have resulted had exchange rates in the reporting period been the same as those in effect in the prior year period.

(2) Represents the increase or decrease in the reported amount resulting from changes in exchange rates from those in effect in the prior year period.

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Revenue by Segment

Revenue by category and segment for the years ended December 31, 2018 and 2017 was as follows (dollars in thousands):

	Year Ended December 31,
	2018		2017		$ Change			% Change
North America
Service revenue:
Local	$	752,863	$	825,579	$	(72,716	)	(8.8	)%
Travel	71,856		78,495		(6,639		)	(8.5	)
Goods	18,283		16,768		1,515			9.0
Product revenue - Goods	796,393		993,326		(196,933		)	(19.8	)
Total North America revenue	1,639,395		1,914,168		(274,773		)	(14.4	)
International
Service revenue:
Local	306,700		281,466		25,234			9.0
Travel	41,183		43,786		(2,603		)	(5.9	)
Goods	14,602		20,358		(5,756		)	(28.3	)
Product revenue - Goods	634,866		584,099		50,767			8.7
Total International revenue	997,351		929,709		67,642			7.3
Total revenue	$	2,636,746	$	2,843,877	$	(207,131	)	(7.3	)

The percentages of revenue by segment for the years ended December 31, 2018 and 2017 were as follows:

2018 2017

North America International

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The percentages of service gross billings that we retained after deducting the merchant's share for the years ended December 31, 2018 and 2017 were as follows:

North America International

North America

North America revenue decreased $274.8 million for the year ended December 31, 2018 due primarily to decreases of $72.7 million and $195.4 million in our Local and Goods categories, respectively. The decreases were driven primarily by the decline in transaction volume and gross billings, as discussed above.

In addition, for the year ended December 31, 2018, there was a $2.4 million favorable impact on revenue as a result of adopting Topic 606 as compared with previous accounting guidance. See Item 8, Note 2, Summary of Significant Accounting Policies, and Note 13, Revenue Recognition, for additional information on the impact of adopting the ASU and its related amendments on our accounting policies.

International

International revenue increased $67.6 million for the year ended December 31, 2018 driven primarily by the following:

• a $33.1 million favorable impact from year-over-year changes in foreign exchange rates;

• a shift in our Goods category mix from service revenue transactions, which are reported on a net basis, toward product revenue transactions, which are reported on a gross basis;

• higher transaction volume driven in part by our customer acquisition; and

• the expansion of our digital coupons offerings primarily through our acquisition of Cloud Savings; partially offset by

• the impact of pricing and promotional strategies and shift in mix of offerings sold.

In addition, there was a $2.9 million unfavorable impact on revenue for the year ended December 31, 2018 as a result of adopting Topic 606 as compared with previous accounting guidance. See Item 8, Note 2, Summary of Significant Accounting Policies, and Note 13, Revenue Recognition, for additional information on the impact of adopting the ASU and its related amendments on our accounting policies.

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Comparison of the Years Ended December 31, 2017 and 2016:

Revenue for theyears ended December 31, 2017 and 2016was as follows (dollars in thousands):

	Year Ended December 31,
	2017		2016		$ Change			% Change
Revenue:
Service	$	1,266,452	$	1,206,441	$	60,011		5.0	%
Product	1,577,425		1,807,174		(229,749		)	(12.7	)
Total revenue	$	2,843,877	$	3,013,615	$	(169,738	)	(5.6	)

The effect on revenue for the year ended December 31, 2017 from changes in exchange rates versus the U.S. dollar was as follows (dollars in thousands):

	Year Ended December 31, 2017
	At Avg. 2016 Rates (1)		Exchange Rate Effect (2)		As Reported
Revenue	$	2,825,004	$	18,873	$	2,843,877

(1) Represents the financial statement balance that would have resulted had exchange rates in the reporting period been the same as those in effect in the prior year period.

(2) Represents the increase or decrease in the reported amount resulting from changes in exchange rates from those in effect in the prior year period.

Revenue by Segment

Revenue by category and segment for the years ended December 31, 2017 and 2016 was as follows (dollars in thousands):

	Year Ended December 31,
	2017		2016		$ Change			% Change
North America
Service revenue:
Local	$	825,579	$	762,314	$	63,265		8.3	%
Travel	78,495		82,577		(4,082		)	(4.9	)
Goods	16,768		9,068		7,700			84.9
Product revenue - Goods	993,326		1,297,810		(304,484		)	(23.5	)
Total North America revenue	1,914,168		2,151,769		(237,601		)	(11.0	)
International
Service revenue:
Local	281,466		270,045		11,421			4.2
Travel	43,786		49,756		(5,970		)	(12.0	)
Goods	20,358		32,681		(12,323		)	(37.7	)
Product revenue - Goods	584,099		509,364		74,735			14.7
Total International revenue	929,709		861,846		67,863			7.9
Total revenue	$	2,843,877	$	3,013,615	$	(169,738	)	(5.6	)

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The percentages of revenue by segment for the years ended December 31, 2017 and 2016 were as follows:

2017 2016

North America International

The percentages of service gross billings that we retained after deducting the merchant's share for the years ended December 31, 2017 and 2016 were as follows:

North America International

North America

The decrease in North America segment revenue for the year ended December 31, 2017 reflects a $296.8 million decrease in our Goods category. As discussed above, we were increasingly focusing the business on initiatives that were intended to optimize for gross profit to a greater extent than revenue, particularly in our North America segment, including shifting more of the focus on our websites and mobile applications toward offerings in our Local category.

The decrease in revenue in our Goods category was partially offset by a $63.3 million increase in our Local category, which was primarily attributable to the increases in Local gross billings, as discussed above. Additionally, there was a $5.5 million increase in breakage revenue from customer credits and gift cards for the year ended December 31, 2017, as compared with the prior year.

The percentage of gross billings that we retained after deducting the merchant’s share on service revenue transactions was 31.4%, as compared with 32.4% in the prior year period. The percentage of gross billings that we retain after deducting the merchant's share reflects the overall results of individual deal-by-deal negotiations with merchants and can vary significantly from period-to-period.

LivingSocial, which we acquired during the fourth quarter 2016, generated incremental revenue of $32.0 million in Local, $10.9 million in Goods and $1.0 million in Travel for the full year ended December 31, 2017, as compared with the revenue generated during the two-month period following its acquisition in the prior year.

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International

International segment revenue increased $67.9 million for the year ended December 31, 2017, with a $62.4 million increase in our Goods category and an $11.4 million increase in our Local category, partially offset by a $6.0 million decrease in our Travel category. The primary drivers are the following:

• a shift in our Goods category mix from service revenue transactions, which are reported on a net basis, toward product revenue transactions, which are reported on a gross basis;

• a $19.0 million favorable impact from year-over-year changes in foreign exchange rates;

• an increase in our Local category due to growth in revenue from our digital coupons offerings; and

• changes in Local and Travel gross billings, as discussed above.

Cost of Revenue

Cost of revenue is comprised of direct and certain indirect costs incurred to generate revenue. Costs incurred to generate revenue, which include credit card processing fees, editorial costs, compensation expense for technology support personnel who are responsible for maintaining the infrastructure of our websites, amortization of internal-use software relating to customer-facing applications, web hosting and other processing fees are attributed to the cost of product and service revenue in proportion to gross billings during the period. For product revenue transactions, cost of revenue also includes the cost of inventory, shipping and fulfillment costs and inventory markdowns. Fulfillment costs are comprised of third-party logistics provider costs, as well as rent, depreciation, personnel costs and other costs of operating our fulfillment center. 

Comparison of the Years Ended December 31, 2018 and 2017:

Cost of revenue for the years endedDecember 31, 2018 and 2017 was as follows (dollars in thousands):

	Year Ended December 31,
	2018		2017		$ Change			% Change
Cost of revenue:
Service	$	120,077	$	160,810	$	(40,733	)	(25.3	)%
Product	1,196,068		1,349,206		(153,138		)	(11.4	)
Total cost of revenue	$	1,316,145	$	1,510,016	$	(193,871	)	(12.8	)

The effect on cost of revenue for the year ended December 31, 2018 from changes in exchange rates versus the U.S. dollar was as follows (in thousands):

	Year Ended December 31, 2018
	At Avg. 2017 Rates (1)		Exchange Rate Effect (2)		As Reported
Cost of revenue	$	1,296,296	$	19,849	$	1,316,145

(1) Represents the financial statement balance that would have resulted had exchange rates in the reporting period been the same as those in effect in the prior year period.

(2) Represents the increase or decrease in the reported amount resulting from changes in exchange rates from those in effect in the prior year period.

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Cost of Revenue by Segment

Cost of revenue by category and segment for the years endedDecember 31, 2018 and 2017was as follows (dollars in thousands):

	Year Ended December 31,
	2018		2017		$ Change			% Change
North America
Service cost of revenue:
Local	$	81,511	$	117,006	$	(35,495	)	(30.3	)%
Travel	13,911		17,901		(3,990		)	(22.3	)
Goods	2,981		3,839		(858		)	(22.3	)
Product cost of revenue - Goods	650,308		847,744		(197,436		)	(23.3	)
Total North America cost of revenue	748,711		986,490		(237,779		)	(24.1	)
International
Service cost of revenue:
Local	17,273		16,118		1,155			7.2
Travel	3,051		3,498		(447		)	(12.8	)
Goods	1,350		2,448		(1,098		)	(44.9	)
Product cost of revenue - Goods	545,760		501,462		44,298			8.8
Total International cost of revenue	567,434		523,526		43,908			8.4
Total cost of revenue	$	1,316,145	$	1,510,016	$	(193,871	)	(12.8	)

The percentages of cost of revenue by segment for the years endedDecember 31, 2018 and 2017 were as follows:

2018 2017

North America International

North America

North America cost of revenue decreased $237.8 million for the year ended December 31, 2018 due primarily to the decrease in transaction volume and gross billings for our Local and Goods categories as described above, our optimization of shipping and fulfillment costs, and a favorable impact of $25.4 million as a result of adopting Topic 606. See Item 8, Note 2, Summary of Significant Accounting Policies, and Note 13, Revenue Recognition, for additional information on the impact of adopting Topic 606 and its related amendments on our accounting policies.

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International

International cost of revenue increased $43.9 million for the year ended December 31, 2018 due primarily to a shift in our Goods category mix from service revenue transactions, which are reported on a net basis, toward product revenue transactions, which are reported on a gross basis, and a $19.9 millionunfavorable impact from year-over-year changes in foreign exchange rates.

Comparison of the Years Ended December 31, 2017 and 2016:

Cost of revenue for the years endedDecember 31, 2017 and 2016 was as follows (dollars in thousands):

	Year Ended December 31,
	2017		2016		$ Change			% Change
Cost of revenue:
Service	$	160,810	$	150,031	$	10,779		7.2
Product	1,349,206		1,582,931		(233,725		)	(14.8	)
Total cost of revenue	$	1,510,016	$	1,732,962	$	(222,946	)	(12.9	)

The effect on cost of revenue for the year ended December 31, 2017 from changes in exchange rates versus the U.S. dollar was as follows (in thousands):

	Year Ended December 31, 2017
	At Avg. 2016 Rates (1)		Exchange Rate Effect (2)		As Reported
Cost of revenue	$	1,496,302	$	13,714	$	1,510,016

(1) Represents the financial statement balance that would have resulted had exchange rates in the reporting period been the same as those in effect in the prior year period.

(2) Represents the increase or decrease in the reported amount resulting from changes in exchange rates from those in effect in the prior year period.

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Cost of Revenue by Segment

Cost of revenue by category and segment for the years endedDecember 31, 2017 and 2016 was as follows (dollars in thousands):

	Year Ended December 31,
	2017		2016		$ Change			% Change
North America
Service cost of revenue:
Local	$	117,006	$	101,331	$	15,675		15.5	%
Travel	17,901		18,222		(321		)	(1.8	)
Goods	3,839		1,598		2,241			140.2
Product cost of revenue - Goods	847,744		1,145,071		(297,327		)	(26.0	)
Total North America cost of revenue	986,490		1,266,222		(279,732		)	(22.1	)
International
Service cost of revenue:
Local	16,118		19,610		(3,492		)	(17.8	)
Travel	3,498		4,565		(1,067		)	(23.4	)
Goods	2,448		4,705		(2,257		)	(48.0	)
Product cost of revenue - Goods	501,462		437,860		63,602			14.5
Total International cost of revenue	523,526		466,740		56,786			12.2
Total cost of revenue	$	1,510,016	$	1,732,962	$	(222,946	)	(12.9	)

The percentages of cost of revenue by segment for the years endedDecember 31, 2017 and 2016were as follows:

2017 2016

North America International

North America

The decrease in North America cost of revenue for the year ended December 31, 2017 was primarily attributable to the decrease in product revenue and an increase in margins in that category.

International

International cost of revenue increased $56.8 million for the year ended December 31, 2017 due primarily to the growth in product revenue and a $13.7 million unfavorable impact from year-over-year changes in foreign exchange rates.

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Gross Profit

Comparison of the Years Ended December 31, 2018 and 2017:

Gross profit for the years ended December 31, 2018 and 2017 was as follows (dollars in thousands):

	Year Ended December 31,
	2018		2017		$ Change			% Change
Gross profit:
Service	$	1,085,410	$	1,105,642	$	(20,232	)	(1.8	)%
Product	235,191		228,219		6,972			3.1
Total gross profit	$	1,320,601	$	1,333,861	$	(13,260	)	(1.0	)

The effect on gross profit for the year ended December 31, 2018 from changes in exchange rates versus the U.S. dollar was as follows (in thousands):

	Year Ended December 31, 2018
	At Avg. 2017 Rates (1)	Exchange Rate Effect (2)	As Reported
Gross profit	1,307,315	13,286	$	1,320,601

(1) Represents the financial statement balance that would have resulted had exchange rates in the reporting period been the same as those in effect in the prior year period.

(2) Represents the increase or decrease in the reported amount resulting from changes in exchange rates from those in effect in the prior year period.

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Gross Profit by Segment

Gross profit by category and segment for the years ended December 31, 2018 and 2017 was as follows (dollars in thousands):

	Year Ended December 31,
	2018		2017		$ Change			% Change
North America
Service gross profit:
Local	$	671,352	$	708,573	$	(37,221	)	(5.3	)%
Travel	57,945		60,594		(2,649		)	(4.4	)
Goods	15,302		12,929		2,373			18.4
Product gross profit - Goods	146,085		145,582		503			0.3
Total North America gross profit	890,684		927,678		(36,994		)	(4.0	)
International
Service gross profit:
Local	289,427		265,348		24,079			9.1
Travel	38,132		40,288		(2,156		)	(5.4	)
Goods	13,252		17,910		(4,658		)	(26.0	)
Product gross profit - Goods	89,106		82,637		6,469			7.8
Total International gross profit	429,917		406,183		23,734			5.8
Total gross profit	$	1,320,601	$	1,333,861	$	(13,260	)	(1.0	)

The percentages of gross profit by segment for the years ended December 31, 2018 and 2017 were as follows:

2018 2017

North America International

North America

The decrease in North America gross profit for the year ended December 31, 2018 reflects a decline in revenue, as discussed above, which was partially offset by cost of revenue leverage driven by our optimization of shipping and fulfillment costs.

In addition, for the year ended December 31, 2018, there was a $27.8 million favorable impact on gross profit as a result of adopting Topic 606 as compared with previous accounting guidance. This favorability was primarily driven by the change in the timing of recognition of variable consideration for unredeemed vouchers. Beginning in the third quarter of 2017, we began to increasingly use pay-on-redemption terms for merchants in North America. As we expect to continue to shift toward pay-on-redemption terms going forward, we expect that the change to recognize estimated variable consideration at the time of sale under Topic 606 will drive further increases to North America gross profit in

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2019. See Item 8, Note 2, Summary of Significant Accounting Policies, and Note 13, Revenue Recognition, for additional information on the impact of adopting Topic 606 and its related amendments on our accounting policies.

International

The increase in International gross profit for the year ended December 31, 2018 was primarily attributable to the following:

• a $13.3 million favorable impact from year-over-year changes in foreign exchange rates;

• higher transaction volume driven in part by our customer acquisition; and

• the expansion of our digital coupons offerings primarily through our acquisition of Cloud Savings; partially offset by

• the impact of pricing and promotional strategies; and

• a $2.9 million unfavorable impact on gross profit for the year ended December 31, 2018 as a result of adopting Topic 606. See Item 8, Note 2, Summary of Significant Accounting Policies, and Note 13, Revenue Recognition, for additional information on the impact of adopting Topic 606 and its related amendments on our accounting policies.

Comparison of the Years Ended December 31, 2017 and 2016:

Gross profit for the years ended December 31, 2017 and 2016 was as follows (dollars in thousands):

	Year Ended December 31,
	2017		2016		$ Change		% Change
Gross profit:
Service	$	1,105,642	$	1,056,410	$	49,232	4.7	%
Product	228,219		224,243		3,976		1.8
Total gross profit	$	1,333,861	$	1,280,653	$	53,208	4.2

The effect on gross profit for the year ended December 31, 2017 from changes in exchange rates versus the U.S. dollar was as follows (in thousands):

	Year Ended December 31, 2017
	At Avg. 2016 Rates (1)		Exchange Rate Effect (2)		As Reported
Gross profit	$	1,328,702	$	5,159	$	1,333,861

(1) Represents the financial statement balance that would have resulted had exchange rates in the reporting period been the same as those in effect in the prior year period.

(2) Represents the increase or decrease in the reported amount resulting from changes in exchange rates from those in effect in the prior year period.

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Gross Profit by Segment

Gross profit by category and segment for the years ended December 31, 2017 and 2016 was as follows (dollars in thousands):

	Year Ended December 31,
	2017		2016		$ Change			% Change
North America
Service gross profit:
Local	$	708,573	$	660,983	$	47,590		7.2	%
Travel	60,594		64,355		(3,761		)	(5.8	)
Goods	12,929		7,470		5,459			73.1
Product gross profit - Goods	145,582		152,739		(7,157		)	(4.7	)
Total North America gross profit	927,678		885,547		42,131			4.8
International
Service gross profit:
Local	265,348		250,435		14,913			6.0
Travel	40,288		45,191		(4,903		)	(10.8	)
Goods	17,910		27,976		(10,066		)	(36.0	)
Product gross profit - Goods	82,637		71,504		11,133			15.6
Total International gross profit	406,183		395,106		11,077			2.8
Total gross profit	$	1,333,861	$	1,280,653	$	53,208		4.2

The percentages of gross profit by segment for the years ended December 31, 2017 and 2016 were as follows:

2017 2016

North America International

North America

The increasein North America gross profit for the year ended December 31, 2017 reflects a $47.6 millionincrease in gross profit from our Local category, which was attributable to the increase in service revenue from our Local category, as discussed above.

Gross profit from product revenue transactions declined by 4.7%, as compared with the 23.5% decrease in revenue from those transactions. That difference was attributable to increased gross margins on product revenue transactions, which were 14.7% in 2017 as compared with 11.8% in the prior year. That improvement resulted from our ongoing efforts to de-emphasize lower gross profit product offerings and reduce our shipping and fulfillment costs.

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International

The increasein International gross profit for the year endedDecember 31, 2017reflects an increase in service revenue transactions from our Local category, as discussed above, and a$5.3 million favorable impact from year-over-year changes in foreign exchange rates.

Marketing

Marketing expense consists primarily of online marketing costs, such as search engine marketing, advertising on social networking sites and affiliate programs, and offline marketing costs, such as television and radio advertising. Additionally, compensation expense for marketing employees is classified within marketing expense. We record these costs within Marketing on the consolidated statements of operations when incurred. From time to time, we offer deals with well-known national merchants for customer acquisition and activation purposes, for which the amount we owe the merchant for each voucher sold exceeds the transaction price paid by the customer. Our gross billings from those transactions generate no service revenue and our net cost (i.e., the excess of the amount owed to the merchant over the amount paid by the customer) is classified as marketing expense. We evaluate marketing expense as a percentage of gross profit because it gives us an indication of how well our marketing spend is driving gross profit performance.

Comparison of the Years Ended December 31, 2018 and 2017:

Marketing expense by segment as a percentage of gross profit for the years ended December 31, 2018 and 2017 was as follows (dollars in thousands):

	Year Ended December 31,
	2018		% of Gross Profit		2017		% of Gross Profit		$ Change			% Change
North America	$	273,787	30.7	%	$	299,454	32.3	%	$	(25,667	)	(8.6	)%
International	121,950		28.4		101,464		25.0		20,486			20.2
Total marketing	$	395,737	30.0		$	400,918	30.1		$	(5,181	)	(1.3	)

The percentages of marketing expense by segment for the years ended December 31, 2018 and 2017 were as follows:

2018 2017

North America International

North America

North America marketing expense and marketing expense as a percentage of gross profit for the year ended December 31, 2018decreased from the prior year period as we leveraged improved marketing analytics to drive efficiency in our marketing spend and maximize the lifetime value of our customer base.

International

International marketing expense and marketing expense as a percentage of gross profit for the year ended December 31, 2018increased year-over-year, driven primarily by our ongoing marketing investments to drive customer acquisition in our international markets. In addition, marketing expense increased$4.2 milliondue to an unfavorable impact from year-over-year changes in foreign exchange rates.

Comparison of the Years Ended December 31, 2017 and 2016:

Marketing expense by segment as a percentage of gross profit for the years ended December 31, 2017 and 2016 was as follows (dollars in thousands):

	Year Ended December 31,
	2017		% of Gross Profit		2016		% of Gross Profit		$ Change		% Change
North America	$	299,454	32.3	%	$	263,206	29.7	%	$	36,248	13.8	%
International	101,464		25.0		88,969		22.5		12,495		14.0
Total marketing	$	400,918	30.1		$	352,175	27.5		$	48,743	13.8

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The percentages of marketing expense by segment for the years ended December 31, 2017 and 2016 were as follows:

2017 2016

North America International

North America

The increases in North America segment marketing expense and marketing expense as a percentage of gross profit for the year ended December 31, 2017 were primarily attributable to an increase in investments in offline marketing to drive customer growth and awareness of the Groupon brand and our product and service offerings.

International

The increase in International segment marketing expense and marketing expense as a percentage of gross profit for the year ended December 31, 2017 was primarily attributable to our ongoing strategic initiative to drive customer growth. In addition, marketing expense increased $2.2 million due to an unfavorable impact from year-over-year changes in foreign exchange rates.

Selling, General, and Administrative

Selling expenses reported within Selling, general and administrative ("SG&A") on the consolidated statements of operations consist of sales commissions and other compensation expenses for sales representatives, as well as costs associated with supporting the sales function such as technology, telecommunications and travel. General and administrative expenses include compensation expense for employees involved in customer service, operations, technology and product development, as well as general corporate functions, such as finance, legal and human resources. Additional costs included in general and administrative include depreciation and amortization, rent, professional fees, litigation costs, travel and entertainment, recruiting, office supplies, maintenance, certain technology costs and other general corporate costs. We evaluate SG&A expense as a percentage of gross profit because it gives us an indication of our operating efficiency.

Comparison of the Years Ended December 31, 2018 and 2017:

SG&A as a percentage of gross profit for the years ended December 31, 2018 and 2017 was as follows (in thousands):

	Year Ended December 31,
	2018		% of Gross Profit		2017		% of Gross Profit		$ Change			% Change
Selling, general and administrative	$	870,961	66.0	%	$	901,829	67.6	%	$	(30,868	)	(3.4	)%

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The decrease in SG&A and SG&A as a percentage of gross profit for the year ended December 31, 2018 as compared with the prior year period was primarily due to the following:

• a $31.4 million decrease in compensation-related costs, including variable compensation; and

• decreases in facilities costs, systems costs, and other general expenses; partially offset by

• the expense related to our patent litigation with IBM of $34.6 million, as described in Item 8, Note 10, Commitments and Contingencies; and

• a $9.7 millionunfavorable impact from year-over-year changes in foreign currency exchange rates.

Comparison of the Years Ended December 31, 2017 and 2016:

SG&A as a percentage of gross profit for the years ended December 31, 2017 and 2016 was as follows (dollars in thousands):

	Year Ended December 31,
	2017		% of Gross Profit		2016		% of Gross Profit		$ Change			% Change
Selling, general and administrative	$	901,829	67.6	%	$	999,677	78.1	%	$	(97,848	)	(9.8	)%

The decrease in SG&A and SG&A as a percentage of gross profit was primarily attributable to our efforts to improve our cost structure, including a $62.8 million decrease in compensation-related costs, primarily due to headcount reductions as part of our restructuring plan, as well as decreases in facilities costs, systems costs, and other general expenses and a $0.2 million favorable impact from year-over-year changes in foreign currency exchange rates.

Restructuring Charges

Restructuring charges represent severance and benefit costs for workforce reductions, impairments of long-lived assets and other exit costs resulting from our restructuring activities. See Item 8, Note 14, Restructuring, for information about our restructuring plan.

Gain on Sale of Intangible Assets

During the third quarter of 2017, we sold customer lists and other intangible assets in certain food delivery markets to Grubhub Inc., resulting in a gain of $17.1 million. See Item 8, Note 6, Goodwill and Other Intangible Assets, for additional information.

Gains on Business Dispositions

During the year ended December 31, 2016, we sold our subsidiaries in Russia and Indonesia, and our point of sale business, Breadcrumb, resulting in a gain of $11.4 million. See Item 8, Note 3, Discontinued Operations and Other Business Dispositions, for additional information.

The financial results of those entities are presented within income from continuing operations in the accompanying consolidated financial statements through their respective disposition dates. Those financial results were not material for the year ended December 31, 2016.

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Income (Loss) from Operations

Comparison of the Years Ended December 31, 2018 and 2017:

Income (loss) from operations for the years ended December 31, 2018 and 2017 was as follows (dollars in thousands):

	Year Ended December 31,
	2018		2017			$ Change		% Change
North America	$	19,909	$	(45	)	$	19,954	NM
International	34,130		29,480			4,650		15.8
Income (loss) from operations	$	54,039	$	29,435		$	24,604	83.6

North America

The improvement in our income (loss) from operations was attributable to a $36.6 million decrease in SG&A costs, a $25.7 million decrease in marketing expense, and an $11.8 million decrease in restructuring costs, partially offset by a $37.0 million decrease in gross profit and a $17.1 million decrease in gains from the sale of intangible assets.

Income (loss) from operations includes stock-based compensation of $59.7 million and $76.1 million for the years ended December 31, 2018 and 2017.

For the year ended December 31, 2018, there was a $27.0 million favorable impact on income (loss) from operations as a result of adopting Topic 606 as compared with previous accounting guidance. See Item 8, Note 2, Summary of Significant Accounting Policies, and Note 13, Revenue Recognition, for additional information on the impact of adopting Topic 606 and its related amendments on our accounting policies.

International

The increase in our income from operations was primarily attributable to a $23.7 million increase in gross profit and a $7.1 million decrease in restructuring costs, partially offset by a $20.5 million increase in marketing expense and a $5.7 million increase in SG&A.

Income (loss) from operations includes stock-based compensation of $5.0 million and $5.7 million for the years ended December 31, 2018 and 2017.

For the year ended December 31, 2018, there was a $2.7 millionfavorable impact on income (loss) from operations as a result of adopting Topic 606 as compared with previous accounting guidance. See Item 8, Note 2, Summary of Significant Accounting Policies, and Note 13, Revenue Recognition, for additional information on the impact of adopting Topic 606 and its related amendments on our accounting policies.

Comparison of the Years Ended December 31, 2017 and 2016:

Income (loss) from operations for the years ended December 31, 2017 and 2016 was as follows (dollars in thousands):

	Year Ended December 31,
	2017			2016			$ Change		% Change
North America	$	(45	)	$	(85,423	)	$	85,378	99.9	%
International	29,480			(14,815		)	44,295		299.0
Income (loss) from operations	$	29,435		$	(100,238	)	$	129,673	129.4

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North America

The improvement in our income (loss) from operations was attributable to a $62.0 million decrease in SG&A, a $42.1 million increase in gross profit and a $17.1 million gain from the sale of customer lists and other intangible assets in certain food delivery markets. See Item 8, Note 6, Goodwill and Other Intangible Assets, for additional information. The reduction in our loss from operations was partially offset by a$36.2 millionincrease in marketing expense.

Income (loss) from operations includes $76.1 million and $104.7 million of stock-based compensation for the years ended December 31, 2017 and 2016.

International

The improvement in our income (loss) from operations was primarily attributable to a $35.8 million decrease in SG&A, a $21.6 million decrease in restructuring charges and an $11.1 million increase in gross profit. Those items were partially offset by a $12.5 million increase in marketing expense and an $11.4 million decrease in gains on business dispositions.

Income (loss) from operations includes $5.7 million and $9.5 million of stock-based compensation for the years ended December 31, 2017 and 2016.

Other Income (Expense), Net

Other income (expense), net includes interest income, interest expense, gains and losses on fair value option investments, impairments of investments and foreign currency gains and losses, primarily resulting from intercompany balances with our subsidiaries that are denominated in foreign currencies.

Comparison of the Years Ended December 31, 2018 and 2017:

Other income (expense), net for the years ended December 31, 2018 and 2017 was as follows (dollars in thousands):

	Year Ended December 31,
	2018			2017		$ Change			% Change
Other income (expense), net	$	(53,008	)	$	6,710	$	(59,718	)	(890.0	)%

Other income (expense), net for the year ended December 31, 2018 primarily consisted of the following:

• $21.9 million of interest expense primarily related to interest on our convertible notes;

• $20.3 million in foreign currency losses, which primarily resulted from intercompany balances with our subsidiaries that are denominated in foreign currencies. Those losses were driven by the depreciation of the Euro against the U.S. dollar from December 31, 2017 to December 31, 2018;

• $10.2 millionof impairments of minority investments. See Item 8, Note 7, Investments, for additional information; and

• $9.1 million of losses on fair value option investments. See Item 8, Note 7, Investments, for additional information.

Those items were partially offset by $6.4 million in interest income and a $2.4 million gain on an embedded derivative related to an available-for-sale security.

Other income (expense), net for the year ended December 31, 2017 primarily consisted of the following:

• $18.6 million in net foreign currency gains, which primarily resulted from intercompany balances with our subsidiaries that are denominated in foreign currencies. Those gains were driven by the appreciation of the Euro against the U.S. dollar from December 31, 2016 to December 31, 2017; and

• a $7.6 million gain on the sale of an investment. See Item 8, Note 7, Investments, for additional information.

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Those items were partially offset by $20.7 million of interest expense primarily related to interest on our convertible notes.

Comparison of the Years Ended December 31, 2017 and 2016:

Other income (expense), net for the years ended December 31, 2017 and 2016 was as follows (dollars in thousands):

	Year Ended December 31,
	2017		2016			$ Change		% Change
Other income (expense), net	$	6,710	$	(71,289	)	$	77,999	109.4	%

Other income (expense), net for the year ended December 31, 2017 primarily consisted of the following:

• $18.6 million in net foreign currency gains, which primarily resulted from intercompany balances with our subsidiaries that are denominated in foreign currencies; and

• $7.6 million gain on the sale of an investment. See Item 8, Note 7, Investments, for additional information.

Those items were partially offset by $20.7 million of interest expense primarily related to interest on our convertible notes.

Other income (expense), net for the year ended December 31, 2016 primarily consisted of the following: 

• $48.1 million of losses on fair value option investments;

• $15.9 million of interest expense primarily related to interest on our convertible notes; and

• $6.9 million in foreign currency losses.

The losses on fair value option investments consisted of a $35.4 million loss from our investment in Monster Holdings LP and a $12.8 million loss from our investment in Nearbuy Pte Ltd. ("Nearbuy,"). See Item 8, Note 7, Investments, for additional information.

Provision (Benefit) for Income Taxes

Comparison of the Years Ended December 31, 2018 and 2017:

Provision (benefit) for income taxes for the years ended December 31, 2018 and 2017 was as follows (dollars in thousands):

	Year Ended December 31,
	2018			2017			$ Change			% Change
Provision (benefit) for income taxes	$	(957	)	$	7,544		$	(8,501	)	(112.7	)%
Effective tax rate	(92.8		)%	20.9		%

Our U.S. Federal income tax rate was 21% for the year ended December 31, 2018 and was 35% for the year ended December 31, 2017. The primary factor impacting the effective tax rate for the year ended December 31, 2018 and 2017 was the pretax losses incurred in jurisdictions that have valuation allowances against their net deferred tax assets. We expect that our consolidated effective tax rate in future periods will continue to differ significantly from the U.S. federal income tax rate as a result of our tax obligations in jurisdictions with profits and valuation allowances in jurisdictions with losses. The effective tax rate for year ended December 31, 2018 also reflected a $6.4 million income tax benefit resulting from the impact of adopting Topic 606 on intercompany activity in certain foreign jurisdictions. See Item 8, Note 15, Income Taxes, for additional information relating to tax audits and assessments and regulatory and legal developments that my impact our business and results of operations in the future.

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Comparison of the Years Ended December 31, 2017 and 2016:

Provision (benefit) for income taxes for the years ended December 31, 2017 and 2016 was as follows (dollars in thousands):

	Year Ended December 31,
	2017			2016			$ Change		% Change
Provision (benefit) for income taxes	$	7,544		$	(5,316	)	$	12,862	241.9	%
Effective tax rate	20.9		%	3.1		%

The pretax losses incurred by our operations in jurisdictions that have valuation allowances against their net deferred tax assets, including the United States, was the primary factor impacting our effective tax rate for the years ended December 31, 2017 and 2016. See Item 8, Note 15, Income Taxes, for additional information.

Income (Loss) from Discontinued Operations

From November 2016 through March 2017, we exited our operations in 11 non-core countries and their results have been presented as discontinued operations for the years ended December 31, 2018, 2017 and 2016. See Item 8, Note 3, Discontinued Operations and Other Business Dispositions, for additional information about the dispositions and see Item 8, Note 10, Commitments and Contingencies, for information about indemnification obligations related to discontinued operations.

Non-GAAP Financial Measures

In addition to financial results reported in accordance with U.S. GAAP, we have provided the following non-GAAP financial measures: Adjusted EBITDA, free cash flow and foreign currency exchange rate neutral operating results. Those non-GAAP financial measures, which are presented on a continuing operations basis, are intended to aid investors in better understanding our current financial performance and prospects for the future as seen through the eyes of management. We believe that those non-GAAP financial measures facilitate comparisons with our historical results and with the results of peer companies who present similar measures (although other companies may define non-GAAP measures differently than we define them, even when similar terms are used to identify such measures). However, those non-GAAP financial measures are not intended to be a substitute for those reported in accordance with U.S. GAAP.

Adjusted EBITDA. Adjusted EBITDA is a non-GAAP performance measure that we define as net income (loss) from continuing operations excluding income taxes, interest and other non-operating items, depreciation and amortization, stock-based compensation, acquisition-related expense (benefit), net and other special charges and credits, including items that are unusual in nature or infrequently occurring. Our definition of Adjusted EBITDA may differ from similar measures used by other companies, even when similar terms are used to identify such measures. Adjusted EBITDA is a key measure used by our management and Board of Directors to evaluate operating performance, generate future operating plans and make strategic decisions for the allocation of capital. Accordingly, we believe that Adjusted EBITDA provides useful information to investors and others in understanding and evaluating our operating results in the same manner as our management and Board of Directors. However, Adjusted EBITDA is not intended to be a substitute for income (loss) from continuing operations.

We exclude stock-based compensation expense and depreciation and amortization because they are primarily non-cash in nature and we believe that non-GAAP financial measures excluding those items provide meaningful supplemental information about our operating performance and liquidity. Acquisition-related expense (benefit), net is comprised of the change in the fair value of contingent consideration arrangements and external transaction costs related to business combinations, primarily consisting of legal and advisory fees. The composition of our contingent consideration arrangements and the impact of those arrangements on our operating results vary over time based on a number of factors, including the terms of our business combinations and the timing of those transactions. For the years endedDecember 31, 2018, 2017 and 2016, special charges and credits included charges related to our restructuring plan. For the year ended December 31, 2018, special charges and credits also included a $34.6 million charge related to our patent litigation with IBM (see Item 8, Note 10, Commitments and Contingencies). For the year ended December 31, 2017, special charges and credits also included a $17.1 million credit related to the sale of intangible assets (see Item 8, Note 6, Goodwill and Other Intangible Assets). For the year ended December 31, 2016, special charges and credits also included gains from business dispositions of $11.4 million (see Item 8, Note 3,

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Discontinued Operations and Other Business Dispositions). We exclude special charges and credits from Adjusted EBITDA because we believe that excluding those items provides meaningful supplemental information about our core operating performance and facilitates comparisons with our historical results.

The following is a reconciliation of Adjusted EBITDA to the most comparable U.S. GAAP financial measure, Income (loss) from continuing operations for the years ended December 31, 2018, 2017 and 2016 (dollars in thousands):

	Year Ended December 31,
	2018			2017			2016
Income (loss) from continuing operations	$	1,988		$	28,601		$	(166,209	)
Adjustments:
Stock-based compensation (1)	64,821			80,950			109,523
Depreciation and amortization	115,828			137,827			135,909
Acquisition-related expense (benefit), net	655			48			5,650
Restructuring charges (1)	(136		)	18,828			40,438
IBM patent litigation	34,600			—			—
Gain on sale of intangible assets	—			(17,149		)	—
Gain on business dispositions	—			—			(11,399		)
Other (income) expense, net (1)	53,008			(6,710		)	71,289
Provision (benefit) for income taxes	(957		)	7,544			(5,318		)
Total adjustments	267,819			221,338			346,092
Adjusted EBITDA	$	269,807		$	249,939		$	179,883

(1) Represents stock-based compensation expense recorded within Selling, general and administrative, Cost of revenue and Marketing. Restructuring charges includes $0.8 million and $4.7 million of additional stock-based compensation for the years ended December 31, 2017 and 2016. Stock-based compensation recorded within Restructuring for the year ended December 31, 2018 was not material. Other income (expense), net includes $0.1 million, $0.2 million and $0.9 million of additional stock-based compensation for the year ended December 31, 2018, 2017 and 2016.

Free cash flow. Free cash flow is a non-GAAP liquidity measure that comprises net cash provided by operating activities from continuing operations less purchases of property and equipment and capitalized software from continuing operations. We use free cash flow to conduct and evaluate our business because, although it is similar to cash flow from continuing operations, we believe that it typically represents a more useful measure of cash flows because purchases of fixed assets, software developed for internal use and website development costs are necessary components of our ongoing operations. Free cash flow is not intended to represent the total increase or decrease in our cash balance for the applicable period.

Free cash flow has limitations due to the fact that it does not represent the residual cash flow available for discretionary expenditures. For example, free cash flow does not include cash payments for business acquisitions. In addition, free cash flow reflects the impact of the timing difference between when we are paid by customers and when we pay merchants and suppliers. Therefore, we believe it is important to view free cash flow as a complement to our entire consolidated statements of cash flows. For a reconciliation of free cash flow to the most comparable U.S. GAAP financial measure, see Liquidity and Capital Resources below.

Foreign currency exchange rate neutral operating results. Foreign currency exchange rate neutral operating results show current period operating results as if foreign currency exchange rates had remained the same as those in effect in the prior year period. Those measures are intended to facilitate comparisons to our historical performance. For a reconciliation of foreign currency exchange rate neutral operating results to the most comparable U.S. GAAP financial measures, see Results of Operations above.

Liquidity and Capital Resources

Our principal sources of liquidity are cash flows from operations, cash balances, which totaled $841.0 million as of December 31, 2018, and available borrowing capacity under our Amended and Restated Credit Agreement.

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Our net cash flows from operating, investing and financing activities from continuing operations for the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):

	Year Ended December 31,
	2018			2017			2016
Cash provided by (used in):
Operating activities (1)	$	190,855		$	130,545		$	130,245
Investing activities	(135,982		)	(25,323		)	(55,586		)
Financing activities	(84,417		)	(138,046		)	(14,665		)

(1) Prior period net cash provided by operating activities from continuing operations has been updated from $137.5 million and $128.9 million previously reported for the years ended December 31, 2017 and 2016, to reflect the adoption of ASU 2016-18 on January 1, 2018. See Item 8, Note 2, Summary of Significant Accounting Policies, for additional information on the adoption of ASU 2016-18.

Free cash flow is a non-GAAP liquidity measure that comprises net cash provided by operating activities from continuing operations, less purchases of property and equipment and capitalized software from continuing operations. Our free cash flow for the years ended December 31, 2018, 2017 and 2016 and reconciliations to the most comparable U.S. GAAP financial measure, Net cash provided by (used in) operating activities from continuing operations, for those periods are as follows (in thousands):

	Year Ended December 31,
	2018			2017			2016
Net cash provided by (used in) operating activities from continuing operations (1)	$	190,855		$	130,545		$	130,245
Purchases of property and equipment and capitalized software from continuing operations	(69,695		)	(59,158		)	(68,287		)
Free cash flow	$	121,160		$	71,387		$	61,958

(1) Net cash provided by operating activities from continuing operations and free cash flow have been updated from $137.5 million and $78.3 million previously reported, for the year ended December 31, 2017, and from $128.9 million and $60.6 million previously reported, for the year ended December 31, 2016 to reflect the adoption of ASU 2016-18 on January 1, 2018. See Item 8, Note 2, Summary of Significant Accounting Policies, for additional information on the adoption of ASU 2016-18.

Our revenue-generating transactions are primarily structured such that we collect cash up-front from customers and pay third-party merchants at a later date, either based on a fixed payment schedule or upon the customer's redemption of the related voucher. For merchants on fixed payment terms, we remit payments on an ongoing basis, generally bi-weekly, throughout the term of the merchant's offering. For purchases of merchandise inventory, our supplier payment terms generally range from net 30 to net 60 days. We have primarily paid merchants on fixed payment terms in North America and upon voucher redemption internationally. In the third quarter 2017, we began to increase our use of redemption payment terms with our North America merchants and we expect that trend to continue.

Our cash balances fluctuate significantly throughout the year based on many variables, including gross billings growth rates, the timing of payments to merchants and suppliers, seasonality and the mix of transactions between Goods and Local. For example, we typically generate strong cash inflows during the fourth quarter holiday season, driven primarily by our Goods category, followed by significant cash outflows in the following period when payments are made to inventory suppliers. We are currently developing and testing voucherless offerings that are linked to customer credit cards. For our card-linked offerings, we offer cash back on customers' credit card statements based on qualifying purchases with participating merchants. For those offerings, we typically remit payment to a card brand network within two weeks of the qualifying purchase for the customer's cash back incentive and then we collect from the merchant both our commission and reimbursement for the customer's cash back incentive, usually on a monthly basis. The working capital impact of card-linked offerings is less favorable to us than voucher transactions, for which we collect payment from customers at the time of sale and remit payment to merchants at a later date. As such, we expect that our cash flows will initially be adversely impacted to the extent that card-linked offerings begin to scale in future periods.

For the year ended December 31, 2018, our net cash provided by operating activities from continuing operations was $190.9 million, as compared with our $2.0 millionincome from continuing operations. That difference was primarily attributable to $206.8 million of non-cash items, including depreciation and amortization and stock-based compensation. The difference between our net cash provided by operating activities and our income from continuing operations due to non-cash items was partially offset by an $17.9 million net decrease from changes in working capital and other assets and liabilities. The working capital impact was primarily related to the seasonal timing of payments to inventory

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suppliers and also includes $42.1 million of the payment to IBM related to the settlement of our patent litigation as described in Item 8, Note 10, Commitments and Contingencies.

For the year ended December 31, 2017, our net cash provided by operating activities from continuing operations was $130.5 million, as compared with a $28.6 million income from continuing operations. That difference was primarily attributable to $209.1 million of non-cash items, including depreciation and amortization, and stock-based compensation, and the gain on sale of intangible assets. The difference between net cash provided by operating activities and our income from continuing operations due to non-cash items was partially offset by an$107.1 million decrease from changes in working capital and other assets and liabilities. The working capital impact was primarily related to the seasonal timing of payments to inventory suppliers and payments related to our restructuring activities.

For the year ended December 31, 2016, our net cash provided by operating activities from continuing operations was $130.2 million, as compared with a $166.2 million loss from continuing operations. That difference was primarily due to $289.1 million of non-cash items, including depreciation and amortization, stock-based compensation and losses from minority investments carried at fair value.

Our net cash used in investing activities from continuing operations was $136.0 million, $25.3 million and $55.6 million for the years ended December 31, 2018, 2017 and 2016. For the year ended December 31, 2018, our net cash used in investing activities from continuing operations included net cash paid for a business acquisition of $58.1 million, purchases of property and equipment and capitalized software of $69.7 million and net cash paid of $18.3 million for acquisitions of intangible assets, including $15.4 million related to the settlement of our IBM patent litigation as described in Item 8, Note 10, Commitments and Contingencies. For the year ended December 31, 2017, our net cash used in investing activities from continuing operations included purchases of property and equipment and capitalized software of $59.2 million, proceeds of $18.3 million from the sale of intangible assets and proceeds of $16.6 million from sales and maturities of investments. For the year ended December 31, 2016, our net cash used in investing activities from continuing operations included purchases of property and equipment and capitalized software of $68.3 million and net cash acquired from business combinations of $14.5 million.

Our net cash used in financing activities was $84.4 million, $138.0 million and $14.7 million for the years endedDecember 31, 2018, 2017 and 2016. For the year ended December 31, 2018, net cash used in financing activities included $33.0 million in payments of capital lease obligations, $24.1 million in taxes paid related to net share settlements of stock-based compensation awards, $9.6 million in purchases of treasury stock under our share repurchase program, and an $8.4 million payment of a financing obligation related to a business acquisition. For the year ended December 31, 2017, net cash used in financing activities included $61.2 million in purchases of common stock under our share repurchase program, $34.0 million in payments of capital lease obligations and $27.7 million in taxes paid related to net share settlements of stock-based compensation awards. For the year ended December 31, 2016, net cash used in financing activities included $165.4 million in purchases of common stock under our share repurchase program, $59.2 million for the purchase of convertible note hedges, $30.6 million in payments of capital lease obligations and $29.8 million in taxes paid related to net share settlements of stock-based compensation awards, partially offset by $250.0 million in proceeds from issuance of our senior convertible notes described below and $35.5 million of proceeds from the issuance of warrants.

Our Amended and Restated Credit Agreement provides for aggregate principal borrowings of up to $250.0 million and matures in June 2019. We intend to refinance our Amended and Restated Credit Agreement in the first half of 2019. As of December 31, 2018, we had no borrowings under our Amended and Restated Credit Agreement and were in compliance with all covenants. See Item 8, Note 9, Financing Arrangements, for additional information.

As of December 31, 2018, we had $332.9 million in cash held by our international subsidiaries, which is primarily denominated in Euros, British Pounds Sterling, Canadian dollars, and, to a lesser extent, Australian dollars and Japanese yen. In general, it is our practice and intention to re-invest the earnings of our non-U.S. subsidiaries in those operations. We have not, nor do we anticipate the need to, repatriate funds to the United States to satisfy domestic liquidity needs arising in the ordinary course of business.

In May 2018, the Board of Directors authorized us to repurchase up to $300.0 million of our common stock under a new share repurchase program. Our prior share repurchase program expired in April 2018. Upon its expiration, up to $135.2 million of our common stock remained available for purchase under that prior share repurchase program. During the year ended December 31, 2018, we repurchased 3,252,886 shares for an aggregate purchase price of $10.0 million (including fees and commissions) under the new repurchase program. As of December 31, 2018, up to $290.0 million of common stock remained available for purchase under the new program. The timing and amount of

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share repurchases, if any, will be determined based on market conditions, limitations under our Amended and Restated Credit Agreement, share price and other factors, and the program may be terminated at any time. Repurchases will be made in compliance with SEC rules and other legal requirements and may be made, in part, under a Rule 10b5-1 plan, which permits share repurchases when we might otherwise be precluded from doing so.

In April 2016, we issued convertible notes with an aggregate principal amount of $250.0 million. We received net proceeds of $243.2 million from the issuance of the Notes. We have used the proceeds from the Notes for general corporate purposes, including repurchases of shares of our common stock. Additionally, we entered into note hedge and warrant transactions with certain bank counterparties that are designed to offset, in part, the potential dilution from conversion of the Notes. See Item 8, Note 9, Financing Arrangements, for additional information.

Our cash balances and cash flows generated from our operations may be used to fund strategic investments, business acquisitions, working capital needs, investments in technology, marketing and share repurchases. Additionally, we have the ability to borrow funds under our Amended and Restated Credit Agreement. We could also seek to raise additional financing, if available on terms that we believe are favorable, to increase the amount of liquid funds that we can access for acquisitions, share repurchases or other strategic investment opportunities. Although we can provide no assurances, we believe that our cash balances and cash generated from operations should be sufficient to meet our working capital requirements and capital expenditures for at least the next twelve months.

Contractual Obligations and Commitments

The following table summarizes (in thousands) our future contractual obligations and commitments as of December 31, 2018. The table below excludes $39.9 million of non-current liabilities for unrecognized tax benefits, including interest and penalties, as of December 31, 2018. We cannot make a reasonable estimate of the period of cash settlement for the tax positions classified as non-current liabilities.

	Payments due by period
	Total		2019		2020		2021		2022		2023		Thereafter
Capital lease obligations (1)	$	31,274	$	18,169	$	7,634	$	4,784	$	687	$	—	$	—
Operating lease obligations (2)	170,199		32,533		31,116		26,876		26,097		21,944		31,633
Convertible senior notes (3)	282,500		8,125		8,125		8,125		258,125		—		—
Purchase obligations (4)	27,366		13,266		7,300		3,400		3,400		—		—
Total	$	511,339	$	72,093	$	54,175	$	43,185	$	288,309	$	21,944	$	31,633

(1) Capital lease obligations include both principal and interest components of future minimum capital lease payments.

(2) Operating lease obligations are primarily for office facilities and are noncancelable. Certain leases contain periodic rent escalation adjustments and renewal and expansion options. Operating lease obligations expire at various dates with the latest maturity in 2026.

(3) Represents the principal amount and related interest on our convertible senior notes.

(4) Purchase obligations primarily represent noncancelable contractual obligations related to information technology products and services.

Off-Balance Sheet Arrangements

We did not have any off-balance sheet arrangements as of December 31, 2018.

Critical Accounting Policies and Estimates

Management's Discussion and Analysis of Financial Condition and Results of Operations is based upon our consolidated financial statements, which have been prepared in accordance with U.S. GAAP. Our significant accounting policies are discussed in Item 8, Note 2, Summary of Significant Accounting Policies, in the notes to the consolidated financial statements.

The preparation of consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts and classifications of assets and liabilities, revenue and expenses, and related disclosure of contingent liabilities. Management bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources.

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Actual results may differ from those estimates under different assumptions or conditions.

We believe that the estimates and assumptions related to revenue recognition, impairment assessments of goodwill and long-lived assets, income taxes and fair value option investments have the greatest potential impact on our consolidated financial statements. Therefore, we consider these to be our critical accounting policies and estimates.

Revenue Recognition

Refer to Item 8, Note 2, Summary of Significant Accounting Policies, and Note 13, Revenue Recognition, for information about our revenue recognition accounting policies, including estimates of our refund liabilities.

Impairment Assessments of Goodwill and Long-Lived Assets

Refer to Item 8, Note 2, Summary of Significant Accounting Policies, and Note 6, Goodwill and Other Intangible Assets, for information about our accounting policies relating to goodwill and impairment of long-lived assets. Additional information about those accounting policies and estimates is set forth in the following paragraphs.

When determining fair values in impairment tests, we use one of the following recognized valuation methods: the income approach (including discounted cash flows), the market approach and the cost approach. Our significant estimates in those fair value measurements include identifying business factors such as size, growth, profitability, risk and return on investment and assessing comparable revenue and earnings multiples. Further, when measuring fair value based on discounted cash flows, we make assumptions about risk-adjusted discount rates; rates of increase in revenue, cost of revenue and operating expenses; weighted average cost of capital; rates of long-term growth; and income tax rates. Valuations are performed by management or third-party valuation specialists under management's supervision, where appropriate. We believe that the estimated fair values used in impairment tests are based on reasonable assumptions that marketplace participants would use. However, such assumptions are inherently uncertain and actual results could differ from those estimates.

Our three reporting units as of October 1, 2018 were North America, EMEA and Asia Pacific. There was no impairment of goodwill for any reporting unit because the fair values of the reporting units exceeded their carrying values.

We updated our reporting segments in the first quarter of 2017. As a result of the change in segments, we combined our Northern EMEA, Southern EMEA and Central EMEA reporting units into a single EMEA reporting unit, which is one level below the International segment. As a result of the change in reporting units, we performed a qualitative assessment of potential goodwill impairment for the new EMEA reporting unit and performed separate qualitative assessments of potential goodwill impairment for the Northern EMEA, Southern EMEA and Central EMEA previous reporting units immediately prior to the change. We also performed a qualitative assessment of potential goodwill impairment for the remainder of our Asia Pacific reporting unit following the dispositions of businesses in that reporting unit during the first quarter of 2017. Based on those assessments, which considered current market conditions, recent business performance and the amounts by which fair values exceeded carrying values in quantitative impairment tests performed as of October 1, 2016, we determined that the likelihood of a goodwill impairment did not reach the more-likely-than not threshold specified in U.S. GAAP for any of the reporting units that were evaluated. Accordingly, we concluded that goodwill related to those reporting units was not impaired and further quantitative testing was not required to be performed. In addition, we sold all of the operations of our Latin America reporting unit in the first quarter of 2017 and the goodwill of that reporting unit was included in the net book value that was derecognized. See Item 8, Note 19, Segment Information, for information on our change in reporting segments and Item 8, Note 3, Discontinued Operations and Other Business Dispositions, for information about the dispositions of operations in Asia and Latin America.

Future changes in our assumptions or the interrelationship of the assumptions described above may negatively impact future valuations. In future measurements of fair value, adverse changes in assumptions could result in impairments of goodwill or long-lived assets that would require non-cash charges to the consolidated statements of operations and may have a material effect on our financial condition and operating results.

Income Taxes

Refer to Item 8, Note 2, Summary of Significant Accounting Policies, and Note 15, Income Taxes, for information about our income tax accounting policies.

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Fair Value Option Investments

Refer to Item 8, Note 7, Investments, for information about the fair value measurements of our fair value option investments. Additional information about those fair value measurements is set forth in the following paragraphs.

If Monster LP or Nearbuy seek additional financing in order to fund their growth strategies, such financing transactions may result in dilution of our ownership stakes and they may occur at lower valuations, which could significantly decrease the fair values of our investments in those entities. For example, in December 2016, Monster LP issued a new class of partnership units (Class A-1) to its controlling investor group and a new investor for total proceeds of $65.0 million. The fair value of Monster LP implied by the terms of that transaction was lower than its estimated fair value in previous periods, which resulted in a significant decrease in the fair value of our investment for the year ended December 31, 2016. Additionally, if Monster LP or Nearbuy are unable to obtain any such financing, those entities could need to significantly reduce their spending in order to fund their operations. Such actions likely would result in reduced growth forecasts, which also could significantly decrease the fair values of our investments in those entities.

Estimating the fair values of our investments requires significant judgment regarding the assumptions that market participants would use in pricing those assets. As the fair value measurements involve significant unobservable inputs, such as cash flow projections and discount rates, they are classified as Level 3 within the fair value hierarchy. Future changes in judgment about the related fair value inputs, including changes that may result from any subsequent financing transactions undertaken by those investees, could result in significant increases or decreases in fair value that would be recognized in earnings.

Recently Issued Accounting Standards

For a description of recently issued accounting standards, please see Item 8, Note 2, Summary of Significant Accounting Policies, to the consolidated financial statements of this Annual Report on Form 10-K.

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ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We have operations both within the United States and internationally, and we are exposed to market risks in the ordinary course of our business, including the effect of foreign currency fluctuations, interest rate changes and inflation. Information relating to quantitative and qualitative disclosures about these market risks is set forth below.

Foreign Currency Exchange Risk

We transact business in various foreign currencies other than the U.S. dollar, principally the euro, British pound sterling, Canadian dollar and Australian dollar, which exposes us to foreign currency risk. For the year ended December 31, 2018, we derived approximately 37.8% of our revenue from our International segment. Revenue and related expenses generated from our international operations are generally denominated in the local currencies of the corresponding countries. The functional currencies of our subsidiaries that either operate or support these markets are generally the same as the corresponding local currencies. However, the results of operations of, and certain of our intercompany balances associated with, our international operations are exposed to foreign currency exchange rate fluctuations. Upon consolidation, as exchange rates vary, our revenue and other operating results may differ materially from expectations, and we may record significant gains or losses on the re-measurement of intercompany balances.

We assess our foreign currency exchange risk based on hypothetical changes in rates utilizing a sensitivity analysis that measures the potential impact on working capital based on a 10% change (increase and decrease) in currency rates. We use a current market pricing model to assess the changes in the value of the U.S. dollar on foreign currency denominated monetary assets and liabilities. The primary assumption used in this model is a hypothetical 10% weakening or strengthening of the U.S. dollar against those currency exposures as of December 31, 2018 and 2017.

As of December 31, 2018, our net working capital deficit (defined as current assets less current liabilities) from subsidiaries that are subject to foreign currency translation risk was $20.8 million. The potential increase in this working capital deficit from a hypothetical 10% adverse change in quoted foreign currency exchange rates would be $2.1 million. This compares to a $21.5 million working capital deficit subject to foreign currency exposure as of December 31, 2017, for which a 10% adverse change would have resulted in a potential increase in this working capital deficit of $2.2 million.

Interest Rate Risk

Our cash balance as of December 31, 2018 consists of bank deposits, so exposure to market risk for changes in interest rates is limited. In April 2016, we issued convertible notes with an aggregate principal amount of $250.0 million (see item 8, Note 9, Financing Arrangements). The convertible notes bear interest at a fixed rate, so we have no financial statement impact from changes in interest rates. However, changes in market interest rates impact the fair value of the convertible notes along with other variables such as our credit spreads and the market price and volatility of our common stock. In June 2016, we entered into the Amended and Restated Credit Agreement that provides for aggregate principal borrowings of up to $250.0 million. As of December 31, 2018, there were no borrowings outstanding under the Amended and Restated Credit Agreement. Because the Amended and Restated Credit Agreement bears interest at a variable rate, we are exposed to market risk relating to changes in interest rates if we borrow under the Amended and Restated Credit Agreement. We also have $29.7 million of capital lease obligations. We do not believe that the interest rate risk on the capital lease obligations is significant.

Impact of Inflation

We believe that our results of operations are not materially impacted by moderate changes in the inflation rate. Inflation and changing prices did not have a material effect on our business, financial condition or results of operations for the year ended December 31, 2018.

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ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Table of Contents

Groupon, Inc.

Consolidated Financial Statements

As of December 31, 2018 and 2017 and for the Years Ended December 31, 2018, 2017 and 2016

	Page
Reports of Independent Registered Public Accounting Firms	75
Consolidated Balance Sheets	77
Consolidated Statements of Operations	78
Consolidated Statements of Comprehensive Income (Loss)	79
Consolidated Statements of Stockholders' Equity	80
Consolidated Statements of Cash Flows	82
Notes to Consolidated Financial Statements	84

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the stockholders and the Board of Directors of Groupon, Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Groupon, Inc. and subsidiaries (the "Company") as of December 31, 2018 and 2017, the related consolidated statements of operations, comprehensive income (loss), stockholders' equity, and cash flows for each of the two years in the period ended December 31, 2018, and the related notes and the schedule listed in the Index at Item 15(2) (collectively referred to as the "financial statements"). In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2018 and 2017, and the results of its operations and its cash flows for each of the two years in the period ended December 31, 2018, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 12, 2019, expressed an unqualified opinion on the Company's internal control over financial reporting.

Adoption of New Revenue Recognition Accounting Standard

As discussed in Note 13 to the financial statements, the Company has changed its method of accounting for revenue transactions in 2018 due to the adoption of the guidance in ASC Topic 606, Revenue from Contracts with Customers.

Basis for Opinion

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures to respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

/s/ Deloitte & Touche LLP

Chicago, Illinois

February 12, 2019

We have served as the Company's auditor since 2017.

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Report of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders of Groupon, Inc.

We have audited the accompanying consolidated statements of operations, comprehensive income (loss), stockholders' equity, and cash flows for the year ended December 31, 2016. Our audit also included the financial statement schedule listed in Item 15(2) for 2016. These financial statements and schedule are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements and schedule based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audit provides a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Groupon, Inc. at December 31, 2016, and the consolidated results of its operations, and its cash flows for the year ended December 31, 2016, in conformity with U.S. generally accepted accounting principles. Also, in our opinion, the related financial statement schedule when considered in relation to the basic consolidated financial statements taken as a whole, presents fairly in all material respects the information set forth therein.

As discussed in Note 2 to the consolidated financial statements, on January 1, 2016, the Company adopted the amendments to the FASB Accounting Standards Codification resulting from Accounting Standards Update No. 2016-09, "Compensation - Stock Compensation (Topic 718) - Improvements to Employee Share-Based Payment Accounting."

/s/ Ernst & Young LLP

Chicago, Illinois

February 15, 2017

except for Notes 1, 3 and 19, as to which the date is May 17, 2017, and Note 2, as to which the date is February 12, 2019

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GROUPON, INC.

CONSOLIDATED BALANCE SHEETS

(in thousands, except share and per share amounts)

	December 31,
	2018			2017
Assets
Current assets:
Cash and cash equivalents	$	841,021		$	880,129
Accounts receivable, net	69,493			98,294
Prepaid expenses and other current assets	88,115			94,025
Total current assets	998,629			1,072,448
Property, equipment and software, net	143,117			151,145
Goodwill	325,491			286,989
Intangible assets, net	45,401			19,196
Investments (including $84,242 and $109,751 at December 31, 2018 and December 31, 2017 at fair value)	108,515			135,189
Other non-current assets	20,989			12,538
Total Assets	$	1,642,142		$	1,677,505
Liabilities and Equity
Current liabilities:
Accounts payable	$	38,359		$	31,968
Accrued merchant and supplier payables	651,781			770,335
Accrued expenses and other current liabilities	267,034			331,196
Total current liabilities	957,174			1,133,499
Convertible senior notes, net	201,669			189,753
Other non-current liabilities	100,688			102,408
Total Liabilities	1,259,531			1,425,660
Commitments and contingencies (see Note 10)
Stockholders' Equity
Common stock, par value $0.0001 per share, 2,010,000,000 shares authorized; 760,939,440 shares issued and 569,084,312 shares outstanding at December 31, 2018; 748,541,862 shares issued and 559,939,620 shares outstanding at December 31, 2017	76			75
Additional paid-in capital	2,234,560			2,174,708
Treasury stock, at cost, 191,855,128 and 188,602,242 shares at December 31, 2018 and December 31, 2017	(877,491		)	(867,450		)
Accumulated deficit	(1,010,499		)	(1,088,204		)
Accumulated other comprehensive income	34,602			31,844
Total Groupon, Inc. Stockholders' Equity	381,248			250,973
Noncontrolling interests	1,363			872
Total Equity	382,611			251,845
Total Liabilities and Equity	$	1,642,142		$	1,677,505

See Notes to Consolidated Financial Statements.

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GROUPON, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except share and per share amounts)

	Year Ended December 31,
	2018			2017			2016
Revenue:
Service	$	1,205,487		$	1,266,452		$	1,206,441
Product	1,431,259			1,577,425			1,807,174
Total revenue	2,636,746			2,843,877			3,013,615
Cost of revenue:
Service	120,077			160,810			150,031
Product	1,196,068			1,349,206			1,582,931
Total cost of revenue	1,316,145			1,510,016			1,732,962
Gross profit	1,320,601			1,333,861			1,280,653
Operating expenses:
Marketing	395,737			400,918			352,175
Selling, general and administrative	870,961			901,829			999,677
Restructuring charges	(136		)	18,828			40,438
Gain on sale of intangible assets	—			(17,149		)	—
Gain on business dispositions	—			—			(11,399		)
Total operating expenses	1,266,562			1,304,426			1,380,891
Income (loss) from operations	54,039			29,435			(100,238		)
Other income (expense), net	(53,008		)	6,710			(71,289		)
Income (loss) from continuing operations before provision (benefit) for income taxes	1,031			36,145			(171,527		)
Provision (benefit) for income taxes	(957		)	7,544			(5,318		)
Income (loss) from continuing operations	1,988			28,601			(166,209		)
Income (loss) from discontinued operations, net of tax	—			(1,974		)	(17,114		)
Net income (loss)	1,988			26,627			(183,323		)
Net income attributable to noncontrolling interests	(13,067		)	(12,587		)	(11,264		)
Net income (loss) attributable to Groupon, Inc.	$	(11,079	)	$	14,040		$	(194,587	)
Basic net income (loss) per share (1):
Continuing operations	$	(0.02	)	$	0.03		$	(0.31	)
Discontinued operations	0.00			(0.00		)	(0.03		)
Basic net income (loss) per share	$	(0.02	)	$	0.03		$	(0.34	)
Diluted net income (loss) per share (1):
Continuing operations	$	(0.02	)	$	0.03		$	(0.31	)
Discontinued operations	0.00			(0.01		)	(0.03		)
Diluted net income (loss) per share	$	(0.02	)	$	0.02		$	(0.34	)
Weighted average number of shares outstanding (1):
Basic	566,511,108			559,367,075			576,354,258
Diluted	566,511,108			568,418,371			576,354,258

(1) The structure of our common stock changed during the year ended December 31, 2016. Refer to Note 11, Stockholders' Equity, and Note 18, Income (Loss) Per Share, for additional information.

See Notes to Consolidated Financial Statements.

78

GROUPON, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(in thousands)

	Year Ended December 31,
	2018			2017			2016
Income (loss) from continuing operations	$	1,988		$	28,601		$	(166,209	)
Other comprehensive income (loss) from continuing operations:
Net change in unrealized gain (loss) on foreign currency translation adjustment	3,332			(10,776		)	8,361
Net change in unrealized gain (loss) on defined benefit pension plan	—			585			928
Available-for-sale securities:
Net unrealized gain (loss) during the period	(841		)	(1,109		)	(70		)
Reclassification adjustment for realized (gain) loss on investment included in income (loss) from continuing operations	106			1,603			—
Net change in unrealized gain (loss) on available-for-sale securities (net of tax effect of $34, $0 and $43 for the years ended December 31, 2018, 2017 and 2016)	(735		)	494			(70		)
Other comprehensive income (loss) from continuing operations	2,597			(9,697		)	9,219
Comprehensive income (loss) from continuing operations	4,585			18,904			(156,990		)
Income (loss) from discontinued operations	—			(1,974		)	(17,114		)
Other comprehensive income (loss) from discontinued operations - Foreign currency translation adjustments:
Net unrealized gain (loss) during the period	—			(1,793		)	(9,305		)
Reclassification adjustment included in income (loss) from discontinued operations	—			(14,718		)	6,932
Net change in unrealized gain (loss)	—			(16,511		)	(2,373		)
Comprehensive income (loss) from discontinued operations	—			(18,485		)	(19,487		)
Comprehensive income (loss)	4,585			419			(176,477		)
Comprehensive income attributable to noncontrolling interests	(13,067		)	(12,587		)	(11,264		)
Comprehensive income (loss) attributable to Groupon, Inc.	$	(8,482	)	$	(12,168	)	$	(187,741	)

See Notes to Consolidated Financial Statements.

79

GROUPON, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

(in thousands, except share amounts)

	Groupon, Inc. Stockholders' Equity
	Common Stock (1)					Additional Paid-In Capital			Treasury Stock					Accumulated Deficit			Accumulated Other Comprehensive Income (Loss)			Total Groupon, Inc. Stockholders' Equity			Non-controlling Interests			Total Equity
	Shares		Amount						Shares		Amount
Balance at December 31, 2015	719,787,422		$	72		$	1,964,453		(128,468,165	)	$	(645,041	)	$	(901,292	)	$	51,206		$	469,398		$	1,189		$	470,587
Cumulative effect of change in accounting principle	—		—			—			—		—			(3,131		)	—			(3,131		)	—			(3,131		)
Net income (loss)	—		—			—			—		—			(194,587		)	—			(194,587		)	11,264			(183,323		)
Foreign currency translation	—		—			—			—		—			—			5,988			5,988			—			5,988
Pension liability adjustment, net of tax	—		—			—			—		—			—			928			928			—			928
Unrealized gain (loss) on available-for-sale securities, net of tax	—		—			—			—		—			—			(70		)	(70		)	—			(70		)
Forfeitures of unvested restricted stock	(196,968	)	—			—			—		—			—			—			—			—			—
Exercise of stock options	491,483		—			620			—		—			—			—			620			—			620
Vesting of restricted stock units	22,698,324		3			(3		)	—		—			—			—			—			—			—
Shares issued under employee stock purchase plan	1,669,782		—			4,358			—		—			—			—			4,358			—			4,358
Tax withholdings related to net share settlements of stock-based compensation awards	(7,918,272	)	(1		)	(31,160		)	—		—			—			—			(31,161		)	—			(31,161		)
Stock-based compensation on equity-classified awards	—		—			131,114			—		—			—			—			131,114			—			131,114
Equity component of the convertible senior notes, net of tax and issuance costs	—		—			67,014			—		—			—			—			67,014			—			67,014
Purchase of convertible note hedges	—		—			(59,163		)	—		—			—			—			(59,163		)	—			(59,163		)
Issuance of warrants	—		—			35,495			—		—			—			—			35,495			—			35,495
Purchases of treasury stock	—		—			—			(43,227,743	)	(162,383		)	—			—			(162,383		)	—			(162,383		)
Distributions to noncontrolling interest holders	—		—			—			—		—			—			—			—			(11,811		)	(11,811		)
Balance at December 31, 2016	736,531,771		$	74		$	2,112,728		(171,695,908	)	$	(807,424	)	$	(1,099,010	)	$	58,052		$	264,420		$	642		$	265,062
Cumulative effect of change in accounting principle	—		—			—			—		—			(3,234		)	—			(3,234		)	—			(3,234		)
Net income (loss)	—		—			—			—		—			14,040			—			14,040			12,587			26,627
Foreign currency translation	—		—			—			—		—			—			(27,287		)	(27,287		)	—			(27,287		)
Pension liability adjustment, net of tax	—		—			—			—		—			—			585			585			—			585
Unrealized gain (loss) on available-for-sale securities, net of tax	—		—			—			—		—			—			494			494			—			494
Exercise of stock options	102,803		—			230			—		—			—			—			230			—			230
Vesting of restricted stock units and performance share units	16,596,562		2			(2		)	—		—			—			—			—			—			—
Shares issued under employee stock purchase plan	1,879,656		—			5,283			—		—			—			—			5,283			—			5,283
Tax withholdings related to net share settlements of stock-based compensation awards	(6,568,930	)	(1		)	(27,187		)	—		—			—			—			(27,188		)	—			(27,188		)
Stock-based compensation on equity-classified awards	—		—			83,656			—		—			—			—			83,656			—			83,656

80

	Groupon, Inc. Stockholders' Equity
	Common Stock (1)				Additional Paid-In Capital			Treasury Stock					Accumulated Deficit			Accumulated Other Comprehensive Income (Loss)			Total Groupon, Inc. Stockholders' Equity			Non-controlling Interests			Total Equity
	Shares		Amount					Shares		Amount
Purchases of treasury stock	—		—		—			(16,906,334	)	(60,026		)	—			—			(60,026		)	—			(60,026		)
Distributions to noncontrolling interest holders	—		—		—			—		—			—			—			—			(12,357		)	(12,357		)
Balance at December 31, 2017	748,541,862		$	75	$	2,174,708		(188,602,242	)	$	(867,450	)	$	(1,088,204	)	$	31,844		$	250,973		$	872		$	251,845
Cumulative effect of change in accounting principle, net of tax	—		—		—			—		—			88,945			—			88,945			—			88,945
Reclassification for impact of U.S. tax rate change	—		—		—			—		—			(161		)	161			—			—			—
Net income (loss)	—		—		—			—		—			(11,079		)	—			(11,079		)	13,067			1,988
Foreign currency translation	—		—		—			—		—			—			3,332			3,332			—			3,332
Unrealized gain (loss) on available-for-sale securities, net of tax	—		—		—			—		—			—			(735		)	(735		)	—			(735		)
Exercise of stock options	672,793		—		81			—		—			—			—			81			—			81
Vesting of restricted stock units and performance share units	14,264,895		1		(1		)	—		—			—			—			—			—			—
Shares issued under employee stock purchase plan	1,621,061				5,634			—		—			—			—			5,634			—			5,634
Shares issued to settle liability-classified awards	1,240,379		—		6,436			—		—			—			—			6,436			—			6,436
Tax withholdings related to net share settlements of stock-based compensation awards	(5,401,550	)	—		(22,709		)	—		—			—			—			(22,709		)	—			(22,709		)
Stock-based compensation on equity-classified awards	—		—		70,411			—		—			—			—			70,411			—			70,411
Purchases of treasury stock	—		—		—			(3,252,886	)	(10,041		)	—			—			(10,041		)	—			(10,041		)
Distributions to noncontrolling interest holders	—		—		—			—		—			—			—			—			(12,576		)	(12,576		)
Balance at December 31, 2018	760,939,440		$	76	$	2,234,560		(191,855,128	)	$	(877,491	)	$	(1,010,499	)	$	34,602		$	381,248		$	1,363		$	382,611

(1) The structure of our common stock changed during the year ended December 31, 2016. Refer to Note 11, Stockholders' Equity, and Note 18, Income (Loss) Per Share, for additional information.

See Notes to Consolidated Financial Statements.

81

GROUPON, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Year Ended December 31,
	2018			2017			2016
Operating activities
Net income (loss)	$	1,988		$	26,627		$	(183,323	)
Less: Income (loss) from discontinued operations, net of tax	—			(1,974		)	(17,114		)
Income (loss) from continuing operations	1,988			28,601			(166,209		)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization of property, equipment and software	101,330			114,795			116,961
Amortization of acquired intangible assets	14,498			23,032			18,948
Stock-based compensation	64,821			82,044			115,123
Gain on business dispositions	—			—			(11,399		)
Gain on sale of intangible assets	—			(17,149		)	—
Gain on sale of investment	—			(7,624		)	—
Restructuring-related long-lived asset impairment	—			—			328
Impairments of investments	10,156			2,944			—
Deferred income taxes	(5,000		)	603			(10,448		)
(Gain) loss, net from changes in fair value of contingent consideration	—			—			4,092
(Gain) loss from changes in fair value of investments	9,064			(382		)	48,141
Amortization of debt discount on convertible senior notes	11,916			10,758			7,376
Change in assets and liabilities, net of acquisitions and dispositions:
Accounts receivable	32,057			(18,793		)	(16,584		)
Prepaid expenses and other current assets	7,166			4,074			35,043
Accounts payable	5,805			(199		)	5,121
Accrued merchant and supplier payables	(45,268		)	(29,823		)	26,729
Accrued expenses and other current liabilities	(31,430		)	(40,361		)	(32,124		)
Other, net	13,752			(21,975		)	(10,853		)
Net cash provided by (used in) operating activities from continuing operations	190,855			130,545			130,245
Net cash provided by (used in) operating activities from discontinued operations	—			(2,418		)	(11,823		)
Net cash provided by (used in) operating activities	190,855			128,127			118,422
Investing activities
Purchases of property and equipment and capitalized software	(69,695		)	(59,158		)	(68,287		)
Cash derecognized upon dispositions of subsidiaries	—			—			(1,128		)
Proceeds from sale of intangible assets	1,500			18,333			—
Proceeds from sales and maturities of investments	8,594			16,561			1,685
Acquisitions of businesses, net of acquired cash	(58,119		)	—			14,539
Acquisitions of intangible assets and other investing activities	(18,262		)	(1,059		)	(2,395		)
Net cash provided by (used in) investing activities from continuing operations	(135,982		)	(25,323		)	(55,586		)
Net cash provided by (used in) investing activities from discontinued operations	—			(9,548		)	(1,900		)
Net cash provided by (used in) investing activities	(135,982		)	(34,871		)	(57,486		)
Financing activities
Proceeds from issuance of convertible senior notes	—			—			250,000
Issuance costs for convertible senior notes and revolving credit agreement	—			—			(8,147		)
Purchase of convertible note hedges	—			—			(59,163		)
Proceeds from issuance of warrants	—			—			35,495
Payments for purchases of treasury stock	(9,585		)	(61,233		)	(165,357		)
Taxes paid related to net share settlements of stock-based compensation awards	(24,105		)	(27,681		)	(29,777		)
Proceeds from stock option exercises and employee stock purchase plan	5,715			5,513			4,978
Distributions to noncontrolling interest holders	(12,576		)	(12,357		)	(11,811		)
Payments of capital lease obligations	(33,023		)	(34,025		)	(30,598		)
Payments of contingent consideration related to acquisitions	(1,815		)	(7,790		)	(285		)
Payment of financing obligation related to acquisition	(8,391		)	—			—
Other financing activities	(637		)	(473		)	—
Net cash provided by (used in) financing activities	(84,417		)	(138,046		)	(14,665		)
Effect of exchange rate changes on cash, cash equivalents and restricted cash, including cash classified within current assets of discontinued operations	(11,209		)	26,499			(6,718		)
Net increase (decrease) in cash, cash equivalents and restricted cash, including cash classified within current assets of discontinued operations	(40,753		)	(18,291		)	39,553
Less: Net increase (decrease) in cash classified within current assets of discontinued operations	—			(28,866		)	(186		)
Net increase (decrease) in cash, cash equivalents and restricted cash	(40,753		)	10,575			39,739
Cash, cash equivalents and restricted cash, beginning of period	885,481			874,906			835,167
Cash, cash equivalents and restricted cash, end of period	$	844,728		$	885,481		$	874,906

See Notes to Consolidated Financial Statements.

82

	Year Ended December 31,
	2018			2017			2016
Supplemental disclosure of cash flow information
Income tax payments (refunds) for continuing operations	$	2,781		$	8,646		$	(7,208	)
Income tax payments (refunds) for discontinued operations	—			(56		)	2,953
Cash paid for interest	9,556			9,425			1,185
Non-cash investing and financing activities
Continuing operations:
Equipment acquired under capital lease obligations	18,064			28,271			21,611
Leasehold improvements funded by lessor	557			402			4,990
Liability for purchases of treasury stock	456			—			1,207
Increase (decrease) in liabilities related to purchases of property and equipment and capitalized software	(482		)	972			3,855
Investments acquired in connection with business dispositions	—			2,022			13,507
Contingent consideration liability incurred in connection with acquisition of business	1,529			—			—

See Notes to Consolidated Financial Statements.

83

GROUPON, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

Company Information

Groupon, Inc. and subsidiaries, which commenced operations in October 2008, operates online local commerce marketplaces throughout the world that connect merchants to consumers by offering goods and services, generally at a discount. Customers access those marketplaces through our websites, primarily localized groupon.com sites in many countries, and our mobile applications.

Our operations are organized into two segments: North America and International. See Note 19, Segment Information.

In connection with a strategic initiative to optimize our global footprint, we sold our operations in 11 countries and ceased operations in another country between November 2016 and March 2017. The financial results of those operations have been presented as discontinued operations in the consolidated financial statements for the years ended December 31, 2017 and 2016. See Note 3, Discontinued Operations and Other Business Dispositions, for additional information.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation

The consolidated financial statements include the accounts of Groupon, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The consolidated financial statements were prepared in accordance with U.S. GAAP and include the assets, liabilities, revenue and expenses of all wholly-owned subsidiaries and majority-owned subsidiaries over which we exercise control and variable interest entities for which we have determined that we are the primary beneficiary. Outside stockholders' interests in subsidiaries are shown on the consolidated financial statements as Noncontrolling interests. Investments in entities in which we do not have a controlling financial interest are accounted for under the equity method, the fair value option, as available-for-sale securities or at cost adjusted for observable price changes and impairments, as appropriate.

Adoption of New Accounting Standards

We adopted the guidance in ASC Topic 606, Revenue from Contracts with Customers, on January 1, 2018. Topic 606 is a comprehensive new revenue recognition model that requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. See Note 13, Revenue Recognition, for information on the impact of adopting Topic 606 on our accounting policies.

We adopted the guidance in ASU 2016-01, Financial Instruments (Topic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities, as amended, on January 1, 2018. This ASU generally requires equity investments to be measured at fair value with changes in fair value recognized through net income and eliminates the cost method for equity securities. However, for equity investments without readily determinable fair values, the ASU permits entities to elect to measure the investments at cost adjusted for observable price changes and impairments, with changes in the measurement recognized through net income. We applied that measurement alternative to our equity investments that were previously accounted for under the cost method. The adoption of ASU 2016-01 did not have a material impact on the consolidated financial statements.

We adopted the guidance in ASU 2016-18, Statement of Cash Flows (Topic 230) - Restricted Cash, on January 1, 2018. This ASU requires companies to include amounts generally described as restricted cash and restricted cash equivalents, along with cash and cash equivalents, when reconciling the beginning-of-period and end-of-period amounts shown on the statement of cash flows. Previously, changes in restricted cash were reported within cash flows from operating activities. We applied that change in cash flow classification on a retrospective basis, which resulted in a $7.0 million decrease and a $1.3 million increase to net cash provided by operating activities for the years ended December 31, 2017 and 2016.

84

GROUPON, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets to amounts shown in the consolidated statements of cash flows, as of December 31, 2018, 2017 and 2016 (in thousands):

	December 31, 2018		December 31, 2017		December 31, 2016
Cash and cash equivalents	$	841,021	$	880,129	$	862,977
Restricted cash included in prepaid expenses and other current assets	3,320		4,932		5,769
Restricted cash included in other non-current assets	387		420		6,160
Cash, cash equivalents and restricted cash	$	844,728	$	885,481	$	874,906

We adopted the guidance in ASU 2017-05, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20) - Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets, on January 1, 2018. This ASU is meant to clarify the scope of ASC Subtopic 610-20, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets, and to add guidance for partial sales of nonfinancial assets. The adoption of ASU 2017-05 did not have a material impact on the consolidated financial statements.

We adopted the guidance in ASU 2017-07, Compensation - Retirement Benefits (Topic 715) - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, on January 1, 2018. This ASU requires employers to include only the service cost component of net periodic pension cost in operating expenses, together with other employee compensation costs. The other components of net periodic pension cost, including interest cost, expected return on plan assets, amortization of prior service cost and settlement and curtailment effects, are to be included in non-operating expenses. The adoption of ASU 2017-07 did not have a material impact on the consolidated financial statements.

We adopted the guidance in ASU 2017-09, Compensation - Stock Compensation (Topic 718) - Scope of Modification Accounting, on January 1, 2018. This ASU clarifies the changes to terms or conditions of a share-based payment award that require an entity to apply modification accounting. The adoption of ASU 2017-09 did not have a material impact on the consolidated financial statements.

We adopted the guidance in ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, as of January 1, 2018. This ASU permits a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (the "Jobs Act"). As a result of the adoption of ASU 2018-02, we reclassified $0.2 million from accumulated other comprehensive income to accumulated deficit.

We adopted the guidance in ASU 2017-01, Business Combinations (Topic 805) - Clarifying the Definition of a Business, on July 1, 2017. This ASU provides clarification on the definition of a business and provides guidance on whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The guidance in ASU 2017-01 was applied in determining that the sale of customer lists and other intangible assets in certain food delivery markets, as described in Note 6, Goodwill and Other Intangible Assets, did not meet the definition of a business. The adoption of ASU 2017-01 did not otherwise impact the accompanying consolidated financial statements.

We adopted the guidance in ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (Topic 740), on January 1, 2017. This ASU requires immediate recognition of the income tax consequences of intercompany asset transfers other than inventory. We recorded a $3.2 million cumulative effect adjustment to increase our accumulated deficit as of January 1, 2017 to recognize the impact of that change in accounting policy.

We adopted the guidance in ASU 2015-11, Inventory (Topic 330) - Simplifying the Measurement of Inventory, on January 1, 2017. This ASU requires inventory to be measured at the lower of cost or net realizable value, rather than the lower of cost or market. The adoption of ASU 2015-11 did not have a material impact on the accompanying consolidated financial statements.

85

GROUPON, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

We adopted the guidance in ASU 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40) - Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern, as of December 31, 2016. This ASU requires management to assess a company's ability to continue as a going concern and to provide related disclosures in certain circumstances. Based on the results of our analysis, no additional disclosures were required.

We adopted the guidance in ASU 2016-09, Compensation - Stock Compensation (Topic 718) - Improvements to Employee Share-Based Payment Accounting, on January 1, 2016. Under this ASU, entities are permitted to make an accounting policy election to either estimate forfeitures on share-based payment awards, as previously required, or to recognize forfeitures as they occur. We elected to recognize forfeitures as they occur and the impact of that change in accounting policy was recorded as a $3.1 million cumulative effect adjustment to increase accumulated deficit as of January 1, 2016. Additionally, ASU 2016-09 requires that all income tax effects related to settlements of share-based payment awards be reported in earnings as an increase or decrease to provision (benefit) for income taxes. Previously, income tax benefits at settlement of an award were reported as an increase (or decrease) to additional paid-in capital to the extent that those benefits were greater than (or less than) the income tax benefits reported in earnings during the award's vesting period. The requirement to report those income tax effects in earnings was applied on a prospective basis to settlements occurring on or after January 1, 2016. ASU 2016-09 also requires that all income tax-related cash flows resulting from share-based payment awards be reported as operating activities in the consolidated statement of cash flows. Previously, income tax benefits at settlement of an award were reported as a reduction to operating cash flows and an increase to financing cash flows to the extent that those benefits exceeded the income tax benefits reported in earnings during the award's vesting period. The Company elected to apply that change in cash flow classification on a retrospective basis, which resulted in an increase of $7.6 million to net cash provided by operating activities and a corresponding increase to net cash used in financing activities for the year ended December 31, 2015. The remaining provisions of ASU 2016-09 did not have a material impact on the accompanying consolidated financial statements.

We adopted the guidance in ASU 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis, on January 1, 2016. This ASU expands the variable interest entity ("VIE") criteria to specifically include limited partnerships in certain circumstances. The adoption of ASU 2015-02 did not have a material impact on the accompanying consolidated financial statements. We determined that Monster Holdings LP ("Monster LP") is not a VIE under ASU 2015-02, which is consistent with its conclusion prior to adoption of the ASU. That investment is evaluated as a corporation, rather than a limited partnership, for purposes of making consolidation determinations because its governance structure is akin to a corporation. Under the terms of Monster LP’s amended and restated agreement of limited partnership, all of the objectives and purposes of Monster LP are carried out by a board of directors, rather than a general partner.

Reclassifications and Terminology Changes

Certain reclassifications have been made to the consolidated financial statements of prior periods and the accompanying notes to conform to the current period presentation, including the change in presentation of restricted cash in the consolidated statements of cash flows upon adoption of ASU 2016-18 as described above. Additionally, in prior years, we referred to our product revenue and service revenue as "direct revenue" and "third-party and other revenue," respectively. This terminology change did not impact the amounts presented in the consolidated financial statements.

Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires estimates and assumptions that affect the reported amounts and classifications of assets and liabilities, revenue and expenses, and the related disclosures of contingent liabilities in the consolidated financial statements and accompanying notes. Estimates are used for, but not limited to, variable consideration from unredeemed vouchers, income taxes, initial valuation and subsequent impairment testing of goodwill and intangible assets, investments, customer refunds, contingent liabilities and the useful lives of property, equipment and software and intangible assets. Actual results could differ materially from those estimates.

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Cash, Cash Equivalents and Restricted Cash

We consider all highly liquid investments with an original maturity of three months or less from the date of purchase to be cash equivalents. Restricted cash represents amounts that we are unable to access for operational purposes. These amounts primarily relate to withholdings from employee paychecks under our employee stock purchase plan ("ESPP").

Accounts Receivable, Net

Accounts receivable primarily represents the net cash due from credit card and other payment processors and from merchants and performance marketing networks for commissions earned on consumer purchases. The carrying amount of receivables is reduced by an allowance for doubtful accounts that reflects management's best estimate of amounts that will not be collected. The allowance is based on historical loss experience and any specific risks identified in collection matters. Accounts receivable are charged off against the allowance for doubtful accounts when it is determined that the receivable is uncollectible.

Inventories

 Inventories, consisting of merchandise purchased for resale, are accounted for using the first-in, first-out method of accounting and are valued at the lower of cost or net realizable value. We write down our inventory to the lower of cost or net realizable value based upon assumptions about future demand and market conditions. If actual market conditions are less favorable than those projected, additional inventory write-downs may be required. Once established, the original cost of the inventory less the related inventory write-down represents a new cost basis.

Property and Equipment

Property and equipment are stated at cost and assets under capital leases are stated at the lesser of the present value of minimum lease payments or their fair market value. Depreciation and amortization of property and equipment is recorded on a straight-line basis over the estimated useful lives of the assets. Generally, the useful lives are three to five years for computer hardware and office equipment, five to ten years for furniture and fixtures and warehouse equipment and the shorter of the term of the lease or the asset’s useful life for leasehold improvements and assets under capital leases.

Internal-Use Software

We incur costs related to internal-use software and website development, including purchased software and internally-developed software. Costs incurred in the planning and evaluation stage of internally-developed software and website development are expensed as incurred. Costs incurred and accumulated during the application development stage are capitalized and included within Property, equipment and software, net on the consolidated balance sheets. Amortization of internal-use software is recorded on a straight-line basis over the two-year estimated useful life of the assets.

Impairment of Long-Lived Assets

Long-lived assets, such as property, equipment and software and intangible assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. If circumstances require that a long-lived asset or asset group to be held and used be tested for possible impairment, we first compare the undiscounted cash flows expected to be generated by that long-lived asset or asset group to its carrying amount. If the carrying amount of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment is recognized to the extent that the carrying amount exceeds its fair value.

Long-lived assets or disposal groups classified as held for sale are recorded at the lower of their carrying amount or fair value less estimated selling costs. Long-lived assets are not depreciated or amortized while classified as held for sale.

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Goodwill

Goodwill is allocated to our reporting units at the date the goodwill is initially recorded. Once goodwill has been allocated to the reporting units, it no longer retains its identification with a particular acquisition and becomes identified with the reporting unit in its entirety. Accordingly, the fair value of the reporting unit as a whole is available to support the recoverability of its goodwill.

We evaluate goodwill for impairment annually on October 1 or more frequently when an event occurs or circumstances change that indicates the carrying value may not be recoverable. We have the option to assess goodwill for impairment by first performing a qualitative assessment to determine whether it is more-likely-than-not that the fair value of a reporting unit is less than its carrying amount. If we determine that it is not more-likely-than-not that the fair value of a reporting unit is less than its carrying amount, then the two-step goodwill impairment test is not required to be performed. If we determine that it is more-likely-than-not that the fair value of a reporting unit is less than its carrying amount, or if we do not elect the option to perform an initial qualitative assessment, we perform the two-step goodwill impairment test. In the first step, the fair value of the reporting unit is compared with its book value including goodwill. If the fair value of the reporting unit is in excess of its book value, the related goodwill is not impaired and no further analysis is necessary. If the fair value of the reporting unit is less than its book value, there is an indication of potential impairment and a second step is performed. When required, the second step of testing involves calculating the implied fair value of goodwill for the reporting unit. The implied fair value of goodwill is determined in the same manner as goodwill recognized in a business combination, which is the excess of the fair value of the reporting unit determined in step one over the fair value of its net assets, including identifiable intangible assets, as if the reporting unit had been acquired. If the carrying value of the reporting unit's goodwill exceeds the implied fair value of that goodwill, an impairment loss is recognized in an amount equal to that excess. For reporting units with a negative book value (i.e., excess of liabilities over assets), we evaluate qualitative factors to determine whether it is necessary to perform the second step of the goodwill impairment test.

Investments

Investments in equity shares without a readily determinable fair value and for which we do not have the ability to exercise significant influence are accounted for at cost adjusted for observable price changes and impairments, with changes in the measurement recognized through net income. Those investments are classified within Investments on the consolidated balance sheets.

Investments in common stock or in-substance common stock for which we have the ability to exercise significant influence are accounted for under the equity method, except where we have made an irrevocable election to account for the investments at fair value. Those investments are classified within Investments on the consolidated balance sheets. The proportionate share of income or loss on equity method investments and changes in the fair values of investments for which the fair value option has been elected are presented within Other income (expense), net on the consolidated statements of operations.

Investments in convertible debt securities and convertible redeemable preferred shares are accounted for as available-for-sale securities, which are classified within Investments on the consolidated balance sheets. Available-for-sale securities are recorded at fair value each reporting period. Unrealized gains and losses, net of the related tax effects, are excluded from earnings and recorded as a separate component within Accumulated other comprehensive income on the consolidated balance sheets until realized. Interest income from available-for-sale securities is reported within Other income (expense), net on the consolidated statements of operations.

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Other-than-Temporary Impairment of Investments

An unrealized loss exists when the current fair value of an investment is less than its cost basis. We conduct reviews of our investments with unrealized losses on a quarterly basis to evaluate whether those impairments are other-than-temporary. This evaluation, which is performed at the individual investment level, considers qualitative and quantitative factors regarding the severity and duration of the unrealized loss, as well as our intent and ability to hold the investment for a period of time that is sufficient to allow for an anticipated recovery in value. Evidence considered in this evaluation includes the amount of the impairment, the length of time that the investment has been impaired, the factors contributing to the impairment, the financial condition and near-term prospects of the investee, recent operating trends and forecasted performance of the investee, market conditions in the geographic area or industry in which the investee operates and our strategic plans for holding the investment in relation to the period of time expected for an anticipated recovery in value. Additionally, we consider whether we intend to sell the investment or whether it is more likely than not that it will be required to sell the investment before recovery of its amortized cost basis. Investments with unrealized losses that are determined to be other-than-temporary are written down to fair value with a charge to earnings. Unrealized losses that are determined to be temporary in nature are not recorded for equity method investments, while such losses are recorded, net of tax, in accumulated other comprehensive income for available-for-sale securities.

Income Taxes

We account for income taxes using the asset and liability method, under which deferred income tax assets and liabilities are recognized based upon anticipated future tax consequences attributable to differences between the financial statement carrying amounts of assets and liabilities and their respective tax bases. We regularly review deferred tax assets to assess whether it is more likely than not that the deferred tax assets will be realized and, if necessary, establish a valuation allowance for portions of such assets to reduce the carrying value.

For purposes of assessing whether it is more likely than not that deferred tax assets will be realized, we consider the following four sources of taxable income for each tax jurisdiction: (a) future reversals of existing taxable temporary differences, (b) projected future earnings, (c) taxable income in carryback years, to the extent that carrybacks are permitted under the tax laws of the applicable jurisdiction, and (d) tax planning strategies, which represent prudent and feasible actions that a company ordinarily might not take, but would take to prevent an operating loss or tax credit carryforward from expiring unused. To the extent that evidence about one or more of these sources of taxable income is sufficient to support a conclusion that a valuation allowance is not necessary, other sources need not be considered. Otherwise, evidence about each of the sources of taxable income is considered in arriving at a conclusion about the need for and amount of a valuation allowance. See Note 15, Income Taxes, for further information about our valuation allowance assessments.

We are subject to taxation in the United States, various states and foreign jurisdictions. Significant judgment is required in determining the worldwide provision for income taxes and recording the related income tax assets and liabilities. During the ordinary course of business, there are many transactions and calculations for which the ultimate tax determination is uncertain. For example, our effective tax rate could be adversely affected by earnings being lower than anticipated in countries where it has lower statutory rates and higher than anticipated in countries where it has higher statutory rates, by changes in foreign currency exchange rates, by changes in the valuation of deferred tax assets and liabilities, by changes in the measurement of uncertain tax positions or by changes in the relevant laws, regulations, principles and interpretations. We account for uncertainty in income taxes by recognizing the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit. For tax positions meeting the more-likely-than-not criteria, the amount recognized in the consolidated financial statements is the largest benefit that has a greater than 50 percent likelihood of being realized upon ultimate settlement with the relevant tax authority.

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Lease and Asset Retirement Obligations

We classify leases at their inception as either operating or capital leases and may receive renewal or expansion options, rent holidays and leasehold improvement or other incentives on certain lease agreements. We recognize operating lease costs on a straight-line basis, taking into account adjustments for escalating payments and lease incentives. Rent expense associated with operating lease obligations is primarily classified within Selling, general and administrative on the consolidated statements of operations. Minimum lease payments made under capital leases are apportioned between interest expense, which is presented within Other income (expense), net on the consolidated statements of operations, and a reduction of the related capital lease obligations, which are classified within Accrued expenses and other current liabilities and Other non-current liabilities on the consolidated balance sheets.

We establish assets and liabilities for the present value of estimated future costs to retire long-lived assets at the termination or expiration of a lease. Such assets are amortized over the lease term, and the recorded liabilities are accreted to the future value of the estimated retirement costs. The related amortization and accretion expenses are presented within Selling, general and administrative on the consolidated statements of operations.

Revenue Recognition

On January 1, 2018, we adopted Topic 606 using the modified retrospective method. Beginning on January 1, 2018, results are presented in accordance with the revised policies, while prior period amounts are not adjusted and continue to be reported in accordance with our historical policies. See Note 13, Revenue Recognition, for additional information.

We recognize revenue when we satisfy a performance obligation by transferring a promised good or service to a customer. Substantially all of our performance obligations are satisfied at a point in time rather than over time.

Service revenue

Service revenue is primarily earned from transactions in which we earn commissions by selling goods or services on behalf of third-party merchants. Those transactions generally involve a customer's purchase of a voucher through one of our online marketplaces that can be redeemed with a third-party merchant for specified goods or services (or for discounts on specified goods or services). Service revenue from those transactions is reported on a net basis as the purchase price collected from the customer less the portion of the purchase price that is payable to the third-party merchant. We recognize revenue from those transactions when our commission has been earned, which occurs when a sale through one of our online marketplaces is completed and the related voucher has been made available to the customer. We believe that our remaining obligations to remit payment to the merchant and to provide information about vouchers sold are administrative activities that are immaterial in the context of the contract with the merchant. Revenue from hotel reservation offerings is recognized at the time the reservation is made, net of an allowance for estimated cancellations.

We also earn commissions when customers make purchases with retailers using digital coupons accessed through our websites and mobile applications and from voucherless merchant offerings in which customers earn cash back on their credit card statements when they transact with third-party merchants. We recognize those commissions as revenue in the period in which the underlying transactions between the customer and the third-party merchant are completed. Additionally, we earn advertising revenue when the advertiser's logo or website link has been included on our websites or in specified email distributions for the requisite period of time as set forth in the agreement with the advertiser.

Product revenue

We generate product revenue from direct sales of merchandise inventory through our Goods category. For product revenue transactions, we are the primary party responsible for providing the good to the customer, we have inventory risk and we have discretion in establishing prices. As such, product revenue is reported on a gross basis as the purchase price received from the customer. Product revenue, including associated shipping revenue, is recognized when title passes to the customer upon delivery of the product.

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Variable Consideration for Unredeemed Vouchers

For merchant agreements with redemption payment terms, the merchant is not paid its share of the sale price for a voucher sold through one of our online marketplaces until the customer redeems the related voucher. If the customer does not redeem a voucher with such merchant payment terms, we retain all of the gross billings for that voucher, rather than retaining only our net commission. We estimate the variable consideration from vouchers that will not ultimately be redeemed using our historical voucher redemption experience and recognize that amount as revenue at the time of sale. We only recognize amounts in variable consideration when we believe it is probable that a significant reversal of revenue will not occur in future periods, which requires us to make significant estimates of future redemptions. If actual redemptions differ from our estimates, the effects could be material to the consolidated financial statements. As of December 31, 2018, we constrained $13.7 million in revenue from unredeemed vouchers that we may recognize in future periods when we determine it is probable that a significant amount of that revenue will not be subsequently reversed.

Refunds

Refunds are recorded as a reduction of revenue. The liability for estimated refunds is included within Accrued expenses and other current liabilities on the consolidated balance sheets.

We estimate our refund reserve using historical refund experience by deal category. We assess the trends that could affect our estimates on an ongoing basis and make adjustments to the refund reserve calculations if it appears that changes in circumstances, including changes to our refund policies or general economic conditions, may cause future refunds to differ from our initial estimates. If actual refunds differ from our estimates, the effects could be material to the consolidated financial statements.

Discounts, Customer Credits and Other Consideration Payable to Customers

We provide discount offers to encourage purchases of goods and services through our online marketplaces. We record discounts as a reduction of revenue.

Additionally, we issue credits to customers that can be applied to future purchases through our online marketplaces. Credits are primarily issued as consideration for refunds. To a lesser extent, credits are issued for customer relationship purposes. Credits issued to satisfy refund requests are applied as a reduction to the refunds reserve and customer credits issued for relationship purposes are classified as a reduction of revenue. Breakage income from customer credits that are not expected to be used is estimated and recognized as revenue in proportion to the pattern of redemption for customer credits that are used.

Sales and related taxes

Sales, use, value-added and related taxes that are imposed on specific revenue-generating transactions are presented on a net basis and excluded from revenue.

Costs of Obtaining Contracts

Incremental costs to obtain contracts with third-party merchants, such as sales commissions, are deferred and recognized over the expected period of the merchant arrangement, generally from 12 to 18 months. Those costs are classified within Selling, general and administrative expenses in the consolidated statements of operations.

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Cost of Revenue

Cost of revenue is comprised of direct and certain indirect costs incurred to generate revenue. Costs incurred to generate revenue, which include credit card processing fees, editorial costs, compensation expense for technology support personnel who are responsible for maintaining the infrastructure of our websites, amortization of internal-use software relating to customer-facing applications, web hosting and other processing fees are attributed to the cost of service and product revenue in proportion to gross billings during the period. For product revenue transactions, cost of revenue also includes the cost of inventory, shipping and fulfillment costs and inventory markdowns. Fulfillment costs are comprised of third-party logistics provider costs, as well as rent, depreciation, personnel costs and other costs of operating our fulfillment center.

Stock-Based Compensation

We measure stock-based compensation cost at fair value. Expense is generally recognized on a straight-line basis over the service period during which awards are expected to vest, except for awards with both performance conditions and a graded vesting schedule, which are recognized using the accelerated method. We present stock-based compensation expense within the consolidated statements of operations based on the classification of the respective employees' cash compensation. See Note 12, Compensation Arrangements.

Foreign Currency

Balance sheet accounts of our operations outside of the United States are translated from foreign currencies into U.S. dollars at exchange rates as of the consolidated balance sheet dates. Revenue and expenses are translated at average exchange rates during the period. Foreign currency translation adjustments and foreign currency gains and losses on intercompany balances that are of a long-term investment nature are included within Accumulated other comprehensive income on the consolidated balance sheets. Foreign currency gains and losses resulting from transactions that are denominated in currencies other than the entity's functional currency, including foreign currency gains and losses on intercompany balances that are not of a long-term investment nature, are included within Other income (expense), net on the consolidated statements of operations.

Business Combinations

The results of businesses acquired are included in the consolidated financial statements beginning on the respective acquisition dates. The fair value of consideration transferred in business combinations is allocated to the tangible and intangible assets acquired and liabilities assumed at the acquisition date, with the remaining unallocated amount recorded as goodwill. Acquired goodwill represents the premium paid over the fair value of the net tangible and intangible assets acquired. We may pay a premium for a number of reasons, including growing our merchant base and acquiring an assembled workforce. The goodwill from business combinations is generally not deductible for tax purposes.

Recently Issued Accounting Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). This ASU will require the recognition of lease assets and liabilities for operating leases with terms of more than 12 months, in addition to the capital lease assets and liabilities currently recorded on our consolidated balance sheets. Presentation of leases within the consolidated statements of operations and cash flows will be substantially consistent with current accounting guidance. The ASU, which is effective for annual reporting periods beginning after December 15, 2018, and interim periods within those annual periods, will have a material impact on our consolidated balance sheets. We have completed the implementation of a lease accounting system. We plan to adopt the ASU effective January 1, 2019 using the modified retrospective transition method and will not restate comparative periods. The modified retrospective transition method requires the cumulative effect, if any, of initially applying the guidance to be recognized as an adjustment to our accumulated deficit as of that adoption date. We plan to elect the package of practical expedients permitted under the transition guidance within the ASU, which allows us to carry forward prior conclusions about lease identification, classification and initial direct costs for leases entered into prior to adoption of Topic 842. Additionally, we plan to not separate lease and non-lease components for all of our leases. For leases with a term of 12 months or less, we plan to elect the short-term lease exemption, which allows us to not recognize right-of-use assets or lease liabilities for

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qualifying leases existing at transition and new leases we may enter into in the future. While we continue to assess all impacts of adoption, we currently expect to recognize additional lease liabilities of $100.0 million to $115.0 million representing the present value of the remaining minimum lease payments at January 1, 2019 and corresponding right-of-use assets of the same amount. See Note 10, Commitments and Contingencies, for information about our lease commitments.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses of Financial Instruments. This ASU requires entities to measure credit losses for financial assets measured at amortized cost based on expected losses rather than incurred losses. For available-for-sale debt securities with unrealized losses, entities will be required to recognize credit losses through an allowance for credit losses. The ASU will be effective for annual reporting periods beginning after December 15, 2019 and interim periods within those annual periods. While we are still assessing the impact of ASU 2016-13, we currently believe that the adoption of this guidance will not have a material impact on our consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350) - Simplifying the Test for Goodwill Impairment. This ASU eliminates Step 2 of the goodwill impairment test and requires a goodwill impairment to be measured as the amount by which a reporting unit’s carrying amount exceeds its fair value, not to exceed the carrying amount of its goodwill. The ASU is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019 and early adoption is permitted. We believe that the adoption of this guidance will not have a material impact on our consolidated financial statements.

In June 2018, the FASB issued ASU 2018-07, Compensation - Stock Compensation (Topic 718) - Improvements to Nonemployee Share-Based Payment Accounting. This ASU expands the scope of Topic 718 to make the guidance to share-based payment awards to nonemployees consistent with the guidance for share-based payment awards to employees. The ASU will be effective for annual reporting periods beginning after December 15, 2018 and interim periods within those annual periods. We believe that the adoption of this guidance will not have a material impact on our consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820) - Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This ASU modifies the disclosure requirements in Topic 820, Fair Value Measurement, by removing, modifying, or adding certain disclosures. The ASU will be effective for annual reporting periods beginning after December 15, 2019 and interim periods within those annual periods. Early adoption is permitted, and entities are permitted to early adopt any removed or modified disclosures and delay adoption of the additional disclosures until the effective date. We are still assessing the impact of ASU 2018-13 on our consolidated financial statements.

In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This ASU requires entities in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40, Internal-Use Software, to determine which costs to implement the service contract would be capitalized as an asset related to the service contract and which costs would be expensed. The ASU will be effective for annual reporting periods beginning after December 15, 2019 and interim periods within those annual periods. Early adoption is permitted, including in interim periods. We currently plan to early adopt the guidance on January 1, 2019 and will prospectively apply that guidance to all implementation costs incurred after that adoption date. We may incur substantial costs within the scope of this guidance.

There are no other accounting standards that have been issued but not yet adopted that we believe could have a material impact on our consolidated financial statements.

3. DISCONTINUED OPERATIONS AND OTHER BUSINESS DISPOSITIONS

Discontinued Operations

In October 2016, we completed a strategic review of our international markets in connection with our efforts to optimize our global footprint and focus on the markets that we believe have the greatest potential to benefit our long-term financial performance. Based on that review, we decided to focus our business on 15 core countries and to pursue

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strategic alternatives for our operations in the remaining 11 countries, which were primarily based in Asia and Latin America. The dispositions of our operations in those 11 countries were completed between November 2016 and March 2017.

A business disposition that represents a strategic shift and has (or will have) a major effect on our operations and financial results is reported as a discontinued operation. We determined that the decision reached by management and our Board of Directors to exit those 11 non-core countries, which comprised a substantial majority of the operations outside of North America and EMEA, represented a strategic shift in our business. Additionally, based on our review of quantitative and qualitative factors relevant to the dispositions, we determined that the disposition of the businesses in those countries would have a major effect on our operations and financial results. As such, the results of operations and cash flows for the operations in those countries, including the gains and losses on the dispositions and related income tax effects, are presented as discontinued operations in the accompanying consolidated financial statements for the years ended December 31, 2017 and 2016.

In connection with our strategic initiative to exit non-core countries as discussed above, we sold an 83% controlling stake in our subsidiary in Israel and sold our subsidiaries in Argentina, Chile, Colombia, Peru, Mexico, Brazil, Singapore and Hong Kong during the first quarter 2017. Additionally, we sold our subsidiary in Malaysia and ceased our operations in South Africa during the fourth quarter 2016. For the years ended December 31, 2017 and 2016, we recognized a net pretax loss of $1.6 million and a net pretax gain of $0.3 million, respectively, on those dispositions, which consisted of the following (in thousands):

	Year Ended December 31,
	2017			2016
Net consideration received:
Fair value of minority investments retained or acquired	$	2,021		$	2,457
Cash proceeds received	3,462			—
Cash proceeds receivable	2,000			—
Less: transaction costs	1,394			190
Total net consideration received	6,089			2,267
Cumulative translation gain (loss) reclassified to earnings	14,718			(1,201		)
Less: Net book value upon closing of the transactions	14,958			754
Less: Indemnification liabilities (1)	5,365			—
Less: Unfavorable contract liability for transition services	2,114			—
Gain (loss) on dispositions	$	(1,630	)	$	312

(1) See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

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The following table summarizes the major classes of line items included in loss from discontinued operations, net of tax, for the years ended December 31, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2017 (1) (2)			2016 (1)
Service revenue	$	12,602		$	97,105
Product revenue	2,962			32,634
Service cost of revenue	(2,557		)	(21,697		)
Product cost of revenue	(3,098		)	(31,792		)
Marketing expense	(1,239		)	(10,776		)
Selling, general and administrative expense	(12,007		)	(72,141		)
Restructuring	(778		)	(3,170		)
Other income (expense), net	3,852			(4,818		)
Loss from discontinued operations before gain (loss) on dispositions and provision for income taxes	(263		)	(14,655		)
Gain (loss) on dispositions	(1,630		)	312
Provision for income taxes	(81		)	(2,771		)
Loss from discontinued operations, net of tax	$	(1,974	)	$	(17,114	)

(1) The loss from discontinued operations before gain (loss) on dispositions and provision for income taxes for the years ended December 31, 2017 and 2016 includes the results of each business through its respective disposition date.

(2) Selling, general and administrative expense from discontinued operations for the year ended December 31, 2017 includes increases to contingent liabilities under indemnification agreements. See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

Other Dispositions

During the year ended December 31, 2016, we sold our subsidiaries in Russia and Indonesia, and our point of sale business, Breadcrumb. The consideration received in exchange for Indonesia and Breadcrumb included minority investments in their respective acquirers. We recognized a pretax gain of $11.4 million in connection with those transactions, which is presented within Gains on business dispositions in the accompanying consolidated statements of operations, and consisted of the following (in thousands):

	Year Ended December 31, 2016
Net consideration received:
Fair value of minority investments acquired	$	11,029
Less: transaction costs	849
Total net consideration received	10,180
Cumulative translation gain reclassified to earnings	7,468
Less: Net book value upon closing of the transactions	6,249
Gain on business dispositions	$	11,399

The financial results of the disposed entities are presented within income from continuing operations in the accompanying consolidated financial statements through their respective disposition dates. Those financial results were not material for the year ended December 31, 2016.

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4. BUSINESS COMBINATIONS

We acquired one business during the year ended December 31, 2018 and three businesses during the year ended December 31, 2016. For the years ended December 31, 2018 and 2016, $0.7 million and $1.6 million, of external transaction costs related to business combinations, primarily consisting of legal and advisory fees, are classified within Selling, general and administrative on the consolidated statements of operations. The results of businesses acquired are included in the consolidated financial statements beginning on the respective acquisition dates. Acquired goodwill represents the premium paid over the fair value of the net tangible and intangible assets acquired. We may pay a premium for a number of reasons, including growing our merchant base and acquiring an assembled workforce.

2018 Acquisition Activity

On April 30, 2018, we acquired 80% of the outstanding shares of Cloud Savings Company, Ltd. ("Cloud Savings"), a UK-based business that operates online discount code and digital gift card platforms. The primary purpose of this acquisition was to expand digital coupon offerings in our International segment. The transaction included a contingent consideration arrangement with an acquisition-date fair value of $1.6 million. In additional, concurrent with the acquisition, we entered into an agreement with the noncontrolling shareholder that gave us the right to acquire and the noncontrolling shareholder's right to put to us the remaining outstanding shares of Cloud Savings in December 2018. The acquisition-date fair value of the right and obligation to acquire the remaining outstanding shares of $8.6 million was initially recorded as a financing obligation and classified within Accrued expenses and other current liabilities on the consolidated balance sheets. We paid $8.4 million to exercise that right in December 2018. The aggregate acquisition-date fair value of the consideration transferred for the Cloud Savings acquisition totaled $74.6 million, which consisted of the following (in thousands):

Cash	$	64,363
Financing obligation	8,604
Contingent consideration	1,589
Total	$	74,556

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The following table summarizes the allocation of the aggregate acquisition price of the Cloud Savings acquisition (in thousands). The allocation of the acquisition price has been prepared on a preliminary basis, and changes to that allocation may occur as a result of final working capital adjustments and tax return filings.

Cash and cash equivalents	$	6,244
Accounts receivable	5,885
Prepaid expenses and other current assets	804
Property, equipment and software	226
Goodwill	46,515
Intangible assets (1) :
Merchant relationships	20,322
Trade names	2,609
Developed technology	549
Other intangible assets	687
Total assets acquired	$	83,841
Accounts payable	$	693
Accrued merchant and supplier payables	386
Accrued expenses and other current liabilities	6,130
Other non-current liabilities	2,076
Total liabilities assumed	$	9,285
Total acquisition price	$	74,556

(1) The estimated useful lives of the acquired intangible assets are 6 years for merchant relationships, 8 years for trade names, 2 years for developed technology, and 1 year for other intangible assets.

The results of the Cloud Savings acquisition are included in our consolidated financial statements from the date of acquisition through December 31, 2018. The revenue and net income of Cloud Savings included in our consolidated statements of operations were $12.9 million and $1.1 million, for the period from April 30, 2018 through December 31, 2018. Pro forma results of operations for the Cloud Savings acquisition are not presented because the pro forma effects of that acquisition were not material to our consolidated results of operations.

2016 Acquisition Activity

LivingSocial, Inc.

On October 31, 2016, we acquired all of the outstanding equity interests of LivingSocial, Inc. ("LivingSocial"), an e-commerce company that connects merchants to consumers by offering goods and services, generally at a discount. The primary purpose of this acquisition was to grow our customer base. We acquired LivingSocial for no consideration.

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The following table summarizes the assets acquired and liabilities assumed from the LivingSocial acquisition (in thousands):

Cash and cash equivalents	$	15,479
Accounts receivable	3,652
Prepaid expenses and other current assets	2,399
Property, equipment and software	1,075
Goodwill	528
Intangible assets: (1)
Customer relationships	16,200
Merchant relationships	2,700
Trade name	1,000
Developed technology	2,500
Other non-current assets	5,495
Total assets acquired	$	51,028
Accounts payable	$	2,184
Accrued merchant and supplier payables	18,498
Accrued expenses and other current liabilities	25,854
Other non-current liabilities	4,492
Total liabilities assumed	$	51,028
Total acquisition price	$	—

(1) The estimated useful lives of the acquired intangible assets are 1 year for developed technology, 4 years for trade name and 3 years for merchant relationships and customer relationships.

The following pro forma information presents the combined operating results for the year ended December 31, 2016 as if we had acquired LivingSocial as of January 1, 2016 (in thousands). The underlying pro forma results include the historical financial results of us and this acquired business adjusted for depreciation and amortization expense associated with the assets acquired. The pro forma results do not reflect any operating efficiencies or potential cost savings which may result from the consolidation of the operations of us and the acquired entity. Accordingly, these pro forma results are not necessarily indicative of what the actual combined results of operations would have been if the acquisition had occurred as of January 1, 2016, nor are they indicative of future results of operations.

	Year Ended December 31, 2016
Revenue	$	3,070,431
Loss from continuing operations	(182,781		)

The revenue and net loss of LivingSocial included in our consolidated statements of operations were $9.3 million and $4.3 million, for the period from October 31, 2016 through December 31, 2016.

Other Acquisitions

We acquired two other businesses during the year ended December 31, 2016. The acquisition price of those businesses and the assets acquired and liabilities assumed were not material.

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5. PROPERTY, EQUIPMENT AND SOFTWARE, NET

The following summarizes property, equipment and software, net as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018			2017
Warehouse equipment	$	5,265		$	4,989
Furniture and fixtures	9,677			11,700
Leasehold improvements	50,314			49,605
Office equipment	2,261			2,690
Purchased software	8,523			32,090
Computer hardware (1)	174,700			208,659
Internally-developed software (2)	196,807			249,207
Total property, equipment and software, gross	447,547			558,940
Less: accumulated depreciation and amortization	(304,430		)	(407,795		)
Property, equipment and software, net	$	143,117		$	151,145

(1) Includes computer hardware acquired under capital leases of $120.5 million and $132.3 million as of December 31, 2018 and 2017.

(2) The net carrying amount of internally-developed software was $70.9 million and $64.5 million as of December 31, 2018 and 2017.

As of December 31, 2018, we removed $75.9 million of certain fully depreciated property and equipment and $105.0 million of certain fully amortized internally-developed software from gross property, equipment and software and accumulated depreciation and amortization.

Depreciation and amortization expense on property, equipment and software is classified as follows in the accompanying consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
Service cost of revenue	$	28,102	$	26,738	$	21,277
Product cost of revenue	8,467		9,900		10,616
Selling, general and administrative	64,761		78,157		85,068
Total	$	101,330	$	114,795	$	116,961

The above amounts include amortization of internally-developed software of $53.9 million, $57.0 million and $55.0 million, and amortization expense on assets under capital leases of $30.2 million, $35.2 million and $29.8 million, for the years ended December 31, 2018, 2017 and 2016.

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6. GOODWILL AND OTHER INTANGIBLE ASSETS

The following table summarizes goodwill activity by segment for the years ended December 31, 2018 and 2017 (in thousands):

	North America		EMEA			Rest of World			International			Consolidated
Balance as of December 31, 2016	$	178,685	$	89,747		$	6,119		$	—		$	274,551
Reallocation to new segment (1)	—		(89,747		)	(6,119		)	95,866			—
Foreign currency translation	—		—			—			12,438			12,438
Balance as of December 31, 2017	$	178,685	$	—		$	—		$	108,304		$	286,989
Goodwill related to acquisition	—		—			—			46,515			46,515
Foreign currency translation	—		—			—			(8,013		)	(8,013		)
Balance as of December 31, 2018	$	178,685	$	—		$	—		$	146,806		$	325,491

(1) We updated our segments in the first quarter of 2017 to report two operating segments: North America and International. Refer to Note 19, Segment Information, for additional information on our change in reporting segments.

We evaluate goodwill for impairment annually on October 1 or more frequently when an event occurs or circumstances change that indicates the carrying value may not be recoverable. There was no goodwill impairment for the years ended December 31, 2018, 2017 and 2016.

The following table summarizes intangible assets as of December 31, 2018 and 2017 (in thousands):

	December 31, 2018						December 31, 2017
	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Customer relationships	$	16,200	$	11,700	$	4,500	$	56,749	$	46,513	$	10,236
Merchant relationships	21,554		4,105		17,449		11,598		9,853		1,745
Trade names	9,476		6,799		2,677		12,077		10,469		1,608
Developed technology	13,825		13,485		340		36,864		36,864		—
Patents	20,508		16,451		4,057		19,031		15,204		3,827
Other intangible assets	26,007		9,629		16,378		10,875		9,095		1,780
Total	$	107,570	$	62,169	$	45,401	$	147,194	$	127,998	$	19,196

As of December 31, 2018, we removed $77.4 million of certain fully amortized intangible assets from gross intangible assets and accumulated amortization.

Amortization of intangible assets is computed using the straight-line method over their estimated useful lives, which range from 1 to 10 years. Amortization expense from continuing operations related to intangible assets was $14.5 million, $23.0 million and $18.9 million for the years ended December 31, 2018, 2017 and 2016. As of December 31, 2018, our estimated future amortization expense related to intangible assets is as follows (in thousands):

2019	$	13,807
2020	7,535
2021	6,811
2022	6,495
2023	5,346
Thereafter	5,407
Total	$	45,401

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Sale of Intangible Assets

On September 15, 2017, we sold customer lists and other intangible assets in certain food delivery markets to a subsidiary of Grubhub Inc. ("Grubhub"). We recognized a pretax gain on the sale of assets of $17.1 million, which represents the excess of the $19.8 million in net proceeds received, consisting of $20.0 million in cash less $0.2 million in transaction costs, over the $2.7 million net book value of the assets upon closing of the transaction. See Note 14, Restructuring, for additional information.

7. INVESTMENTS

The following table summarizes investments as of December 31, 2018 and 2017 (dollars in thousands):

	December 31, 2018		Percent Ownership of Voting Stock			December 31, 2017		Percent Ownership of Voting Stock
Available-for-sale securities:
Convertible debt securities	$	—				$	11,354
Redeemable preferred shares	10,340		19%	to	25%	15,431		19%	to	25%
Total available-for-sale securities	10,340					26,785
Fair value option investments	73,902		10%	to	19%	82,966		10%	to	19%
Other equity investments (1)	24,273		1%	to	19%	25,438		1%	to	19%
Total investments	$	108,515				$	135,189

(1) Represents equity investments without readily determinable fair values. Those investments were previously accounted for using the cost method of accounting. Under the cost method, investments were carried at cost and adjusted only for other-than-temporary declines in fair value, certain distributions and additional investments. We adopted the guidance in ASU 2016-01 on January 1, 2018. Under that guidance, we have elected to record equity investments without readily determinable fair values at cost adjusted for observable price changes and impairments. There were no adjustments for observable price changes related to these investments for the year ended December 31, 2018. See further discussion under Other Equity Investments below.

Available-for-sale securities

The following table summarizes amortized cost, gross unrealized gain, gross unrealized loss and fair value of available-for-sale securities as of December 31, 2018 and 2017 (in thousands):

	December 31, 2018								December 31, 2017
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value		Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss (1)			Fair Value
Available-for-sale securities:
Convertible debt securities	$	—	$	—	$	—	$	—	$	10,205	$	1,653	$	(504	)	$	11,354
Redeemable preferred shares	9,961		379		—		10,340		15,431		—		—			15,431
Total available-for-sale securities	$	9,961	$	379	$	—	$	10,340	$	25,636	$	1,653	$	(504	)	$	26,785

(1) Gross unrealized loss is related to one security that was in a loss position for greater than 12 months as of December 31, 2017.

In September 2018, we sold an available-for-sale security for total consideration of $8.6 million, which approximated its carrying amount and amortized cost as of the closing date.

We recorded $5.6 million and $2.9 million of other-than-temporary impairments of available-for-sale investments for the years ended December 31, 2018 and 2017, respectively. Those impairments are classified within Other income (expense), net on the consolidated statement of operations.

Fair Value Option Investments    

In connection with the dispositions of controlling stakes in Ticket Monster, an entity based in the Republic of Korea, in May 2015 and Groupon India in August 2015, we obtained minority investments in Monster Holdings LP

("Monster LP") and in Nearbuy Pte Ltd. ("Nearbuy"). We have made an irrevocable election to account for both of those investments at fair value with changes in fair value reported in earnings. We elected to apply fair value accounting to those investments because we believe that fair value is the most relevant measurement attribute for those investments, as well as to reduce operational and accounting complexity. We determined that the fair value of our investments in Monster LP and Nearbuy were $69.4 million and $4.5 million as of December 31, 2018, and $78.9 million and $4.0 million as of December 31, 2017.

The following table summarizes gains and losses due to changes in fair value of those investments for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017		2016
Monster LP	$	(9,509	)	$	249	$	(35,350	)
Nearbuy	445			133		(12,791		)
Total	$	(9,064	)	$	382	$	(48,141	)

Monster LP

In May 2015, we completed the sale of a controlling stake in Ticket Monster to an investor group, whereby (a) the investor group contributed $350.0 million in cash to Monster LP, a newly-formed limited partnership, in exchange for 70,000,000 Class A units of Monster LP and (b) we contributed all of the issued and outstanding share capital of Ticket Monster to Monster LP in exchange for (i) 64,000,000 Class B units of Monster LP and (ii) $285.0 million in cash consideration. Mr. Daniel Shin, the chief executive officer and founder of Ticket Monster, contributed $10.0 million of cash consideration to Monster LP shortly after the closing date in exchange for 2,000,000 Class A units of Monster LP. Additionally, Monster LP was authorized to issue 20,321,839 Class C units to its management, subject to vesting conditions. Under the terms of the Partnership’s amended and restated agreement of limited partnership, its general partner established a Board of Directors and irrevocably assigned the rights to carry out any and all of the objectives and purposes of the partnership to its Board. The general partner is not entitled to receive any distributions.

During the fourth quarter of 2015, the Company sold 2,515,461 Class B units for $4.8 million to Mr. Daniel Shin and other employees of Ticket Monster, which resulted in a gain of $0.1 million.

In January 2016, all 20,321,839 of the authorized Class C units were granted to Monster LP’s employees. Those share-based payment awards are subject to time-based vesting conditions and, for a portion of the Class C units, a performance-based vesting condition.

In December 2016, Monster LP issued a new class of partnership units (Class A-1) to its controlling investor group and a new investor for total proceeds of $65.0 million. The fair value of Monster LP implied by the terms of the $65.0 million equity financing transaction in December 2016 was lower than its estimated fair value in previous periods, which resulted in a significant decrease in the fair value of our investment for the year ended December 31, 2016.

In February 2017, we participated in a recapitalization transaction with Monster LP whereby it exchanged all 61,484,539 of its Class B units for 16,609,195 newly issued Class A-1 units. The Class B units previously held were then distributed from Monster LP to its controlling investor group and certain other existing unit holders. Upon closing of the transaction, we own 57% of the outstanding Class A-1 units, which represents 9% of the total outstanding partnership units.

Following the February 2017 recapitalization transaction, the Class A-1 units are entitled to an $150.0 million liquidation preference, including an $85.0 million liquidation preference attributable to the Class A-1 units held by us, which must be paid prior to any distributions to the holders of the Class A-2, Class B and Class C units. Class A-1 unit holders are also entitled to share in distributions between $950.0 million and $1,494.0 million in accordance with the terms of Monster LP's distribution waterfall and in distributions in excess of $1,494.0 million based on their pro rata ownership of total outstanding partnership units. As a result of the February 2017 recapitalization transaction, we currently hold an investment in the most senior equity units in Monster LP’s capital structure. However, while providing

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more downside protection, those Class A-1 units provide less opportunity for appreciation than the Class B units previously held by us.

The following tables summarize the condensed financial information for Monster LP as of December 31, 2018 and 2017 and for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017			2016
Revenue	$	416,042		$	280,612		$	216,119
Gross profit	27,838			37,773			24,774
Loss before income taxes	(132,276		)	(124,873		)	(153,882		)
Net loss	(132,276		)	(124,873		)	(153,882		)

	December 31,
	2018		2017
Current assets	$	85,844	$	174,051
Non-current assets	482,505		520,105
Current liabilities	432,133		438,988
Non-current liabilities	78,434		60,977

Nearbuy

In August 2015, Groupon India completed an equity financing transaction with a third-party investor that obtained a majority voting interest in the entity, whereby (a) the investor contributed $17.0 million in cash to Nearbuy, a newly formed Singapore-based entity, in exchange for Series A Preference Shares and (b) we contributed the shares of Groupon India to Nearbuy in exchange for seed preference shares of Nearbuy. In January 2017, Nearbuy issued additional Series A Preference Shares to its controlling investor for total proceeds of $3.0 million. Upon closing of that transaction, the Series A Preference Shares are entitled to a $20.0 million liquidation preference, which must be paid prior to any distributions to other equity holders.

In December 2017, Nearbuy sold its subsidiary Nearbuy India Pte Ltd., which represented substantially all of its business operations, to a third-party investor in exchange for a minority investment in the acquirer.

The following tables summarize the condensed financial information for Nearbuy as of December 31, 2018 and 2017 and for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017		2016
Revenue	$	6,016		$	3,839	$	3,024
Gross profit	5,857			3,405		2,570
Income (loss) before income taxes (1)	(13,594		)	15,122		(15,701		)
Net income (loss) (1)	(13,594		)	15,122		(15,701		)

	December 31,
	2018		2017
Current assets	$	5,286	$	41
Non-current assets	46,940		18,362
Current liabilities	4,015		—
Non-current liabilities	144		—

(1) Nearbuy's income before income taxes and net income for the year ended December 31, 2017 includes a $22.6 million gain from the sale of its subsidiary Nearbuy India Pte Ltd.

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Other Equity Investments

In March 2017, in connection with the disposition of Groupon Israel, we retained a minority investment in the entity. The investment was recorded at its $0.4 million fair value at initial recognition and is accounted for as an other equity investment.

In May 2016, we acquired a 13% minority investment in the preferred stock of a restaurant software provider as consideration for the sale of Breadcrumb. The preferred stock was recorded at its $8.3 million acquisition date fair value and was accounted for as an other equity investment. In July 2017, we sold that investment for total consideration of $16.0 million, consisting of $14.7 million received in cash and $1.3 million that the acquirer paid into an escrow account that will be settled within 18 months of closing. We recognized a pretax gain on the disposition of $7.6 million, which is classified within Other income (expense), net on the consolidated statement of operations.

We recorded a $4.6 million impairment of an other equity investment for the year ended December 31, 2018. That impairment is classified within Other income (expense), net on the consolidated statements of operations.

8. SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION

The following table summarizes other income (expense), net for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017			2016
Interest income	$	6,420		$	3,287		$	1,808
Interest expense	(21,909		)	(20,680		)	(15,912		)
Changes in fair value of investments	(9,064		)	382			(48,141		)
Gain on sale of investment	—			7,624			—
Foreign currency gains (losses), net	(20,325		)	18,634			(6,927		)
Impairments of investments	(10,156		)	(2,944		)	—
Other	2,026			407			(2,117		)
Other income (expense), net	$	(53,008	)	$	6,710		$	(71,289	)

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The following table summarizes prepaid expenses and other current assets as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Merchandise inventories	$	33,739	$	25,528
Prepaid expenses	28,209		40,399
Income taxes receivable	6,717		10,299
Other	19,450		17,799
Total prepaid expenses and other current assets	$	88,115	$	94,025

The following table summarizes accrued merchant and supplier payables as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Accrued merchant payables	$	371,279	$	459,662
Accrued supplier payables (1)	280,502		310,673
Total accrued merchant and supplier payables	$	651,781	$	770,335

(1) Amounts include payables to suppliers of inventories and providers of shipping and fulfillment services.

The following table summarizes accrued expenses and other current liabilities as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Refund reserve	$	27,957	$	31,275
Compensation and benefits	56,173		73,096
Accrued marketing	39,094		32,912
Customer credits	15,118		28,487
Income taxes payable	8,987		9,645
Deferred revenue	25,452		29,539
Current portion of capital lease obligations	17,207		25,958
Other	77,046		100,284
Total accrued expenses and other current liabilities	$	267,034	$	331,196

The following table summarizes other non-current liabilities as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Contingent income tax liabilities	$	39,858	$	43,699
Deferred rent	32,186		29,032
Capital lease obligations	12,481		18,500
Deferred income taxes	6,619		811
Other	9,544		10,366
Total other non-current liabilities	$	100,688	$	102,408

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The following table summarizes the components of accumulated other comprehensive income as of December 31, 2018 and 2017 (in thousands):

	Foreign currency translation adjustments			Unrealized gain (loss) on available-for-sale securities			Pension adjustments			Total
Balance as of December 31, 2015	$	52,261		$	458		$	(1,513	)	$	51,206
Other comprehensive income (loss) before reclassification adjustments	6,579			(70		)	830			7,339
Reclassification adjustments included in net income (loss)	(591		)	—			98			(493		)
Other comprehensive income (loss)	5,988			(70		)	928			6,846
Balance as of December 31, 2016	58,249			388			(585		)	58,052
Other comprehensive income (loss) before reclassification adjustments	(12,382		)	(1,109		)	—			(13,491		)
Reclassification adjustments included in net income (loss)	(14,905		)	1,603			585			(12,717		)
Other comprehensive income (loss)	(27,287		)	494			585			(26,208		)
Balance as of December 31, 2017	30,962			882			—			31,844
Other comprehensive income (loss) before reclassification adjustments	3,332			(841		)	—			2,491
Reclassification adjustments included in net income (loss)	—			106			—			106
Other comprehensive income (loss)	3,332			(735		)	—			2,597
Reclassification for impact of U.S. tax rate change	—			161			—			161
Balance as of December 31, 2018	$	34,294		$	308		$	—		$	34,602

The effects of amounts reclassified from accumulated other comprehensive income to net income (loss) for the years ended December 31, 2018, 2017 and 2016 are presented within the following line items in the consolidated statements of operations (in thousands):

	Year Ended December 31,								Consolidated Statements of Operations Line Item
	2018		2017			2016
Foreign currency translation adjustments
Loss (gain) on dispositions - continuing operations	$	—	$	—		$	(7,468	)	Gains on business dispositions
Loss (gain) on country exits - continuing operations	—		(187		)	(55		)	Other income (expense), net
Loss (gain) on dispositions - discontinued operations	—		(14,718		)	6,932			Income (loss) from discontinued operations, net of tax
Reclassification adjustments	—		(14,905		)	(591		)
Unrealized gain (loss) on available-for-sale securities
Other-than-temporary impairment of available-for-sale security	—		2,944			—			Other income (expense), net
Realized gain on investment	106		(1,341		)	—			Other income (expense), net
Less: Tax effect	—		—			—			Provision (benefit) for income taxes
Reclassification adjustment	106		1,603			—
Pension adjustments
Curtailment gain	—		583			—			Selling, general and administrative
Amortization of net actuarial loss (gain)	—		2			116			Selling, general and administrative
Less: Tax effect	—		—			(18		)	Provision (benefit) for income taxes
Reclassification adjustment	—		585			98
Total reclassification adjustments	$	106	$	(12,717	)	$	(493	)

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9. FINANCING ARRANGEMENTS

Convertible Senior Notes

On April 4, 2016, we issued $250.0 million in aggregate principal amount of convertible senior notes (the "Notes") in a private placement to A-G Holdings, L.P. ("AGH"). Michael Angelakis, the chairman and chief executive officer of Atairos Group, Inc. ("Atairos"), joined our Board of Directors in connection with the issuance of the Notes. Atairos controls the voting power of AGH. The net proceeds from this offering were $243.2 million after deducting issuance costs. The Notes bear interest at a rate of 3.25% per annum, payable annually in arrears on April 1 of each year, beginning on April 1, 2017. The Notes will mature on April 1, 2022, subject to earlier conversion or redemption.

Each $1,000 of principal amount of the Notes initially is convertible into 185.1852 shares of common stock, which is equivalent to an initial conversion price of $5.40 per share, subject to adjustment upon the occurrence of specified events. Upon conversion, we can elect to settle the conversion value in cash, shares of our common stock, or any combination of cash and shares of our common stock. Holders of the Notes may convert their Notes at their option at any time until the close of business on the scheduled trading day immediately preceding the maturity date. In addition, if specified corporate events occur prior to the maturity date, we may be required to increase the conversion rate for holders who elect to convert based on the effective date of such event and the applicable stock price attributable to the event, as set forth in a table contained in the indenture governing the Notes (the "Indenture"). Based on the closing price of the common stock of $3.20 as of December 31, 2018, the if-converted value of the Notes was less than the principal amount.

With certain exceptions, upon a fundamental change (as defined in the Indenture), the holders of the Notes may require us to repurchase all or a portion of their Notes for cash at a purchase price equal to the principal amount plus accrued and unpaid interest. In addition, we may redeem the Notes, at our option, at a purchase price equal to the principal amount plus accrued and unpaid interest on or after April 1, 2020, if the closing sale price of the common stock exceeds 150% of the then-current conversion price for 20 or more trading days in the 30 consecutive trading day period preceding the exercise of this redemption right.

The Notes are senior unsecured obligations that rank equal in right of payment to all senior unsecured indebtedness and rank senior in right of payment to any indebtedness that is contractually subordinated to the Notes.

The Indenture includes customary events of default. If an event of default, as defined in the Indenture, occurs and is continuing, the principal amount of the Notes and any accrued and unpaid interest may be declared immediately due and payable. In the case of bankruptcy or insolvency, the principal amount of the Notes and any accrued and unpaid interest would automatically become immediately due and payable.

We have separated the Notes into their liability and equity components in the accompanying consolidated balance sheets. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated conversion feature. The carrying amount of the equity component, representing the conversion option, was determined by deducting the fair value of the liability component from the principal amount of the Notes. The difference between the principal amount of the Notes and the liability component (the "debt discount") is amortized to interest expense at an effective interest rate of 9.75% over the term of the Notes. The equity component of the Notes is included in additional paid-in capital in the consolidated balance sheets and is not remeasured as long as it continues to meet the conditions for equity classification.

We incurred transaction costs of approximately $6.8 million related to the issuance of the Notes. Those transaction costs were allocated to the liability and equity components in the same manner as the allocation of the proceeds from the Notes. Transaction costs attributable to the liability component of $4.8 million were recorded as a debt discount in the consolidated balance sheet and are being amortized to interest expense over the term of the Notes. Transaction costs attributable to the equity component of $2.0 million were recorded in stockholders' equity as a reduction of the equity component.

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The carrying amount of the Notes consisted of the following as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018			2017
Liability component:
Principal amount	$	250,000		$	250,000
Less: debt discount	(48,331		)	(60,247		)
Net carrying amount of liability component	$	201,669		$	189,753
Net carrying amount of equity component	$	67,014		$	67,014

The estimated fair value of the Notes as of December 31, 2018 and 2017was $257.1 million and $285.6 million, and was determined using a lattice model. We classified the fair value of the Notes as a Level 3 measurement due to the lack of observable market data over fair value inputs such as our stock price volatility over the term of the Notes and our cost of debt.

As of December 31, 2018, the remaining term of the Notes is approximately 3 years and 3 months. During the years ended December 31, 2018, 2017 and 2016, we recognized interest costs on the Notes as follows (in thousands):

	Year Ended December 31,
	2018		2017		2016
Contractual interest (3.25% of the principal amount per annum)	$	8,128	$	8,128	$	6,095
Amortization of debt discount	11,916		10,758		7,376
Total	$	20,044	$	18,886	$	13,471

Note Hedges and Warrants

In May 2016, we purchased convertible note hedges with respect to our common stock for a cost of $59.1 million from certain bank counterparties. The convertible note hedges provide us with the right to purchase up to 46.3 million shares of our common stock at an initial strike price of $5.40 per share, which corresponds to the initial conversion price of the Notes, and are exercisable upon conversion of the Notes. The convertible note hedges are intended to reduce the potential economic dilution upon conversion of the Notes. The convertible note hedges are separate transactions and are not part of the terms of the Notes. Holders of the Notes do not have any rights with respect to the convertible note hedges.

In May 2016, we also sold warrants for total cash proceeds of $35.5 million to certain bank counterparties. The warrants provide the counterparties with the right to purchase up to 46.3 million shares of our common stock at a strike price of $8.50 per share. The warrants expire on various dates between July 1, 2022 and August 26, 2022 and are exercisable on their expiration dates. The warrants are separate transactions and are not part of the terms of the Notes or convertible note hedges. Holders of the Notes and convertible note hedges do not have any rights with respect to the warrants.

The amounts paid and received for the convertible note hedges and warrants were recorded in additional paid-in capital in the consolidated balance sheets as of December 31, 2018 and 2017. The convertible note hedges and warrants are not remeasured as long as they continue to meet the conditions for equity classification. The amounts paid for the convertible note hedges are tax deductible over the term of the Notes, while the proceeds received from the warrants are not taxable. 

Under the if-converted method, the shares of common stock underlying the conversion option in the Notes are included in the diluted earnings per share denominator and the interest expense on the Notes, net of tax, is added to the numerator. However, upon conversion, there will be no economic dilution from the Notes, as exercise of the convertible note hedges eliminates any dilution from the Notes that would have otherwise occurred when the price of our common stock exceeds the conversion price. Taken together, the purchase of the convertible note hedges and

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sale of warrants are intended to offset any actual dilution from the conversion of the Notes and to effectively increase the overall conversion price from $5.40 to $8.50 per share.

Revolving Credit Agreement

The amended and restated senior secured revolving credit agreement entered into in June 2016 (the "Amended and Restated Credit Agreement") provides for aggregate principal borrowings of up to $250.0 million and matures in June 2019. Borrowings under the Amended and Restated Credit Agreement bear interest, at our option, at a rate per annum equal to the Alternate Base Rate or Adjusted LIBO Rate (each as defined in the Amended and Restated Credit Agreement) plus an additional margin ranging between 0.50% and 2.25%. We are required to pay quarterly commitment fees ranging from 0.25% to 0.40% per annum of the average daily amount of unused commitments available under the Amended and Restated Credit Agreement. The Amended and Restated Credit Agreement also provides for the issuance of up to $45.0 million in letters of credit, provided that the sum of outstanding borrowings and letters of credit do not exceed the maximum funding commitment of $250.0 million.

The Amended and Restated Credit Agreement is secured by substantially all of our tangible and intangible assets, including a pledge of 100% of the outstanding capital stock of substantially all of our direct and indirect domestic subsidiaries and 65% of the shares or equity interests of first-tier foreign subsidiaries and each U.S. entity whose assets substantially consist of capital stock and/or intercompany debt of one or more foreign subsidiaries, subject to certain exceptions. Certain of our domestic subsidiaries are guarantors under the Amended and Restated Credit Agreement.

The Amended and Restated Credit Agreement contains various customary restrictive covenants that limit our ability to, among other things: incur additional indebtedness; make dividend and other restricted payments, including share repurchases; enter into sale and leaseback transactions; make investments, loans or advances; grant or incur liens on assets; sell assets; engage in mergers, consolidations, liquidations or dissolutions; and engage in transactions with affiliates. The Amended and Restated Credit Agreement requires us to maintain compliance with specified financial covenants, comprised of a minimum fixed charge coverage ratio, a maximum leverage ratio, a maximum senior secured indebtedness ratio and a minimum liquidity ratio, each as set forth in the Amended and Restated Credit Agreement. We are also required to maintain, as of the last day of each fiscal quarter, unrestricted cash of at least $400.0 million, including $200.0 million in accounts held with lenders under the Amended and Restated Credit Agreement or their affiliates. Non-compliance with these covenants may result in termination of the commitments under the Amended and Restated Credit Agreement and any then outstanding borrowings may be declared due and payable immediately. We have the right to terminate the Amended and Restated Credit Agreement or reduce the available commitments at any time.

As of December 31, 2018 and 2017, we have no borrowings and have outstanding letters of credit of $19.2 million and $22.7 million, under the Amended and Restated Credit Agreement.

10. COMMITMENTS AND CONTINGENCIES

Leases

We have entered into various non-cancelable operating lease agreements for our offices and data centers throughout the world with lease expirations between 2019 and 2026. Rent expense under operating leases was$40.1 million,$42.5 million and $45.4 million for the years ended December 31, 2018, 2017 and 2016. Sublease income was $6.5 million, $7.1 million and $2.7 million for the years ended December 31, 2018, 2017 and 2016.

We lease our headquarters located in Chicago, Illinois ("600 West Chicago"). Our lease agreement for 600 West Chicago extends through January 31, 2026 and includes rent escalations that range from one to two percent per year, as well as expansion options and a five-year renewal option. The 600 West Chicago lease represents $87.5 million of the estimated future payments under operating leases shown in the table below. We account for the 600 West Chicago lease as an operating lease and recognize rent expense on a straight-line basis, taking into account rent escalations and lease incentives.

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Certain of our computer hardware has been acquired under capital lease agreements, with expirations between 2019 and 2022.

We are responsible for paying our proportionate share of specified operating expenses and real estate, personal property and lease taxes under certain of our operating and capital leases agreements.

As of December 31, 2018, the future payments under operating leases and capital leases for each of the next five years and thereafter are as follows (in thousands):    

	Capital Leases			Operating Leases
2019	$	18,169		$	32,533
2020	7,634			31,116
2021	4,784			26,876
2022	687			26,097
2023	—			21,944
Thereafter	—			31,633
Total minimum lease payments	31,274			$	170,199
Less: Amount representing interest	(1,586		)
Present value of net minimum capital lease payments	29,688
Less: Current portion of capital lease obligations	(17,207		)
Total long-term capital lease obligations	$	12,481

As of December 31, 2018, the future amounts due under subleases for each of the next five years and thereafter are as follows (in thousands):

	Subleases
2019	$	5,206
2020	5,027
2021	5,065
2022	5,103
2023	4,385
Thereafter	4,891
Total future sublease income	$	29,677

Purchase Obligations

We have entered into non-cancelable arrangements with third-parties, primarily related to cloud computing and other information technology services. As of December 31, 2018, future payments under these contractual obligations were as follows (in thousands):

2019	$	13,266
2020	7,300
2021	3,400
2022	3,400
2023	—
Thereafter	—
Total purchase obligations	$	27,366

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Legal Matters and Other Contingencies

From time to time, we are party to various legal proceedings incident to the operation of our business. For example, we currently are involved in proceedings brought by former employees and merchants, intellectual property infringement suits, customer lawsuits, consumer class actions and suits alleging, among other things, violations of state consumer protection or privacy laws. The following is a brief description of significant legal proceedings.

On March 2, 2016, International Business Machines Corporation ("IBM") filed a complaint in the United States District Court for the District of Delaware against us (the "Delaware Action"). In the Delaware Action, IBM alleged that we infringed certain IBM patents that IBM claimed relate to the presentation of applications and advertising in an interactive service, preserving state information in online transactions and single sign-on processes in a computing environment and sought damages (including a request that the amount of compensatory damages be trebled), injunctive relief and costs and reasonable attorneys’ fees. On July 27, 2018, a jury in this matter returned a verdict finding we willfully infringed each of these patents and awarded damages of $82.5 million to IBM.

On May 9, 2016, we filed a complaint in the United States District Court for the Northern District of Illinois against IBM (the "Illinois Action"). We alleged that IBM infringed one of our patents relating to location-based services.

On September 28, 2018, we entered into settlement and license agreements with IBM fully resolving the Delaware Action, the Illinois Action and related proceedings with IBM. The settlement terms provide for the payment of $57.5 million to IBM, a cross-license to the parties’ respective patent portfolios, mutual releases of claims and the dismissal with prejudice of the Delaware Action and the Illinois Action. On October 1, 2018, the court in the Illinois Action entered an order dismissing the Illinois Action with prejudice. On October 2, 2018, the court in the Delaware Action entered an order dismissing the Delaware Action with prejudice.

We allocated the settlement amount between the litigation settlement component and the license for future use of the patented technology based on their relative fair values, which resulted in a $34.6 million charge recorded within Selling, general and administrative expense in our consolidated statements of operations to increase our contingent liability and $15.4 million that was capitalized for the license to use the patented technology in future periods under the terms of the settlement and license agreements.

In addition, other third parties have from time to time claimed, and others may claim in the future, that we have infringed their intellectual property rights. We are subject to intellectual property disputes, including patent infringement claims, and expect that we will continue to be subject to intellectual property infringement claims as our services expand in scope and complexity. In the past, we have litigated such claims, and we are presently involved in several patent infringement and other intellectual property-related claims, including pending litigation or trademark disputes relating to, for example, our Goods category, some of which could involve potentially substantial claims for damages or injunctive relief. We may also become more vulnerable to third-party claims as laws such as the Digital Millennium Copyright Act are interpreted by the courts, and we become subject to laws in jurisdictions where the underlying laws with respect to the potential liability of online intermediaries are either unclear or less favorable. We believe that additional lawsuits alleging that we have violated patent, copyright or trademark laws will be filed against us. Intellectual property claims, whether meritorious or not, are time consuming and often costly to resolve, could require expensive changes in our methods of doing business or the goods we sell, or could require us to enter into costly royalty or licensing agreements.

We also are subject to consumer claims or lawsuits relating to alleged violations of consumer protection or privacy rights and statutes, some of which could involve potentially substantial claims for damages, including statutory or punitive damages. Consumer and privacy related claims or lawsuits, whether meritorious or not, could be time consuming, result in costly litigation, damage awards, fines and penalties, injunctive relief or increased costs of doing business through adverse judgment or settlement, or require us to change our business practices, sometimes in expensive ways.

We are also subject to, or in the future may become subject to, a variety of regulatory inquiries, audits, and investigations across the jurisdictions where we conduct our business, including, for example, inquiries related to consumer protection, employment matters and/or hiring practices, marketing practices, tax, unclaimed property and privacy rules and regulations. Any regulatory actions against us, whether meritorious or not, could be time consuming, result in costly litigation, damage awards, fines and penalties, injunctive relief or increased costs of doing business

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through adverse judgment or settlement, require us to change our business practices in expensive ways, require significant amounts of management time, result in the diversion of significant operational resources or otherwise harm our business.

We establish an accrued liability for loss contingencies related to legal and regulatory matters when the loss is both probable and reasonably estimable. Those accruals represent management's best estimate of probable losses and, in such cases, there may be an exposure to loss in excess of the amounts accrued. For certain of the matters described above, there are inherent and significant uncertainties based on, among other factors, the stage of the proceedings, developments in the applicable facts of law, or the lack of a specific damage claim. However, we believe that the amount of reasonably possible losses in excess of the amounts accrued for those matters would not have a material adverse effect on our business, consolidated financial position, results of operations or cash flows. Our accrued liabilities for loss contingencies related to legal and regulatory matters may change in the future as a result of new developments, including, but not limited to, the occurrence of new legal matters, changes in the law or regulatory environment, adverse or favorable rulings, newly discovered facts relevant to the matter, or changes in the strategy for the matter. Regardless of the outcome, litigation and other regulatory matters can have an adverse impact on us because of defense and settlement costs, diversion of management resources and other factors.

Indemnifications

In connection with the dispositions of our operations in Latin America (see Note 3, Discontinued Operations and Other Business Dispositions), we agreed to indemnify the buyer for certain tax and other matters. The indemnification liabilities were initially recorded at their fair value, estimated to be $5.4 million using a probability-weighted expected cash flow approach, upon closing of the transactions as an adjustment to the net loss on the dispositions within discontinued operations. We estimate that the total amount of obligations that are reasonably possible to arise under the indemnifications in excess of amounts accrued as of December 31, 2018 is approximately $18.0 million.

In the normal course of business to facilitate transactions related to our operations, we indemnify certain parties, including employees, lessors, service providers, merchants, and counterparties to investment agreements and asset and stock purchase agreements with respect to various matters. We have agreed to hold certain parties harmless against losses arising from a breach of representations or covenants, or other claims made against those parties. These agreements may limit the time within which an indemnification claim can be made and the amount of the claim. We are also subject to increased exposure to various claims as a result of our divestitures and acquisitions, particularly in cases where we are entering into new businesses in connection with such acquisitions. We may also become more vulnerable to claims as we expand the range and scope of our services and are subject to laws in jurisdictions where the underlying laws with respect to potential liability are either unclear or less favorable. In addition, we have entered into indemnification agreements with our officers, directors and underwriters, and our bylaws contain similar indemnification obligations that cover officers, directors, employees and other agents. 

Except as noted above, it is not possible to determine the maximum potential amount under these indemnification agreements due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. Historically, any payments that we have made under these agreements have not had a material impact on the operating results, financial position or cash flows.

11. STOCKHOLDERS' EQUITY

Preferred Stock

Our Board of Directors (the "Board") has the authority, without approval by the stockholders, to issue up to a total of 50,000,000 shares of preferred stock in one or more series. The Board may establish the number of shares to be included in each such series and may fix the designations, preferences, powers and other rights of the shares of a series of preferred stock. The Board could authorize the issuance of preferred stock with voting or conversion rights that could dilute the voting power or rights of the holders of our common stock. As of December 31, 2018 and 2017, there were no shares of preferred stock outstanding.

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Common Stock

Prior to October 31, 2016, our certificate of incorporation, as amended and restated, authorized three classes of common stock: Class A common stock, Class B common stock and common stock. On October 31, 2016, each share of our Class A common stock and Class B common stock automatically converted into a single class of common stock pursuant to the terms of our sixth amended and restated certificate of incorporation. Upon conversion, all shares of Class A common stock and Class B common stock were retired.

Pursuant to our restated certificate of incorporation, the Board has the authority to issue up to a total of 2,010,000,000 shares of common stock. Each holder of common stock shall be entitled to one vote for each such share on any matter that is submitted to a vote of stockholders. In addition, holders of the common stock will vote as a single class of stock on any matter that is submitted to a vote of stockholders.

Prior to October 31, 2016, holders of Class A common stock and Class B common stock had identical rights, except that holders of Class A common stock were entitled to one vote per share and holders of Class B common stock were entitled to 150 votes per share.

Share Repurchase Program

In May 2018, the Board authorized us to repurchase up to $300.0 million of our common stock under a new share repurchase program. The prior share repurchase program, which authorized repurchases up to $700.0 million, expired in April 2018. During the year ended December 31, 2018, we repurchased 3,252,886 shares for an aggregate purchase price of $10.0 million (including fees and commissions) under the new repurchase program. No amounts were repurchased under the prior share repurchase program during the year ended December 31, 2018. As of December 31, 2018, up to $290.0 million of common stock remained available for purchase under the new program. The timing and amount of share repurchases, if any, will be determined based on market conditions, limitations under the Amended and Restated Credit Agreement, share price and other factors, and the share repurchase program may be terminated at any time.

12. COMPENSATION ARRANGEMENTS

Groupon, Inc. Stock Plans

In January 2008, we adopted the 2008 Stock Option Plan, as amended (the "2008 Plan"), under which options for up to 64,618,500 shares of common stock were authorized to be issued to employees, consultants and directors. The 2008 Plan was frozen in December 2010. In April 2010, we established the Groupon, Inc. 2010 Stock Plan, as amended in April 2011 (the "2010 Plan"), under which options and restricted stock units ("RSUs") for up to 20,000,000 shares of common stock were authorized for future issuance to employees, consultants and directors. No new awards may be granted under the 2010 Plan following our initial public offering in November 2011. In August 2011,we established the Groupon, Inc. 2011 Stock Plan (the "2011 Plan"), as amended in November 2013, May 2014 and June 2016, under which options, RSUs and performance stock units for up to 150,000,000 shares of common stock were authorized for future issuance to employees, consultants and directors.

The Groupon, Inc. Stock Plans described above (the "Plans") are administered by the Compensation Committee of the Board (the "Compensation Committee"). As of December 31, 2018, 54,927,088 shares of common stock were available for future issuance under the Plans.

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The stock-based compensation expense related to stock awards issued under the Plans and acquisition-related awards are presented within the following line items of the consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
Cost of revenue	$	1,485	$	2,658	$	3,940
Marketing	6,948		7,949		8,929
Selling, general and administrative	56,288		70,343		96,654
Restructuring charges	—		849		4,749
Other income (expense), net	100		245		851
Total stock-based compensation expense	$	64,821	$	82,044	$	115,123

We recognized stock-based compensation from discontinued operations of $0.2 million and $3.1 million for the years ended December 31, 2017 and 2016. We also capitalized $7.4 million, $6.2 million, and $9.3 million of stock-based compensation for the years ended December 31, 2018, 2017 and 2016, in connection with internally-developed software. As of December 31, 2018, $95.2 million of unrecognized compensation costs related to unvested employee stock awards are expected to be recognized over a remaining weighted-average period of 1.35 years.

Employee Stock Purchase Plan

We are authorized to grant up to 10,000,000 shares of common stock under our employee stock purchase plan. For the years ended December 31, 2018, 2017 and 2016, 1,621,061, 1,879,656 and 1,669,782 shares of common stock were issued under the ESPP.

Restricted Stock Units

The restricted stock units granted under the Plans generally have vesting periods between one and four years and are amortized on a straight-line basis over their requisite service period. Additionally, we are required to issue restricted stock units to settle amounts that exceed targeted bonus amounts under our primary bonus plans. We account for those obligations as a liability-classified award with performance conditions. The table below summarizes restricted stock unit activity under the Plans for the year ended December 31, 2018:

	Restricted Stock Units			Weighted- Average Grant Date Fair Value (per share)
Unvested at December 31, 2017	$	28,939,110		$	4.32
Granted	19,376,465			4.59
Vested	(15,226,639		)	4.46
Forfeited	(6,465,504		)	4.31
Unvested at December 31, 2018	$	26,623,432		$	4.47

The weighted-average grant date fair value of restricted stock units granted in 2017 and 2016 was $4.10 and $3.93. The fair value of restricted stock units that vested during each of the three years ended December 31, 2018, 2017 and 2016 was $64.1 million, $67.0 million and $88.2 million.

Performance Share Units

The performance share units granted under the Plans vest in shares of our common stock upon the achievement of financial and operational targets specified in the respective award. The awards are subject to both continued employment through the performance period dictated by the award and certification by the Compensation Committee that the specified financial and operational targets have been achieved.

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During the year ended December 31, 2018, we granted performance share units for which the maximum number of common shares issuable upon vesting was 7,972,780 shares and the weighted-average grant date fair value was $4.88 per unit. Based on our financial and operational results for the year ended December 31, 2018, 1,261,730 shares with a total grant date fair value of $6.2 million became issuable upon vesting of the performance share units following the Compensation Committee's approval in February 2019.

During the year ended December 31, 2018, 278,635 shares of our common stock were issued related to performance share units granted in the previous year following the Compensation Committee's certification of the financial and operational metrics for the year ended December 31, 2017. The weighted-average grant date fair value of those units was $3.78 per share. The fair value of the performance share units that vested during the year ended December 31, 2018 was $1.3 million.

Restricted Stock Awards

We previously granted restricted stock awards in connection with business combinations. Compensation expense on those awards was recognized on a straight-line basis over the requisite service periods of the awards. During the year ended December 31, 2017, 1.2 million restricted shares with a fair value of $5.2 million vested. The fair value of restricted stock that vested during the year ended December 31, 2016 was $2.2 million. There were no restricted shares outstanding as of December 31, 2017.

Stock Options

The exercise price of stock options granted is equal to the fair value of the underlying stock on the date of grant. The contractual term for stock options expires ten years from the grant date. Stock options generally vested over a three- or four-year period, with 25% of the awards vesting after one year and the remainder of the awards vesting on a monthly or quarterly basis thereafter.

The table below summarizes the stock option activity for the year ended December 31, 2018:

	Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands) (1)
Outstanding and exercisable at December 31, 2017	$	885,580		$	0.62	1.76	$	3,967
Exercised	(672,793		)	0.12
Forfeited	—			—
Outstanding and exercisable at December 31, 2018	$	212,787		1.80		1.37	$	298

(1) The aggregate intrinsic value of options outstanding and exercisable represents the total pretax intrinsic value (the difference between the fair value of our stock on the last day of each period and the exercise price, multiplied by the number of options where the fair value exceeds the exercise price) that would have been received by the option holders had all option holders exercised their options as of December 31, 2018 and 2017, respectively.

We did not grant any stock options during the years ended December 31, 2018, 2017 and 2016. The total intrinsic value of options that were exercised during the years ended December 31, 2018, 2017 and 2016 was $3.2 million, $4.0 million and $1.2 million.

13. REVENUE RECOGNITION

Product and service revenue are generated from sales transactions through our online marketplaces in three primary categories: Local, Goods and Travel.

Product revenue is earned from direct sales of merchandise inventory to customers and includes any related shipping fees. Service revenue primarily represents the net commissions earned from selling goods and services provided by third-party merchants. Those marketplace transactions generally involve the online delivery of a voucher that can be redeemed by the purchaser with the third-party merchant for goods or services (or for discounts on goods or services). To a lesser extent, service revenue also includes commissions earned when customers make purchases

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with retailers using digital coupons accessed through our websites and mobile applications. Additionally, in the United States we have recently been developing and testing voucherless offerings that are linked to customer credit cards. Customers claim those voucherless merchant offerings through our online marketplaces and earn cash back on their credit card statements when they transact with the related merchants, who pay us commissions for such transactions.

In connection with most of our product and service revenue transactions, we collect cash from credit card payment processors shortly after a sale occurs. For transactions in which we earn commissions when customers make purchases with retailers using digital coupons accessed through our websites and mobile applications, we generally collect payment from affiliate networks on terms ranging from 30 to 150 days.

As discussed in Note 2, Summary of Significant Accounting Policies, we previously referred to our product revenue and service revenue as "direct revenue" and "third-party and other revenue," respectively.

Adoption of ASC Topic 606, Revenue from Contracts with Customers

On January 1, 2018, we adopted Accounting Standards Codification Topic 606 using the modified retrospective method. Beginning on January 1, 2018, results are presented in accordance with the revised policies, while prior period amounts are not adjusted and continue to be reported in accordance with our historical policies. The adoption of Topic 606 did not significantly impact our presentation of revenue on a gross or net basis. The following changes resulted from the adoption of Topic 606:

• For merchant agreements with redemption payment terms, the merchant is not paid its share of the sale price for a voucher sold through one of our online marketplaces until the customer redeems the related voucher. If the customer does not redeem a voucher with such merchant payment terms, we retain all of the gross billings for that voucher, rather than retaining only our net commission. Prior to our adoption of Topic 606, we recognized that variable consideration from unredeemed vouchers and derecognized the related accrued merchant payables when our legal obligation to the merchant expired, which we believe is shortly after the voucher expiration date in most jurisdictions. Following our adoption of Topic 606, we estimate the variable consideration from vouchers that will not ultimately be redeemed and recognize that amount as revenue at the time of sale, rather than when our legal obligation expires. We estimate variable consideration from unredeemed vouchers using our historical voucher redemption experience. Most vouchers sold through the marketplace in the United States do not have expiration dates and redemption payment terms were not widely used in that jurisdiction before 2017, so the North America segment did not have variable consideration from unredeemed vouchers in prior periods.

• Prior to our adoption of Topic 606, we expensed the incremental costs to obtain contracts with third-party merchants, such as sales commissions, as incurred. Following our adoption of Topic 606, those costs are deferred and recognized over the expected period of the merchant arrangement, generally from 12 to 18 months. As of December 31, 2018, we had $2.9 million and $11.3 million of deferred contract acquisition costs recorded within Prepaid expenses and other current assets and Other non-current assets, respectively. For the year ended December 31, 2018, we amortized $25.2 million of deferred contract acquisition costs and did not recognize any impairment losses in relation to the deferred costs.

• Prior to our adoption of Topic 606, we recognized breakage income for unused customer credits when they expired or were forfeited. Following our adoption of Topic 606, breakage income from customer credits that are not expected to be used is estimated and recognized as revenue in proportion to the pattern of redemption for customer credits that are used.

• Prior to our adoption of Topic 606, we deferred the revenue from hotel reservation offerings until the customer's stay commenced. Following our adoption of Topic 606, revenue from hotel reservation offerings is recognized at the time the reservation is made, net of an allowance for estimated cancellations.

• Prior to our adoption of Topic 606, we classified refunds on service revenue transactions for which the merchant's share of the refund amount is not recoverable as a cost of revenue. Following our adoption of Topic 606, those refunds are classified as a reduction of revenue.

• Prior to our adoption of Topic 606, we classified credits issued to consumers for relationship purposes as a marketing expense. Following our adoption of Topic 606, those credits are classified as a reduction of revenue.

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We recorded a net reduction to our opening accumulated deficit of $88.9 million, which is net of a $6.7 million income tax effect, as of January 1, 2018 due to the cumulative impact of adopting Topic 606. The following table summarizes balance sheet accounts impacted by the cumulative effect of adopting Topic 606 (in thousands):

Account	Increase (decrease) to beginning accumulated deficit
Prepaid expenses and other current assets	$	(4,007	)
Other non-current assets	(10,223		)
Accrued merchant and supplier payables	(64,970		)
Accrued expenses and other current liabilities	(13,188		)
Other non-current liabilities	3,443
Effect on beginning accumulated deficit	$	(88,945	)

See Note 2,Summary of Significant Accounting Policies, for additional information about our revenue recognition policies after the adoption of Topic 606.

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Impacts on Consolidated Financial Statements

The following tables summarize the impacts of adopting Topic 606 on our consolidated financial statements as of and for the year ended December 31, 2018 (in thousands):

Consolidated Balance Sheet

	December 31, 2018
	As reported		Effects of Topic 606			Balances without adoption of Topic 606
Total assets	$	1,642,142	$	(10,948	)	$	1,631,194
Total liabilities	1,259,531		103,878			1,363,409
Total equity	382,611		(114,826		)	267,785

Consolidated Statements of Operations

	Year Ended December 31, 2018
	As reported			Effects of Topic 606			Balances without adoption of Topic 606
Revenue:
Service revenue (1)	$	1,205,487		$	522		$	1,206,009
Product revenue	1,431,259			—			1,431,259
Total revenue	2,636,746			522			2,637,268
Cost of revenue:
Service cost of revenue (2)	120,077			25,436			145,513
Product cost of revenue	1,196,068			—			1,196,068
Cost of revenue (2)	1,316,145			25,436			1,341,581
Gross profit	1,320,601			(24,914		)	1,295,687
Operating expenses:
Marketing (3)	395,737			7,867			403,604
Selling, general and administrative (4)	870,961			(3,092		)	867,869
Restructuring charges	(136		)	—			(136		)
Total operating expenses	1,266,562			4,775			1,271,337
Income (loss) from operations	54,039			(29,689		)	24,350
Other income (expense), net	(53,008		)	—			(53,008		)
Income (loss) before provision (benefit) for income taxes	1,031			(29,689		)	(28,658		)
Provision (benefit) for income taxes (5)	(957		)	(803		)	(1,760		)
Net income (loss)	$	1,988		$	(28,886	)	$	(26,898	)

(1) For the year ended December 31, 2018, the adoption of Topic 606 resulted in a $33.3 million decrease to Revenue for refunds on service revenue transactions for which the merchant's share is not recoverable and customer credits issued for relationship purposes, partially offset by increases of $27.2 million related to the timing of recognition of variable consideration from unredeemed vouchers, $2.6 million related to the timing of recognition of revenue from hotel reservation offerings and $3.0 million related to the timing of recognition of breakage revenue from customer credits that are not expected to be used.

(2) Reflects decreases to Cost of revenue following the adoption of Topic 606 for refunds on service revenue transactions for which the merchant's share is not recoverable.

(3) Reflects decreases to Marketing expense following the adoption of Topic 606 for customer credits issued for relationship purposes.

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(4) Reflects increases to Selling, general and administrative expense for the amortization of deferred contract acquisition costs in excess of amounts capitalized.

(5) For the year ended December 31, 2018, we recognized an income tax benefit of $6.4 million resulting from the impact of adopting Topic 606 on intercompany activity in certain foreign jurisdictions. That income tax benefit is not reflected in this table, which presents the direct impacts of adopting Topic 606.

Segment and Category Information

	Year Ended December 31, 2018
	As reported		Effects of Topic 606			Balances without adoption of Topic 606
North America
Service revenue:
Local	$	752,863	$	(1,050	)	$	751,813
Travel	71,856		(1,460		)	70,396
Goods	18,283		113			18,396
Product revenue - Goods	796,393		—			796,393
Total North America revenue	1,639,395		(2,397		)	1,636,998
International
Service revenue:
Local	306,700		2,286			308,986
Travel	41,183		(262		)	40,921
Goods	14,602		895			15,497
Product revenue - Goods	634,866		—			634,866
Total International revenue	997,351		2,919			1,000,270
Consolidated
Service revenue:
Local	1,059,563		1,236			1,060,799
Travel	113,039		(1,722		)	111,317
Goods	32,885		1,008			33,893
Product revenue - Goods	1,431,259		—			1,431,259
Total Consolidated Revenue	$	2,636,746	$	522		$	2,637,268

Contract Balances

A substantial majority of our deferred revenue relates to product sales for which revenue will be recognized as the products are delivered to customers, generally within one week following the balance sheet date. Our deferred revenue was $25.8 million and $25.5 million as of January 1, 2018 and December 31, 2018. The amount of revenue recognized for the year ended December 31, 2018 that was included in the deferred revenue balance at the beginning of the period was $25.1 million.

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The following table summarizes the activity in the liability for customer credits for the year ended December 31, 2018 (in thousands):

	Customer Credits
Balance as of January 1, 2018	$	19,414
Credits issued	126,874
Credits redeemed (1)	(112,161		)
Breakage revenue recognized	(18,802		)
Foreign currency translation	(207		)
Balance as of December 31, 2018	$	15,118

(1) Customer credits can be redeemed through our online marketplaces for goods or services provided by a third-party merchant or for merchandise inventory sold by us. When customer credits are redeemed for goods or services provided by a third-party merchant, service revenue is recognized on a net basis as the difference between the carrying amount of the customer credit liability derecognized and the amount due to the merchant for the related transaction. When customer credits are redeemed for merchandise inventory sold by us, product revenue is recognized on a gross basis equal to the amount of the customer credit liability derecognized. Customer credits are primarily used within one year of issuance.

14. RESTRUCTURING

In September 2015, we commenced a restructuring plan relating primarily to workforce reductions in our international operations. We have also undertaken workforce reductions in our North America segment. In addition to workforce reductions in our ongoing markets, we ceased operations in 17 countries within our International segment as part of the restructuring plan between September 2015 and March 2016. Those country exits, which generally comprised our smallest international markets, resulted from a series of separate decisions made at different times during that period that were not part of an overall strategic shift. Costs related to the restructuring plan are classified as Restructuring charges on the consolidated statements of operations. The actions under our restructuring plan were completed as of September 30, 2017 and substantially all of the cash payments for actions under that plan were disbursed as of December 31, 2018.

During the third quarter of 2017, we reached a decision to cease most of our food delivery operations and entered into a long-term commercial agreement with a subsidiary of Grubhub that will allow us to provide customers with the ability to order food delivery through our websites and mobile applications in the United States from Grubhub's network of restaurant merchants. See Note 6, Goodwill and Other Intangible Assets, for additional information. For the year ended December 31, 2017, our restructuring costs associated with ceasing those food delivery operations were $2.6 million, primarily related to employee severance. Additionally, we entered into an agreement to sell customer lists and other intangible assets in certain food delivery markets to Grubhub.

We incurred cumulative costs for employee severance and benefits and other exit costs of $80.1 million under the plan since its inception in September 2015. In addition to those costs, we incurred cumulative long-lived asset impairment charges of $7.5 million resulting from our restructuring activities. The amounts presented in Restructuring charges for the year ended December 31, 2018 reflect changes in estimates related to prior actions.

The following tables summarize costs incurred by segment related to the restructuring plan for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31, 2018
	Employee Severance and Benefit Costs			Asset Impairments		Other Exit Costs		Total Restructuring Charges
North America	$	—		$	—	$	177	$	177
International	(353		)	—		40		(313		)
Consolidated	$	(353	)	$	—	$	217	$	(136	)

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	Year Ended December 31, 2017
	Employee Severance and Benefit Costs (1)		Asset Impairments		Other Exit Costs		Total Restructuring Charges
North America	$	8,172	$	—	$	3,826	$	11,998
International	4,814		—		2,016		6,830
Consolidated	$	12,986	$	—	$	5,842	$	18,828

	Year Ended December 31, 2016
	Employee Severance and Benefit Costs (1)		Asset Impairments (2)		Other Exit Costs		Total Restructuring Charges
North America	$	8,548	$	45	$	3,304	$	11,897
International	25,499		283		2,759		28,541
Consolidated	$	34,047	$	328	$	6,063	$	40,438

(1) The employee severance and benefit costs for the years ended December 31, 2017 and 2016 related to the termination of approximately 750 and 900 employees.

(2) Asset impairments related to property, equipment and software that were determined to be impaired as a result of our restructuring activities.

The following table summarizes restructuring liability activity for the years ended December 31, 2018 and 2017 (in thousands):

	Employee Severance and Benefit Costs			Other Exit Costs			Total
Balance as of December 31, 2016	$	14,135		$	2,260		$	16,395
Charges payable in cash (1)	12,140			5,842			17,982
Cash payments	(23,117		)	(7,826		)	(30,943		)
Foreign currency translation	659			28			687
Balance as of December 31, 2017	$	3,817		$	304		$	4,121
Charges payable in cash	(353		)	217			(136		)
Cash payments	(2,256		)	(521		)	(2,777		)
Foreign currency translation	(89		)	—			(89		)
Balance as of December 31, 2018	$	1,119		$	—		$	1,119

(1) Excludes stock-based compensation of $0.8 million related to accelerated vesting of stock-based compensation awards for certain employees terminated as a result of our restructuring activities.

15. INCOME TAXES

The components of pretax income (loss) from continuing operations for the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):

	Year Ended December 31,
	2018			2017		2016
United States	$	23,349		$	30,095	$	(119,095	)
International	(22,318		)	6,050		(52,432		)
Income (loss) before provision (benefit) for income taxes	$	1,031		$	36,145	$	(171,527	)

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The provision (benefit) for income taxes for the years ended December 31, 2018, 2017 and 2016 was allocated between continuing operations and discontinued operations as follows (in thousands):

	Year Ended December 31,
	2018			2017		2016
Continuing Operations	$	(957	)	$	7,544	$	(5,318	)
Discontinued Operations	—			—		2,771
Total	$	(957	)	$	7,544	$	(2,547	)

The provision (benefit) for income taxes from continuing operations for the years ended December 31, 2018, 2017 and 2016 consisted of the following components (in thousands):

	Year Ended December 31,
	2018			2017			2016
Current taxes:
U.S. federal	$	768		$	(120	)	$	(1,093	)
State	57			191			912
International	3,218			6,870			5,311
Total current taxes	4,043			6,941			5,130
Deferred taxes:
U.S. federal	(319		)	(1,335		)	(4,262		)
State	—			50			(11		)
International	(4,681		)	1,888			(6,175		)
Total deferred taxes	(5,000		)	603			(10,448		)
Provision (benefit) for income taxes	$	(957	)	$	7,544		$	(5,318	)

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The items accounting for differences between the income tax provision (benefit) from continuing operations computed at the U.S. federal statutory rate and the provision (benefit) for income taxes for the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):

	Year Ended December 31,
	2018			2017			2016
U.S. federal income tax provision (benefit) at statutory rate	$	216		$	12,651		$	(60,035	)
Foreign income and losses taxed at different rates (1)	2,113			4,524			9,410
State income taxes, net of federal benefits, and state tax credits	1,966			(4,980		)	(4,694		)
Change in valuation allowances	3,829			(36,057		)	13,797
Effect of income tax rate changes on deferred items (2)	1,544			20,466			7,135
Tax effects of intercompany transactions	607			3,332			853
Adjustments related to uncertain tax positions	18			1,824			(4,899		)
Non-deductible stock-based compensation expense	3,239			5,002			6,724
Tax shortfalls on stock-based compensation awards	(335		)	4,290			12,585
Non-deductible (or non-taxable) change in fair value of investment	—			—			4,484
Federal research and development credits	(8,331		)	(7,862		)	(8,547		)
Forgiveness of intercompany liabilities	(1,340		)	(2,494		)	15,187
Deductions for investments in subsidiaries that have ceased operations	—			—			(645		)
Ordinary stock loss	(11,815		)	—			—
Non-taxable gains on business dispositions	—			—			(3,481		)
Non-deductible or non-taxable items	7,332			6,848			6,808
Provision (benefit) for income taxes	$	(957	)	$	7,544		$	(5,318	)

(1) Tax rates in foreign jurisdictions were generally lower than the U.S. federal statutory rate through December 31, 2018. This results in an adverse impact to the provision (benefit) for income taxes in this rate reconciliation for the years ended December 31, 2018, 2017 and 2016, prior to the impact of valuation allowances, due to the net pretax losses from continuing operations in certain foreign jurisdictions with lower tax rates.

(2) The effect of income tax rate changes on deferred items for the year ended December 31, 2017 is primarily related to the U.S. tax reform legislation that was signed into law on December 22, 2017, which included a reduction of the U.S. Federal income tax rate to 21 percent. That rate reduction did not impact our provision for income taxes for the year ended December 31, 2017 due to the valuation allowance against our U.S. net deferred tax assets.

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The deferred income tax assets and liabilities consisted of the following components as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018			2017
Deferred tax assets:
Accrued expenses and other liabilities	$	25,694		$	36,786
Stock-based compensation	5,167			3,720
Net operating loss and tax credit carryforwards	206,328			208,040
Intangible assets, net	16,482			23,722
Investments	5,916			814
Unrealized foreign currency exchange losses	1,882			2,771
Other	1,021			687
Total deferred tax assets	262,490			276,540
Less: Valuation allowances	(228,023		)	(238,702		)
Deferred tax assets, net of valuation allowance	34,467			37,838
Deferred tax liabilities:
Prepaid expenses and other assets	(12,737		)	(10,011		)
Property, equipment and software, net	(12,576		)	(11,315		)
Convertible senior notes	(2,457		)	(2,773		)
Deferred revenue	(7,255		)	(10,436		)
Total deferred tax liabilities	(35,025		)	(34,535		)
Net deferred tax asset (liability)	$	(558	)	$	3,303

We have incurred significant losses in recent periods and had an accumulated deficit of $1,010.5 million as of December 31, 2018. As a result, we maintained valuation allowances against our domestic deferred tax assets and substantially all of our foreign deferred tax assets as of December 31, 2018 and 2017 to reduce their carrying values to amounts that are realizable either through future reversals of existing taxable temporary differences or through taxable income in carryback years for the applicable jurisdictions.

We had $233.1 million of federal and $1,057.5 million of state net operating loss carryforwards as of December 31, 2018, which will begin expiring in 2027 and 2019. As of December 31, 2018, we had $462.2 million of foreign net operating loss carryforwards, a significant portion of which carry forward for an indefinite period.

We are subject to taxation in the United States, state jurisdictions and foreign jurisdictions. Significant judgment is required in determining the worldwide provision for income taxes and recording the related income tax assets and liabilities. We recognize the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit. For tax positions meeting the more-likely-than-not criterion, the amount recognized in the financial statements is the largest benefit that has a greater than 50 percent likelihood of being realized upon ultimate settlement with the relevant tax authority.

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The following table summarizes activity related to our gross unrecognized tax benefits, excluding interest and penalties, for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017			2016
Beginning Balance	$	87,359		$	80,081		$	79,637
Increases related to prior year tax positions	1,500			960			1,708
Decreases related to prior year tax positions	(21		)	(1,196		)	(3,154		)
Increases related to current year tax positions	7,533			9,571			11,443
Decreases based on settlements with taxing authorities	—			—			(3,176		)
Decreases due to lapse of statute limitations	(9,447		)	(3,777		)	(4,906		)
Foreign currency translation	713			1,720			(1,471		)
Ending Balance	$	87,637		$	87,359		$	80,081

The total amount of unrecognized tax benefits as of December 31, 2018, 2017 and 2016 that, if recognized, would affect the effective tax rate are $33.3 million, $37.6 million and $34.5 million, respectively.

We recognized $1.6 million, $0.2 million and $1.2 million of interest and penalties within Provision (benefit) for income taxes on our consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016. Total accrued interest and penalties as of December 31, 2018, 2017 and 2016 were $5.4 million, $4.8 million and $4.6 million, and are included within Other non-current liabilities in our consolidated balance sheets.

We are currently under IRS audit for the 2013 and 2014 tax years. Additionally, we are currently under audit by several foreign jurisdictions. It is likely that the examination phase of some of those audits will conclude in the next 12 months. There are many factors, including factors outside of our control, which influence the progress and completion of those audits. We recognized income tax benefits of $7.9 million, $3.0 million and $8.4 million for the years ended December 31, 2018, 2017 and 2016, as a result of new information that impacted our estimates of the amounts that are more-likely-than not of being realized upon settlement of the related tax positions and due to expirations of the applicable statutes of limitations. We are subject to claims for tax assessments by foreign jurisdictions, including a proposed assessment for $109.6 million. We believe that the assessment, which primarily relates to transfer pricing on transactions occurring in 2011, is without merit and we intend to vigorously defend ourselves in that matter. In addition to any potential increases in our liabilities for uncertain tax positions from the ultimate resolution of that assessment, we believe that it is reasonably possible that reductions of up to $49.7 million in unrecognized tax benefits may occur within the 12 months following December 31, 2018 upon closing of income tax audits or the expiration of applicable statutes of limitations.

The Jobs Act was signed into law on December 22, 2017. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118 ("SAB 118") to address the application of U.S. GAAP to situations in which an entity does not have the necessary information available, prepared or analyzed in reasonable detail to complete the accounting for certain income tax effects of the Jobs Act. That guidance specifies that, for income tax effects of the Jobs Act that can be reasonably estimated but for which the accounting and measurement analysis is not yet complete, entities should report provisional amounts in the reporting period that includes the enactment date and those provisional amounts can be adjusted for a measurement period not to exceed one year from the enactment date. Additionally, for income tax effects of the Jobs Act that cannot be reasonably estimated, entities should report provisional amounts for those income tax effects in the first reporting period in which a reasonable estimate can be determined, not to exceed one year from the enactment date.

We previously made provisional estimates for the impact of the Jobs Act as of and for the year ended December 31, 2017 related to the re-measurement of deferred income taxes, valuation allowances, uncertain tax positions, and our assessment of permanently reinvested earnings. Additionally, while we did not expect to incur the deemed repatriation tax established by the Jobs Act due to the aggregate cumulative losses of our foreign operations, we had not previously finalized the related calculations. As of December 31, 2018, we have completed our accounting and measurement analyses related to the income tax effects of the Jobs Act and no significant adjustments to the provisional amounts were recorded during the year ended December 31, 2018.

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The Jobs Act also establishes global intangible low-taxed income ("GILTI") provisions that impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. Our accounting policy for the income tax effects of GILTI will be to recognize those taxes as expenses in the period incurred.

In general, it is our practice and intention to reinvest the earnings of our non-U.S. subsidiaries in those operations. Additionally, while we did not incur the deemed repatriation tax established by the Jobs Act, an actual repatriation from our non-U.S. subsidiaries could be subject to foreign and U.S. state income taxes. Aside from limited exceptions for which the related deferred tax liabilities recognized as of December 31, 2018 and 2017 are immaterial, we do not intend to distribute earnings of foreign subsidiaries for which we have an excess of the financial reporting basis over the tax basis of our investments and therefore have not recorded any deferred taxes related to such amounts. The actual tax cost resulting from a distribution would depend on income tax laws and circumstances at the time of distribution. Determination of the amount of unrecognized deferred tax liability related to the excess of the financial reporting basis over the tax basis of our foreign subsidiaries is not practical due to the complexities associated with the calculation.

On July 24, 2018, the Ninth Circuit Court of Appeals issued an opinion in Altera Corp. v. Commissioner requiring related parties in an intercompany cost-sharing arrangement to share expenses related to stock-based compensation. This opinion reversed an earlier decision of the United States Tax Court. On August 7, 2018, the Ninth Circuit Court of Appeals withdrew its July 24, 2018 opinion. We are continuing to monitor the status of the case; however, we currently do not expect that it will have a material impact on our provision for income taxes for the year ending December 31, 2019 due to the valuation allowances against our net deferred tax assets in the related jurisdictions. 

16. VARIABLE INTEREST ENTITY

Variable interest entities ("VIEs") are entities that have either a total equity investment that is insufficient to permit the entity to finance its activities without additional subordinated financial support, or whose equity investors lack the characteristics of a controlling financial interest (i.e., the ability to make significant decisions through voting rights and the right to receive the expected residual returns of the entity or the obligation to absorb the expected losses of the entity). A variable interest holder that has both (a) the power to direct the activities of the VIE that most significantly impact its economic performance and (b) either an obligation to absorb losses or a right to receive benefits that could potentially be significant to the VIE is referred to as the primary beneficiary and must consolidate the VIE.

In 2011, we entered into an arrangement with a strategic partner to offer deals related to live events, and a limited liability company ("LLC") was established to administer that arrangement. Groupon and the strategic partner each own 50% of the outstanding LLC interests and income and cash flows of the LLC are allocated based on agreed upon percentages specified in the related LLC agreement.

Our obligations associated with our interests in the LLC are primarily administering transactions, contributing intellectual property, identifying deals and promoting the sale of deal offerings, coordinating the distribution of deal offerings and providing the record keeping.

Under the LLC agreement, as amended, the LLC shall be dissolved upon the occurrence of any of the following events: (1) either party becoming a majority owner; (2) July 11, 2019; (3) certain elections of Groupon or the strategic partner based on the operational performance of the LLC or other changes to certain terms in the agreement; (4) election of either Groupon or the strategic partner in the event of bankruptcy by the other party; (5) sale of the LLC; or (6) a court's dissolution of the LLC. We intend to negotiate an extension to this agreement.

We have determined that the LLC is a VIE and that we are its primary beneficiary. We consolidate the LLC because we have the power to direct the activities of the LLC that most significantly impact the LLC's economic performance. In particular, we identify and promote the deal offerings, provide all of the operational and back office support, present the LLC's deal offerings via our websites and mobile applications and provide the editorial resources that create the verbiage for the related deal offers.

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17. FAIR VALUE MEASUREMENTS

Fair value is defined under U.S. GAAP as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is a market-based measurement that is determined based on assumptions that market participants would use in pricing an asset or a liability.

To increase the comparability of fair value measures, the following hierarchy prioritizes the inputs in valuation methodologies used to measure fair value:

Level 1 - Measurements that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.

Level 2 - Measurements that include other inputs that are directly or indirectly observable in the marketplace.

Level 3 - Measurements derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. These fair value measurements require significant judgment.

In determining fair value, we use various valuation approaches within the fair value measurement framework. The valuation methodologies used for our assets and liabilities measured at fair value and their classification in the valuation hierarchy are summarized below:

Cash equivalents. Cash equivalents primarily consisted of AAA-rated money market funds. We classified cash equivalents as Level 1 due to the short-term nature of these instruments and measured the fair value based on quoted prices in active markets for identical assets.

Fair value option investments and available-for-sale securities. To determine the fair value of our fair value option investments each period, we first estimate the fair value of each entity in its entirety. We primarily use the discounted cash flow method, which is an income approach, to estimate the fair value of the investees. The key inputs to determining fair values under that approach are cash flow forecasts and discount rates. As of December 31, 2018 and 2017, we applied discount rates of 21% and 22%, in our discounted cash flow valuations for Monster LP. We also use a market approach valuation technique, which is based on market multiples of guideline companies, to determine the fair value of each entity. The discounted cash flow and market multiple valuations are then evaluated and weighted to determine the amount that is most representative of the fair value of each entity. Once we determine the fair value of each entity, we then determine the fair value of our specific investments in those entities. The entities have complex capital structures, so we apply an option-pricing model that considers the liquidation preferences of each investee’s respective classes of ownership interests to determine the fair value of our investment in each entity.

We also have investments in redeemable preferred shares and had investments in convertible debt securities issued by nonpublic entities. We measure the fair value of those available-for-sale securities using the discounted cash flow method.

We have classified our fair value option investments and our investments in available-for-sale securities as Level 3 due to the lack of observable market data over fair value inputs such as cash flow projections and discount rates. Increases in projected cash flows and decreases in discount rates contribute to increases in the estimated fair values of the fair value option investments and available-for-sale securities, whereas decreases in projected cash flows and increases in discount rates contribute to decreases in their fair values.

Contingent consideration. We are subject to a contingent consideration arrangement to transfer a maximum payout in cash of $2.5 million to the former owners of a business acquired on April 30, 2018. See Note 4, Business Combinations, for further discussion of that acquisition. Additionally, we had contingent obligations in prior periods to transfer cash to the former owners of a previous business acquisition if specified financial results were met (i.e. an earnout).

Liabilities for contingent consideration are measured at fair value each reporting period, with the acquisition-date fair value included as part of the consideration transferred in the related business combination and

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subsequent changes in fair value recorded in earnings within Selling, general and administrative expense on the consolidated statements of operations.

We use an income approach to value contingent consideration obligations based on the present value of probability-weighted future cash flows. We classify the contingent consideration liabilities as Level 3 due to the lack of relevant observable market data over fair value inputs such as probability-weighting of payment outcomes.

The following tables summarize assets that are measured at fair value on a recurring basis as of December 31, 2018 and 2017 (in thousands):

			Fair Value Measurement at Reporting Date Using
	December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Fair value option investments	$	73,902	$	—	$	—	$	73,902
Available-for-sale securities:
Redeemable preferred shares	10,340		—		—		10,340
Liabilities:
Contingent consideration	1,529		—		—		1,529

			Fair Value Measurement at Reporting Date Using
	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents	$	137,975	$	137,975	$	—	$	—
Fair value option investments	82,966		—		—		82,966
Available-for-sale securities:
Convertible debt securities	11,354		—		—		11,354
Redeemable preferred shares	15,431		—		—		15,431

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The following table provides a roll-forward of the fair value of recurring Level 3 fair value measurements for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017			2016
Assets
Fair value option investments:
Beginning Balance	$	82,966		$	82,584		$	130,725
Total gains (losses) included in earnings	(9,064		)	382			(48,141		)
Ending Balance	$	73,902		$	82,966		$	82,584
Unrealized (losses) gains still held (1)	$	(9,064	)	$	382		$	(48,141	)
Available-for-sale securities
Convertible debt securities:
Beginning Balance	$	11,354		$	10,038		$	10,116
Purchases and acquisition of convertible debt securities	—			1,612			—
Proceeds from sales and maturities of convertible debt securities	(8,594		)	(1,843		)	(1,685		)
Transfer to other equity method investment upon conversion of convertible debt security	(4,008		)	—			—
Total gains (losses) included in other comprehensive income (loss)	(1,148		)	(437		)	703
Total gains (losses) included in earnings(2)	2,396			1,984			904
Ending Balance	$	—		$	11,354		$	10,038
Unrealized gains (losses) still held (1)	$	—		$	1,303		$	1,607
Redeemable preferred shares:
Beginning Balance	$	15,431		$	17,444		$	22,834
Total gains (losses) included in other comprehensive income (loss)	379			931			(816		)
Other-than-temporary impairment included in earnings	(5,470		)	(2,944		)	—
Transfer to cost method investment classification upon elimination of redemption feature	—			—			(4,574		)
Ending Balance	$	10,340		$	15,431		$	17,444
Unrealized gains (losses) still held (1)	$	(5,091	)	$	(2,013	)	$	(816	)
Liabilities
Contingent Consideration:
Beginning Balance	$	—		$	14,588		$	10,781
Issuance of contingent consideration in connection with acquisitions	1,589			—			—
Settlements of contingent consideration liabilities	—			(7,858		)	—
Reclass to non-fair value liabilities when no longer contingent	—			(6,778		)	(285		)
Total losses (gains) included in earnings	56			48			4,092
Foreign currency translation	(116		)	—			—
Ending Balance	$	1,529		$	—		$	14,588
Unrealized losses (gains) still held (1)	$	56		$	—		$	3,966

(1) Represents the unrealized gains or losses recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.

(2) Represents a gain at maturity of a previously impaired convertible debt security, accretion of interest income and changes in the fair value of an embedded derivative.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

Certain assets and liabilities are measured at fair value on a nonrecurring basis, including assets that are written down to fair value as a result of an impairment. For the year ended December 31, 2018, we recorded a $4.6 million impairment of an other equity investment. To determine the fair value of the investment, we considered the financial condition of the investee and applied a market approach. We have classified the fair value measurement of that other equity investment as Level 3 because it involves significant unobservable inputs. For the year ended December 31, 2016, we recorded a $0.3 million impairment charge related to property, equipment and software as a

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result of our restructuring activities (refer to Note 14, Restructuring). Those long lived assets were written down to their estimated fair values of zero as of December 31, 2016.

Estimated Fair Value of Financial Assets and Liabilities Not Measured at Fair Value

The following table presents the carrying amount and fair value of equity securities that were classified as cost method investments as of December 31, 2017 (in thousands):

	December 31, 2017
	Carrying Amount		Fair Value
Cost method investments (1)	$	25,438	$	32,792

(1) See Note 2, Summary of Significant Accounting Policies, and Note 7, Investments, for information about our adoption of ASU 2016-01 on January 1, 2018 and its impact on accounting for equity investments without readily determinable fair values that were previously subject to the cost method of accounting.

The fair values of our cost method investments were determined using the market approach or the income approach, depending on the availability of fair value inputs such as financial projections for the investees and market multiples for comparable companies. We classified the fair value measurements of our cost method investments as Level 3 measurements within the fair value hierarchy as of December 31, 2017 because they involve significant unobservable inputs such as cash flow projections and discount rates.

Our other financial instruments not carried at fair value consist primarily of accounts receivable, restricted cash, accounts payable, accrued merchant and supplier payables and accrued expenses. The carrying values of those assets and liabilities approximate their respective fair values as of December 31, 2018 and 2017 due to their short-term nature.

18. INCOME (LOSS) PER SHARE

Basic net income (loss) per share is computed using the weighted-average number of common shares outstanding during the period. Diluted net income (loss) per share is computed using the weighted-average number of common shares and the effect of potentially dilutive securities outstanding during the period. Potentially dilutive securities include stock options, restricted stock units, performance share units, performance bonus awards, ESPP shares, warrants and convertible senior notes. If dilutive, those potentially dilutive securities are reflected in diluted net income (loss) per share by application of the treasury stock method, except for the convertible senior notes, which are subject to the if-converted method.

Each share of our Class A and Class B common stock automatically converted into a single class of common stock on October 31, 2016. Refer to Note 11, Stockholders' Equity, for additional information. Prior to the conversion, we computed net income (loss) per share of Class A and Class B common stock using the two class method. Under the two-class method, the undistributed earnings for each period were allocated based on the contractual participation rights of the Class A and Class B common shares as if the earnings for the period had been distributed. As the liquidation and dividend rights were identical for Class A and Class B common shares, the undistributed earnings were allocated on a proportionate basis. Under the two-class method, the computation of diluted net income (loss) per share of Class A common stock would reflect the conversion of Class B common stock, if dilutive, while the computation of diluted net income (loss) per share of Class B common stock would not reflect the conversion of those shares.

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The following table sets forth the computation of basic and diluted net income (loss) per share of common stock for the years ended December 31, 2018 and 2017 (in thousands, except share amounts and per share amounts):

	Year Ended December 31,
	2018			2017
Basic and diluted net income (loss) per share:
Numerator
Net income (loss) - continuing operations	$	1,988		$	28,601
Less: Net income (loss) attributable to noncontrolling interests	13,067			12,587
Net income (loss) attributable to common stockholders - continuing operations	$	(11,079	)	$	16,014
Net income (loss) attributable to common stockholders - discontinued operations	—			(1,974		)
Net income (loss) attributable to common stockholders	$	(11,079	)	$	14,040
Denominator
Shares used in computation of basic net income (loss) per share	566,511,108			559,367,075
Weighted-average effect of diluted securities:
Stock Options	—			842,047
Restricted Stock	—			488,773
Restricted Stock Units	—			7,153,674
Employee Stock Purchase Plan	—			201,504
Performance Share Units and Performance Bonus Awards	—			365,298
Shares used in computation of diluted net income (loss) per share	566,511,108			568,418,371
Basic net income (loss) per share:
Continuing operations	$	(0.02	)	$	0.03
Discontinued operations	0.00			(0.00		)
Basic net income (loss) per share	$	(0.02	)	$	0.03
Diluted net income (loss) per share:
Continuing operations	$	(0.02	)	$	0.03
Discontinued operations	0.00			(0.01		)
Diluted net income (loss) per share	$	(0.02	)	$	0.02

The following table sets forth the computation of basic and diluted loss per share of the common stock and the Class A and Class B common stock for the year ended December 31, 2016 (in thousands, except share amounts and per share amounts):

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	Period from January 1, 2016 through October 31, 2016 (pre-conversion)						Period from November 1, 2016 through December 31, 2016 (post-conversion)			Year Ended December 31, 2016 (2)
	Class A			Class B			Common			Total
Basic and diluted net income (loss) per share:
Numerator
Allocation of net income (loss) - continuing operations	$	(151,284	)	$	(632	)	$	(14,293	)	$	(166,209	)
Less: Allocation of net income (loss) attributable to noncontrolling interests	9,559			40			1,665			11,264
Allocation of net income (loss) attributable to common stockholders - continuing operations	$	(160,843	)	$	(672	)	$	(15,958	)	$	(177,473	)
Allocation of net income (loss) attributable to common stockholders - discontinued operations	(7,152		)	(30		)	(9,932		)	(17,114		)
Allocation of net income (loss) attributable to common stockholders	$	(167,995	)	$	(702	)	$	(25,890	)	$	(194,587	)
Denominator
Weighted-average common shares outstanding	574,755,214			2,399,976			574,884,987			576,354,258
Basic and diluted net income (loss) per share (1):
Continuing operations	$	(0.28	)	$	(0.28	)	$	(0.03	)	$	(0.31	)
Discontinued operations	(0.01		)	(0.01		)	(0.02		)	(0.03		)
Basic and diluted net income (loss) per share	$	(0.29	)	$	(0.29	)	$	(0.05	)	$	(0.34	)

(1) The potentially dilutive impacts of a conversion of Class B to Class A shares, outstanding equity awards, warrants and convertible senior notes have been excluded from the calculation of dilutive net income (loss) per share for the years ended December 31, 2016 as their effect on net income (loss) per share from continuing operations was antidilutive.

(2) The shares of Class A and Class B common stock had equal dividend rights and converted into shares of common stock on a one-for-one basis on October 31, 2016. This full year column reflects the weighted average Class A and Class B common shares outstanding for the period from January 1, 2016 through the October 31, 2016 conversion date and the weighted average common shares outstanding for the period from November 1, 2016 through December 31, 2016 in the denominator of the basic and diluted loss per share calculations for the year ended December 31, 2016.

The following weighted-average potentially dilutive instruments are not included in the diluted net income (loss) per share calculations above because they would have had an antidilutive effect on the net income (loss) per share from continuing operations:

	Year Ended December 31,
	2018	2017	2016
Restricted stock units	30,552,028	8,087,545	33,480,458
Other stock-based compensation awards	2,041,099	13,000	3,850,389
Convertible senior notes	46,296,300	46,296,300	34,213,474
Warrants	46,296,300	46,296,300	29,761,907
Total	125,185,727	100,693,145	101,306,228

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19. SEGMENT INFORMATION

The segment information reported in the tables below reflects the operating results that are regularly reviewed by our chief operating decision maker to assess performance and make resource allocation decisions. Prior to the first quarter 2017, we organized our operations into three operating segments: North America, EMEA and Rest of World. As a result of the dispositions discussed in Note 3, Discontinued Operations and Other Business Dispositions, which represented a substantial majority of our international operations outside of EMEA and resulted in changes to our internal reporting and leadership structure, we updated our segments in the first quarter of 2017 to report two operating segments: North America and International. Our operating segments continue to be the same as our reportable segments. In addition, we changed our measure of segment profitability in the first quarter of 2017. Historically, segment operating results reflected operating income (loss) excluding stock-based compensation and acquisition-related expense (benefit), net. In connection with the internal reporting changes in the first quarter of 2017, the measure of segment profitability has been changed to operating income (loss), unadjusted. Prior period segment information has been retrospectively adjusted to reflect those changes.

The following table summarizes revenue by reportable segment and category for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
North America
Service revenue:
Local	$	752,863	$	825,579	$	762,314
Travel	71,856		78,495		82,577
Goods	18,283		16,768		9,068
Product revenue - Goods	796,393		993,326		1,297,810
Total North America revenue (1)	1,639,395		1,914,168		2,151,769
International
Service revenue:
Local	306,700		281,466		270,045
Travel	41,183		43,786		49,756
Goods	14,602		20,358		32,681
Product revenue - Goods	634,866		584,099		509,364
Total International revenue (1)	$	997,351	$	929,709	$	861,846

(1) North America includes revenue from the United States of $1,600.2 million, $1,884.7 million and $2,120.3 million for the years ended December 31, 2018, 2017 and 2016. International includes revenue from the United Kingdom of $390.4 million, $343.9 million and $321.9 million for the years ended December 31, 2018,2017 and 2016. There were no other individual countries that represented more than 10% of consolidated total revenue for the years ended December 31, 2018, 2017 and 2016. Revenue is attributed to individual countries based on the location of the customer. In prior periods, revenue was attributed to individual countries based on the domicile of the legal entities within our consolidated group that undertook those transactions. Beginning in the second quarter of 2017, we updated our attribution of revenue by country to be based on the location of the customer. Prior period revenue amounts by country have been retrospectively adjusted to reflect that change in attribution.

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The following table summarizes gross profit by reportable segment and category for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
North America
Service gross profit:
Local	$	671,352	$	708,573	$	660,983
Travel	57,945		60,594		64,355
Goods	15,302		12,929		7,470
Product gross profit - Goods	146,085		145,582		152,739
Total North America gross profit	890,684		927,678		885,547
International
Service gross profit:
Local	289,427		265,348		250,435
Travel	38,132		40,288		45,191
Goods	13,252		17,910		27,976
Product gross profit - Goods	89,106		82,637		71,504
Total International gross profit	$	429,917	$	406,183	$	395,106

The following table summarizes operating income by reportable segment for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017			2016
Operating income (loss) (1) (2) (3) (4) :
North America	$	19,909	$	(45	)	$	(85,423	)
International	34,130		29,480			(14,815		)
Total operating income (loss)	$	54,039	$	29,435		$	(100,238	)

(1) Includes stock-based compensation of $59.7 million, $76.1 million and $104.7 million for North America and $5.0 million, $5.7 million and $9.5 million for International for the years ended December 31, 2018, 2017 and 2016, respectively.

(2) Includes acquisition-related (benefit) expense, net of $0.7 million for International for the year ended December 31, 2018 and $5.7 million for North America for the year ended December 31, 2016.

(3) Includes restructuring charges for North America and International. See Note 14, Restructuring, for restructuring charges by segment.

(4) Includes a $34.6 million charge related to the IBM patent litigation matter for North America for the year ended December 31, 2018. See Note 10, Commitments and Contingencies, for additional information.

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The following table summarizes total assets by reportable segment as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Total assets:
North America (1)	$	958,412	$	1,045,072
International (1)	683,730		632,433
Consolidated total assets	$	1,642,142	$	1,677,505

(1) North America contains assets from the United States of $940.5 million and $1,006.2 million as of December 31, 2018 and 2017. International contains assets from Ireland of $204.6 million and $219.7 million as of December 31, 2018 and 2017. There were no other individual countries that represented more than 10% of consolidated total assets as of December 31, 2018 and 2017.

The following table summarizes tangible property and equipment, net of accumulated depreciation and amortization, by reportable segment as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
North America (1)	$	51,032	$	63,402
International (2)	20,773		21,850
Consolidated total	$	71,805	$	85,252

(1) Substantially all tangible property and equipment within North America is located in the United States.

(2) Tangible property and equipment, net located within Ireland represented approximately 12% of our consolidated tangible property and equipment, net as of December 31, 2017. There were no other individual countries located outside of the United States that represented more than 10% of consolidated tangible property and equipment, net as of December 31, 2018 and 2017.

The following table summarizes depreciation and amortization of property, equipment and software and intangible assets by reportable segment for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
North America	$	101,419	$	121,616	$	116,865
International	14,409		16,211		19,044
Consolidated total	$	115,828	$	137,827	$	135,909

The following table summarizes expenditures for additions to tangible long-lived assets by reportable segment for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
North America	$	6,194	$	5,917	$	9,770
International	10,393		5,106		5,255
Consolidated total	$	16,587	$	11,023	$	15,025

20. RELATED PARTY TRANSACTION

On December 28, 2016, we entered into a sublease for portions of our office space in Chicago, Illinois to Uptake, Inc. ("Uptake"), a Lightbank LLC ("Lightbank") portfolio company. Eric Lefkofsky, our Chairman of the Board, is a co-founder and owns a significant equity interest in Lightbank. The sublease was negotiated on an arm’s-length basis and is a market rate transaction on terms that we believe are no less favorable than would have been reached with an unrelated third party. The sublease extends through January 31, 2026 and the sublease rentals over that term total approximately $18.2 million. Pursuant to our related party transaction policy, our Audit Committee approved us entering

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into the sublease. For the years ended December 31, 2018 and 2017, we recognized $2.1 million and $1.9 million, in income from the sublease.

21. QUARTERLY RESULTS (UNAUDITED)

The following table represents data from our unaudited consolidated statements of operations for the most recent eight quarters. This quarterly information has been prepared on the same basis as the consolidated financial statements and includes all normal recurring adjustments necessary to fairly state the information for the periods presented. The results of operations of any quarter are not necessarily indicative of the results that may be expected for any future period (in thousands, except share and per share amounts).

	Quarter Ended
	Dec. 31,		Sept. 30,		June 30,			Mar. 31,			Dec. 31,			Sept. 30,			June 30,			Mar. 31,
	2018		2018 (2)		2018 (2)			2018			2017			2017			2017			2017
Consolidated Statements of Operations Data:
Revenue	$	799,927	$	592,883	$	617,396		$	626,540		$	873,166		$	634,466		$	662,619		$	673,626
Cost of revenue	433,858		286,894		293,738			301,655			486,248			325,041			334,552			364,175
Gross profit	366,069		305,989		323,658			324,885			386,918			309,425			328,067			309,451
Income (loss) from operations	61,876		53,023		(64,245		)	3,385			49,726			(1,213		)	(7,398		)	(11,680		)
Income (loss) from continuing operations (1)	49,862		47,175		(92,254		)	(2,795		)	51,071			3,802			(5,403		)	(20,869		)
Income (loss) from discontinued operations, net of tax	—		—		—			—			(223		)	(862		)	(1,376		)	487
Net income (loss) attributable to Groupon, Inc.	46,228		44,615		(95,034		)	(6,888		)	47,721			59			(9,326		)	(24,414		)
Basic net income (loss) per share (3) :
Continuing operations	$	0.08	$	0.08	$	(0.17	)	$	(0.01	)	$	0.09		$	0.00		$	(0.01	)	$	(0.04	)
Discontinued operations	0.00		0.00		0.00			0.00			(0.00		)	(0.00		)	(0.01		)	0.00
Basic net income (loss) per share	$	0.08	$	0.08	$	(0.17	)	$	(0.01	)	$	0.09		$	0.00		$	(0.02	)	$	(0.04	)
Diluted net income (loss) per share (3):
Continuing operations	$	0.08	$	0.08	$	(0.17	)	$	(0.01	)	$	0.08		$	0.00		$	(0.01	)	$	(0.04	)
Discontinued operations	0.00		0.00		0.00			0.00			(0.00		)	(0.00		)	(0.01		)	0.00
Diluted net income (loss) per share	$	0.08	$	0.08	$	(0.17	)	$	(0.01	)	$	0.08		$	0.00		$	(0.02	)	$	(0.04	)

(1) Income (loss) from continuing operations includes restructuring charges of $11.5 million, $4.6 million and $2.7 million for the three months ended September 30, 2017, June 30, 2017 and March 31, 2017. Restructuring charges were not material for any quarterly period during the year ended December 31, 2018 or for the three months ended December 31, 2017.

(2) Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

(3) The sum of per share amounts for quarterly periods may not equal year-to-date amounts due to rounding.

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ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and our Chief Financial Officer, has evaluated the effectiveness of the design and operation of our disclosure controls and procedures pursuant to Rule 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the Exchange Act), as of the end of the period covered by this Annual Report on Form 10-K.

Based on this evaluation, our management concluded that, as of December 31, 2018, our disclosure controls and procedures are effective to provide reasonable assurance that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

Management’s Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as defined in Rule 13a-15(f) of the Exchange Act. Our management conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework). Our internal control over financial reporting includes policies and procedures that provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external reporting purposes in accordance with U.S. generally accepted accounting principles. Based on this evaluation, management concluded that our internal control over financial reporting was effective as of December 31, 2018. Management reviewed the results of its assessment with our Audit Committee. The effectiveness of our internal control over financial reporting as of December 31, 2018 has been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in its report which is included below.

Changes in Internal Control over Financial Reporting

There was no change in our internal control over financial reporting identified in connection with the evaluation required by Rule 13a-15(d) and 15d-15(d) of the Exchange Act that occurred during the quarter ended December 31, 2018 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Limitations on Effectiveness of Controls and Procedures

In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. In addition, the design of disclosure controls and procedures must reflect the fact that there are resource constraints and that management is required to apply its judgment in evaluating the benefits of possible controls and procedures relative to their costs.

136

Report of Independent Registered Public Accounting Firm

To the stockholders and the Board of Directors of Groupon, Inc.

Opinion on Internal Control over Financial Reporting

We have audited the internal control over financial reporting of Groupon, Inc. and subsidiaries (the “Company”) as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework (2013) issued by COSO.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements as of and for the year ended December 31, 2018, of the Company and our report dated February 12, 2019, expressed an unqualified opinion on those financial statements.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ Deloitte & Touche LLP

Chicago, Illinois  

February 12, 2019  

137

ITEM 9B. OTHER INFORMATION

On February 9, 2019, the Compensation Committee (the “Compensation Committee”) of the Board of Directors in connection with its annual compensation review process approved a change in the allocation between base salary and target bonus of each named executive officer’s compensation. Specifically, the Compensation Committee approved an increase in the 2019 annual base salary of each named executive officer and a corresponding reduction of the same amount in each executive’s 2019 target annual incentive amount, so that each executive’s 2019 total target cash compensation remains the same as in 2018. The resulting 2019 base salary and target annual incentive amounts for the named executive officers are as follows:

Name and Position	2019 Base Salary	2019 Target Bonus
Rich Williams, Chief Executive Officer	$850,000	$650,000
Michael Randolfi, Chief Financial Officer	$600,000	$400,000
Stephen Krenzer, Chief Operating Officer	$725,000	$525,000
Dane Drobny, General Counsel and Corporate Secretary	$550,000	$350,000

On February 12, 2019, in addition to the regular annual equity awards of restricted stock units and performance stock units consistent with prior practice, we granted to each named executive officer a special retention award of performance stock units (“Supplemental PSUs”) that will vest if our average daily closing stock price is equal to or greater than a specified stock price over a period of 30consecutive trading days prior to December 31, 2022, as follows (with number of Supplemental PSUs indicated per executive): Mr. Williams, 3,000,000; Mr. Randolfi, 1,000,000; Mr. Krenzer, 1,333,333; and Mr. Drobny, 666,667. The Supplemental PSUs will also vest if a change in control occurs during the performance period at the specified stock price (and on a proportional basis for a change in control price between the grant date price and the specified stock price) or if the executive’s employment is terminated without cause or by the executive for good reason (as defined in the executive’s severance benefit agreement) within 120days prior to vesting, subject to certain other limitations.

In addition, as part of our review of the terms of our severance benefits agreements, on February 9, 2019, the Compensation Committee authorized amendments to the severance benefit agreements with the named executive officers to extend the change in control protection period for certain terminations of employment (which would trigger change in control severance benefits) from 12 months following a change in control to 24 months following a change in control.

138

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Information regarding our Directors is incorporated by reference from the information under the captions "Board of Directors" and "Corporate Governance at Groupon" in our Proxy Statement for our 2019 Annual Meeting of Stockholders, which will be filed with the SEC within 120 days of December 31, 2018 ("2019 Proxy Statement"). Information regarding our Audit Committee and its Financial Experts is incorporated by reference from the information under the captions "Board Committees" and "Audit Committee Report" in our 2019 Proxy Statement. Information regarding our Executive Officers can be found in Part I of this Annual Report on Form 10-K. Information regarding compliance with Section 16(a) of the Exchange Act is incorporated by reference from the information under the caption "Section 16(a) Beneficial Ownership Reporting Compliance" in our 2019 Proxy Statement.

Code of Ethics

We have adopted a Code of Conduct, which is applicable to our chief executive officer, chief financial officer and other principal executive and senior financial officers. Our Code of Conduct is available through our website (www.groupon.com). Information about the Code of Conduct is incorporated by reference from the information under the caption "Corporate Governance at Groupon" in our 2019 Proxy Statement. We will post any amendment to or waiver from the provisions of the Code of Conduct that applies to the above executive officers on our investor relations website (investor.groupon.com) under the caption "Corporate Governance."

ITEM 11. EXECUTIVE COMPENSATION

Incorporated by reference from the information under the captions "Named Executive Officer Compensation," "Director Compensation," "Compensation Discussion and Analysis," "Compensation Committee Interlocks and Insider Participation" and "Compensation Committee Report" in our 2019 Proxy Statement.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

Incorporated by reference from the information under the captions "Information Regarding Beneficial Ownership of Principal Stockholders, Directors and Management" and "Equity Compensation Plan Information" in our 2019 Proxy Statement.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

Incorporated by reference from the information under the captions "Corporate Governance at Groupon," "Board Independence and Expertise" and "Certain Relationships and Related Party Transactions" in our 2019 Proxy Statement.

ITEM 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES

Incorporated by reference from the information under the caption "Independent Registered Public Accounting Firm" in our 2019 Proxy Statement.

139

PART IV

ITEM 15: EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(1) We have filed the following documents as part of the Annual Report on Form 10-K

Groupon, Inc.

Consolidated Financial Statements

As of December 31, 2018 and 2017 and for the Years Ended December 31, 2018, 2017 and 2016

(2) Financial Statement Schedules - Groupon, Inc.

Schedule II-Valuation and Qualifying Accounts

	Balance at Beginning of Year	Charged to Expense(1)	Acquisitions and Other		Balance at End of Year
	(in thousands)
TAX VALUATION ALLOWANCE:
Year ended December 31, 2018	238,702	3,829	(14,508	)	228,023
Year ended December 31, 2017	220,611	10,476	7,615		238,702
Year ended December 31, 2016	205,152	13,797	1,662		220,611

(1) The amount charged to expense related to the income tax valuation allowance for the year ended December 31, 2017 reflects a $46.5 million expense from discontinued operations, partially offset by a $36.1 million benefit from continuing operations. The $46.5 million discontinued operations expense reflects the valuation allowance recognized against loss carryforwards relating to tax losses on the stock of subsidiaries that were divested in 2017.

All other schedules have been omitted because they are either inapplicable or the required information has been provided in the consolidated financial statements or in the notes thereto.

(3) Exhibits

140

Exhibit Number	Description
2.1	Investment Agreement, dated as of April 19, 2015, among Groupon Trailblazer, Inc., Monster Partners LP and Monster Holdings LP (incorporated by reference to the Company's Current Report on Form 8-K filed April 20, 2015).
3.1	Restated Certificate of Incorporation of the Company (incorporated by reference to the Company's Registration Statement on Form 8-A/A filed on October 31, 2016).
3.2*	Amended and Restated By-Laws.
3.3	Amendment to the Amended and Restated By-Laws of the Company, dated as of June 10, 2016 (incorporated by reference to the Company’s Current Report on Form 8-K filed on June 14, 2016).
4.1	Specimen Stock Certificate of Common Stock (incorporated by reference to the Company's Registration Statement on Form 8-A/A filed on October 31, 2016).
4.2	Indenture, dated as of April 4, 2016, between the Company and U.S. Bank, National Association, as trustee (incorporated by reference to the Company’s Current Report on Form 8-K filed on April 4, 2016).
10.1*	2008 Stock Option Plan.**
10.2*	Form of Notice of Grant of Stock Option under 2008 Stock Option Plan.**
10.3*	2010 Stock Plan.**
10.4*	Form of Notice of Grant of Stock Option under 2010 Stock Plan.**
10.5*	Form of Notice of Restricted Stock Unit Award under 2010 Stock Plan.**
10.6*	Form of Indemnification Agreement.**
10.7	Form of Severance Benefit Agreement as entered into between Groupon, Inc. and its executive officers (incorporated by reference to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2017).**
10.8	2011 Incentive Plan, as amended and restated effective as of October 31, 2016 (incorporated by reference to the Company's Current Report on Form 8-K filed on October 31, 2016).**
10.9	Non-Employee Directors’ Compensation Plan **
10.10	Form of Notice of Restricted Stock Award under 2011 Incentive Plan (incorporated by reference to the Company's Annual Report on Form 10-K for the year ended December 31, 2012).**
10.11	Form of Notice of Performance Share Unit Award and Form of Performance Share Unit Award Agreement under 2011 Incentive Plan (incorporated by reference to the Company's Annual Report on Form 10-K for the year ended December 31, 2015).
10.12	Form of Notice of Performance Share Unit Award and Form of performance Share Unit Award Agreement under 2011 Incentive Plan (incorporate by reference to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2018)
10.13	Investment Agreement, dated as of April 3, 2016, between the Company and A-G Holdings, L.P. (incorporated by reference to the Company’s Current Report on Form 8-K filed on April 4, 2016).
10.14	Voting Agreement, dated as of April 4, 2016, among the Company, A-G Holdings, L.P. and the stockholders party thereto (incorporated by reference to the Company’s Current Report on Form 8-K filed on April 4, 2016).
10.15	Amendment No. 1 to Voting Agreement, dated as of February 13, 2018, by and among Eric Lefkofsky, Green Media, LLC, Bradley Keywell, Rugger Ventures LLC, A-G Holdings, L.P., and Groupon, Inc. (incorporated by reference to the Company’s Annual Report on Form 10-K filed on February 14, 2018)
10.16	Form of Note Hedge Confirmation, dated as of May 9, 2016, between the Company and each of the counterparties thereto (incorporated by reference to the Company’s Current Report on Form 8-K filed on May 9, 2016).
10.17	Form of Warrant Confirmation, dated as of May 9, 2016, between the Company and each of the counterparties thereto (incorporated by reference to the Company’s Current Report on Form 8-K filed on May 9, 2016).
10.18	Amended and Restated Credit Agreement, dated as of June 29, 2016, among the Company, JPMorgan Chase Bank, N.A., as Administrative Agent, and the lenders party thereto (incorporated by reference to the Company’s Current Report on Form 8-K filed on July 1, 2016).
21.1	Subsidiaries of Groupon, Inc.
23.1	Consent of Deloitte & Touche LLP
23.2	Consent of Ernst & Young LLP
31.1	Certification of Chief Executive Officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	Certification of Chief Financial Officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1	Certifications of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document

141

101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

_____________________________________

*    Incorporated by reference to the Company's registration statement on Form S-1 (registration number 333-174661)

**    Management contract or compensatory plan or arrangement.

142

Item 16. Form 10-K Summary (optional)

None.

143

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized on this 12th day of February 2019.

GROUPON, INC.
By:	/s/ RICH WILLIAMS
	Name:	Rich Williams
	Title:	Chief Executive Officer

POWER OF ATTORNEY

KNOWN BY ALL PERSONS BY THESE PRESENTS, that the individuals whose signatures appear below hereby constitute and appoint Rich Williams, Michael Randolfi and Melissa Thomas, and each of them severally, as his or her true and lawful attorneys-in-fact and agents with full power of substitution and resubstitution for him or her and in his or her name, place and stead in any and all capacities to sign any and all amendments to this Annual Report on Form 10-K and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, full power and authority to do or perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents or any of them, or of his substitute or substitutes, may lawfully do to cause to be done by virtue hereof. Pursuant to the requirements of the Securities Exchange Act of 1934, this Report has been signed below by the following persons on behalf of the registrant and in the capacities indicated as of February 12, 2019.

144

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized on this 12th day of February 2019.

Signature	Title
/s/ Rich Williams	Chief Executive Officer and Director (Principal Executive Officer)
Rich Williams
/s/ Michael Randolfi	Chief Financial Officer (Principal Financial Officer)
Michael Randolfi
/s/ Melissa Thomas	Chief Accounting Officer and Treasurer (Principal Accounting Officer)
Melissa Thomas
/s/ Eric Lefkofsky	Director
Eric Lefkofsky
/s/ Michael Angelakis	Director
Michael Angelakis
/s/ Peter J. Barris	Director
Peter J. Barris
/s/ Robert J. Bass	Director
Robert J. Bass
/s/ Theodore J. Leonsis	Director
Theodore J. Leonsis
/s/ Joseph Levin	Director
Joseph Levin
/s/ Deborah Wahl	Director
Deborah Wahl
/s/ Ann E. Ziegler	Director
Ann E. Ziegler

145

EX-10.9

Exhibit 10.9

GROUPON, INC.

NON-EMPLOYEE DIRECTORS' COMPENSATION PLAN

Amended and Restated as of October 17, 2018

The Company hereby establishes this Plan to assist the Company in attracting and retaining persons of competence and stature who are not employees to serve as Directors by providing them with competitive retainers, an ownership interest in the Company, and the opportunity to defer Retainers.

1.Effective Date. The Plan was initially effective as of the Effective Date and was amended and restated effective October 17, 2018.

2.Definitions. Where used in the Plan, the following capitalized words and terms shall have the meanings specified below, unless the context clearly indicates to the contrary:

(a)"Account" means the record keeping account established by the Committee for each Participant to which DSUs, and earnings thereon, are credited in accordance with Section 10 of the Plan.

(b)"Beneficiary" means such person(s) or legal entity that is designated by a Participant under Section 14 to receive benefits hereunder after such Participant's death.

(c)"Board" means the Company's Board of Directors.

(d)"Cash Retainer" means the portion of a Retainer which is payable in cash.

(e)"Change in Control" means such term as defined in the Incentive Plan. Notwithstanding the foregoing, if an amount payable under the Plan is "deferred compensation" for purposes of Code Section 409A, and if a payment of such amount would be accelerated or otherwise triggered upon a Change in Control, then the foregoing definition is modified, to the extent necessary to avoid the imposition of an excise tax under Code Section 409A, to mean a "change in control event" as such term is defined for purposes of Code Section 409A. For purposes of clarity, if an amount would, for example, vest and be paid on a Change in Control as defined herein but payment of such amount would violate the provisions of Code Section 409A, then the amount shall vest but will be paid only in compliance with its terms and Code Section 409A (i.e., upon a permissible payment event).

(f)"Code" means the Internal Revenue Code of 1986, as amended.

(g)"Code Section 409A" means Section 409A of the Code and all interpretive guidance issued thereunder by the U.S. Internal Revenue Service.

(h)"Committee" means a committee appointed to administer the Plan by the Board, or the properly designated delegate of such committee.

(i)"Company" means Groupon, Inc., a Delaware corporation.

(j)"Director" means each director who has been duly appointed to the Board.

(k)"Disability" means the individual is unable to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment which can be expected to result in death or can be expected to last for a continuous period of not less than twelve (12) months.

(l)"DSU" means a deferred share unit issued under and pursuant to the terms and conditions of the Incentive Plan.

(m)"Election Form" means such document(s) or form(s), which may be electronic, as prescribed and made available from time to time by the Committee, whereby a Participant elects to exchange all of his or her Cash Retainer and/or all of his or her RSUs for an award of DSUs.

(n)"Exchange Act" means the Securities Exchange Act of 1934.

(o)"Fair Market Value" as of a particular date shall mean the fair market value of a Share as determined in accordance with the Incentive Plan.

(p)"Incentive Plan" means the Groupon, Inc. 2011 Incentive Plan, as amended and restated.

(q)"Participant" means each Director who is not an employee of the Company.

(r)"Plan" means this Groupon, Inc. Non-Employee Directors' Compensation Plan.

(s)"Retainer" means the annual fee payable by the Company to a Participant with respect to his or her service on the Board, including both fees payable in cash and fees payable in Shares.

(t)"Retirement" means a Separation upon or after attaining seventy (70) years of age.

(u)"RSU" means a restricted share unit issued under and pursuant to the terms and conditions of the Incentive Plan.

(v)"RSU Retainer" means the portion of a Retainer which is payable in the form of RSUs.

(w)"Separation" means a Participant's ceasing to be a Director on account of a voluntary or involuntary separation from service, within the meaning of Code Section 409A, with the Board, for any reason.

(x)"Share" means a share of the Company's common stock.

(y)"Specified Employee" means a Participant who is determined by the Company to be a "specified employee" within the meaning of Code Section 409A with respect to a Separation occurring in any twelve (12) month period commencing on each April 1 based on the Participant's compensation with the Company, as defined in Code Section 416(i)(1)(D), and his or her status at the end of the immediately preceding calendar year.

3.Eligibility and Participation. Each Director who is not an employee of the Company and who is selected by the Committee for participation in the Plan shall be a Participant in the Plan. A Participant will cease to be a Participant in the Plan on the earlier to occur of (a) his or her Separation or (b) the date on which the Committee determines that he or she is no longer eligible to participate in the Plan.

4.Retainer. Each Participant shall be paid an annual Retainer in the amount of $250,000 in exchange for his or her service as a Director. In addition, the annual Retainer for the chair of (a) the Compensation Committee will be increased by $20,000, (b) the Nominating and Corporate Governance Committee will be increased by $15,000, and (c) the Audit Committee will be increased by $30,000. The Retainer shall be paid as follows: (a) 30% in the form of a Cash Retainer and (b) 70% in the form of an RSU Retainer. Any additional amount due to a Participant who serves as the chair of one of the aforementioned committees, shall be paid as follows: (a) 1/3 (one-third) in the form of a Cash Retainer and (b) 2/3 (two-thirds) in the form of an RSU Retainer. The Cash Retainer shall be paid to the Participant on a quarterly basis as soon as practicable, but in any event within thirty (30) days, following the end of a calendar quarter, for the future quarter's service. Each Director who becomes a Participant during a calendar quarter will be entitled to receive a quarterly Cash Retainer payment for such quarter, unless, immediately before becoming a Participant, he or she was an employee of the Company. The RSU Retainer shall be awarded to the Participant on an annual basis on the date of the Company's annual meeting of stockholders, with the number of RSUs to be granted determined by dividing the amount (in dollars) of the RSU Retainer by the Fair Market Value of a Share on such date. In the event that a Director becomes a Participant following the date of the annual meeting of stockholders but during the same calendar year as the annual meeting of the stockholders, the Board may, in its sole discretion, pay such Participant a pro-rated RSU Retainer with respect to his or her service during such year.

5.Vesting of RSUs. 100% of the RSUs awarded pursuant to an RSU Retainer shall vest and become non-forfeitable on the first anniversary of the date on which the applicable RSU Retainer was granted. Notwithstanding the foregoing, the following provisions shall apply in the circumstances described below:

(a)Death; Disability; Retirement. In the event of a Participant's Separation due to his or her death, Disability, or Retirement, vesting of the unvested portion of an RSU Retainer shall be accelerated upon the date of Separation.

(b)All Other Separations. In the event of a Participant's Separation for any reason other than his or her death, Disability, or Retirement, any unvested portion of an RSU Retainer shall immediately be cancelled and forfeited on the date of Separation.

(c)Change in Control. In the event of a Change in Control, vesting of the unvested portion of an RSU Retainer shall be accelerated upon the date of the Change in Control unless the RSU Retainer has been deferred.

6.Distribution of RSUs. RSUs shall be distributed as soon as administratively practicable, but in any event within sixty (60) days, following the date on which the RSUs vest in accordance with Section 5. In the event of a Participant's death, distribution will be made to the Participant's Beneficiary.

7.Deferral of Cash Retainer and RSU Retainer. Notwithstanding any provision of Sections 4, 5 or 6 hereof, a Participant may elect to exchange (i) all of his or her Cash Retainer and/or (ii) all of his or her RSU Retainer for an award of DSUs in the manner described in this Section 7. For purposes of clause (i) above, the number of DSUs to be awarded will be determined by dividing the amount of the Cash Retainer to be exchanged by the Fair Market Value of a Share as of the date(s) on which the Cash Retainer would otherwise have been paid, and DSUs will be credited to the Participant's Account effective as of the date on which the Cash Retainer would otherwise have been paid. For purposes of clause (ii) above, the DSUs will be awarded at a rate of one DSU for each RSU and shall be issued and credited to the Participant's Account effective as of the date that the RSUs would otherwise have settled in Shares. The Committee may establish procedures for deferral elections as it deems necessary to comply with the requirements of the Plan and Code Section 409A.

(a)Election. A Participant can make an election to receive DSUs by completing and executing an Election Form and filing the completed Election Form with the Committee. A Participant's Election Form shall remain in effect under the Plan until it is terminated by operation of the Plan or changed by the Participant in accordance with this Section. A Participant's Election Form must be filed with the Committee before expiration of the election period established by the Committee, which period shall end no later than December 31 of the immediately preceding calendar year. Notwithstanding the foregoing, a Participant may file an Election Form within the thirty (30) day period immediately following the date he or she first becomes a Participant, provided that the Cash Retainer or RSU Retainer being exchanged for DSUs relates to services performed after the date of such election.

(b)Revoking an Election. A Participant may elect to suspend or revoke a prior filed Election Form for services performed during a subsequent calendar year by filing a new Election Form before expiration of the election period established by the Committee, which period shall end no later than December 31 of the calendar year immediately preceding such year.

8.Distribution of DSUs. A Participant's Account shall be distributed to the Participant as soon as administratively possible, but in any event within thirty (30) days, following the Participant's Separation. In the event the Participant's Separation is due to the Participant's death, distribution will be made to the Participant's Beneficiary.

(a)Form of Payment. A Participant's Account shall be distributed in a single distribution in the form of Shares.

(b)Income Inclusion under Code Section 409A. Notwithstanding any provision of the Plan to the contrary, in the event that the Plan fails to meet the requirements of Code Section 409A, the Committee may distribute to Participants the portion of their Accounts that is required to be included in income as a result of such failure.

9.Source of Shares. The RSUs and DSUs that may be paid pursuant to the Plan shall be issued under the Incentive Plan subject to all of the terms and conditions of the Incentive Plan, and only to the extent that Shares remain available for issuance under the Incentive Plan. The terms and conditions of the Incentive Plan are incorporated into and made a part of this Plan with respect to any RSUs and DSUs paid pursuant to this Plan, and any awards of RSUs or DSUs shall be governed by and construed in accordance with the provisions of the Incentive Plan. In the event of any inconsistency between the Incentive Plan and this Plan with respect to RSUs or DSUs, the terms of the Incentive Plan shall control. The Plan does not constitute a separate source of Shares for the grant of the RSUs and DSUs described herein.

10.Accounts. The Committee shall establish and maintain, or cause to be established and maintained, a separate Account for each Participant hereunder who executes and files an Election Form pursuant to Section 7. Each such Participant's DSUs shall be separately accounted for and credited with earnings, to the extent applicable, for recordkeeping purposes only, to his or her Account. A Participant's Account shall be solely for the purposes of measuring the amounts to be paid under the Plan. The Company shall not be required to fund or secure a Participant's Account in any way, the Company's obligation to Participants hereunder being purely contractual.

11.Administration. The Plan shall be administered by the Committee. So long as the Company is subject to Section 16 of the Exchange Act, the Committee will consist of not fewer than two (2) members of the Board or such greater number as may be required for compliance with Rule 16b-3 issued under the Exchange Act and will be comprised of persons who are independent for purposes of applicable stock exchange listing requirements.

(a)Committee's Authority. The Committee shall have full discretionary authority to construe and interpret the terms and provisions of the Plan; to adopt, alter and repeal administrative rules, guidelines and practices governing the Plan; to perform all acts, including the delegation of its administrative responsibilities to advisors or other persons; and to rely upon the information or opinions of legal counselor experts selected to render advice with respect to the Plan, as it shall deem advisable, with respect to the administration of the Plan. The Committee may take any action, correct any defect, supply any omission or reconcile any inconsistency in the Plan, or in any election hereunder, in the manner and to the extent it shall deem necessary to carry the Plan into effect or to carry out the Company's purposes in adopting the Plan.

(b)Final Determinations. Any decision, interpretation or other action made or taken in good faith by or at the direction of the Company or the Committee arising out of or in connection with the Plan, shall be within the absolute discretion of each of them, and shall be final, binding and conclusive on the Company, and all Participants and Beneficiaries and their respective heirs, executors, administrators, successors and assigns. The Committee's determinations hereunder need not be uniform, and may be made selectively among Participants, whether or not they are similarly situated.

(c)Delegation of Authority. The Committee may, to the extent permitted by law, delegate some or all of its authority under the Plan to such officers of the Company as it deems appropriate. Unless the Committee otherwise specifies, any delegate will have the authority and right to exercise (within the scope of such person's delegated authority) all of the same powers and discretion that would otherwise be available to the Committee pursuant to the terms hereof. The Committee may also employ or appoint agents (who may be officers or employees of the Company) to assist in the administration of the Plan and to take such actions under the Plan on its behalf as the Committee deems appropriate.

(d)Indemnification. The Company shall indemnify the Committee and any individuals to whom administrative duties have been properly delegated under this Plan, against any and all claims, losses, damages, expenses and liabilities arising from their responsibilities in connection with this Plan, unless the same is determined to be due to gross negligence or willful misconduct.

(e)Plan Expenses. The expense of administering the Plan shall be borne by the Company.

12.Amendment or Termination. The Board may amend this Plan at any time and from time to time. The Board may terminate this Plan, to the extent such termination is permissible according to Treasury Regulations or other published guidance issued by the U.S. Department of Treasury or the Internal Revenue Service. Any amendment or termination of this Plan will not materially adversely affect the rights of a Participant accrued prior thereto without that Participant's written consent, except to the extent required by law or to conform the operation of the Plan to the requirements of Code Section 409A.

13.Taxes. The Company is not responsible for the tax consequences under federal, state or local law of any election made by any Participant under the Plan. All payments under the Plan are subject to withholding and reporting requirements to the extent required by applicable law. To the extent required by law in effect at the time a distribution is made from the Plan, the Company or its agents shall have the right to withhold or deduct from any distributions or payments any taxes required to be withheld by federal, state or local governments.

14.Participant and Beneficiary Information. Each Participant shall keep the Committee informed of his or her current address and the current address of his or her designated Beneficiary or Beneficiaries. A Participant may from time to time change his or her designated Beneficiary without the consent of such Beneficiary by filing a new designation in writing with the Committee. If no Beneficiary designation is in effect at the time of the Participant's death, or if the designated Beneficiary is missing or has predeceased the Participant, distribution shall be made to the Participant's surviving spouse, or if none, to his or her

surviving children per stirpes, and if none, to his or her estate. The Committee shall not be obligated to search for any person. If such person is not located within one (1) year after the date on which a payment or distribution is payable under the Plan, payment shall be made to the Participant's estate.

15.Right of Company to Take Actions. The adoption and maintenance of this Plan shall not be deemed to constitute a contract between the Company and a Director, or to be a consideration for, nor an inducement or condition of, the employment of any person. Nothing herein contained, or any action taken hereunder, shall be deemed to give a Director the right to be retained in the service of the Board or to interfere with the right of the Board to discharge the Director at any time for any reason, nor shall it be deemed to give to the Board the right to require the Director to remain in its employ, nor shall it interfere with the Director's right to terminate his or her service at any time. Nothing in this Plan shall prevent the Company from amending, modifying, or terminating any other benefit plan.

16.Headings. The headings of the sections and subsections of this Plan are for reference only. In the event of a conflict between a heading and the contents of a section or subsection, the contents of the section or subsection shall control.

17.Number and Gender. Whenever any words used herein are in the singular form, they shall be construed as though they were also used in the plural form in all cases where they would so apply, and references to the male gender shall be construed as applicable to the female gender where applicable, and vice versa.

18.Code Section 409A. Amounts payable under this Plan are intended to be exempt from or otherwise comply with the requirements of Code Section 409A. With respect to amounts payable under this Plan that constitute nonqualified deferred compensation within the meaning of Code Section 409A, the Plan is intended to be an unfunded nonqualified deferred compensation plan, and to the extent that the Plan is inconsistent with Code Section 409A, the applicable provisions of Code Section 409A shall be deemed to automatically supersede such inconsistent provisions. No amount under this Plan that constitutes nonqualified deferred compensation and is payable upon a Specified Employee's Separation shall be paid to such Specified Employee before the date that is at least six (6) months after the date of such Specified Employee's Separation (or, if earlier, the date of the Specified Employee's death).

19.Applicable Law. To the extent not preempted by federal law, this Plan shall be construed, administered and governed in all respects under and by the laws of the State of Delaware, without giving effect to its conflict of laws principles. The jurisdiction and venue for any disputes arising under, or any action brought to enforce (or otherwise relating to), this Plan shall be exclusively in the courts in the State of Illinois, County of Cook, including the Federal Courts located therein (should Federal jurisdiction exist).

20.Alienation or Assignment of Benefits. Except as otherwise provided under the Plan, a Participant's rights and interest under the Plan shall not be assigned or transferred except as otherwise provided herein, and the Participant's rights to benefit payments under the Plan shall not be subject to alienation, pledge or garnishment by or on behalf of creditors (including heirs, beneficiaries, or dependents) of the Participant or of a Beneficiary.

Company's Protection. By execution of an Election Form, each Participant shall be deemed to have agreed to cooperate with the Company by furnishing any and all information reasonably requested by the Committee in order to facilitate the payment of benefits hereunder.

Exhibit A

GROUPON, INC.

NON-EMPLOYEE DIRECTORS' COMPENSATION PLAN

CASH DEFERRAL ELECTION FORM

Please complete and return this Election Form to Groupon on or before December 31 of the year prior to the year in which you intend to exchange all of your Cash Retainer for deferred share units ("DSUs") under the Groupon, Inc. Non-Employee Directors' Compensation Plan (the "Plan"). However, if you are newly eligible to participate in the Plan, you may complete and return this Election Form during the 30-day period following the date on which you became a Participant. Capitalized terms used in this Election Form and not defined herein shall have the meaning ascribed to them in the Plan.

_________________________ First Name	_________________________ Middle Name			________________________ Last Name
__________________________________ Street Address		_______________ City		________ State	______________ Zip Code
_________________________ Social Security Number	_______________________ Date of Birth		MALE FEMALE
_________________________ Telephone Number	___________________________________ Email

ELECTION TO RECEIVE DEFERRED SHARE UNITS

As a non-employee director on Groupon's Board of Directors, you may elect to exchange all of your Cash Retainer for an award of DSUs, which will be credited to an account established for you under the Plan.

This election will be applied to your Cash Retainer effective January 1 of the year following the year in which you make and file this election. This election will remain in effect for each subsequent year until you file a new Election Form with the Committee in accordance with the terms of the Plan. Any new election will not be effective until January 1 of the year following the year in which the new election is made and filed.

However, if you are a new Participant in the Plan, and you make and file this election during the 30-day period following the date on which you became a Participant in the Plan, your election will be applied to your Cash Retainer paid after your Election Form is filed.

Please select one of the following:

I elect to exchange 100% of my Cash Retainer for an award of DSUs under the terms of the Plan.

I elect to exchange 0% of my Cash Retainer for an award of DSUs under the terms of the Plan.

Your DSUs will be paid to you on your Separation from service, in accordance with the terms of the Plan.

AGREEMENT AND AUTHORIZATION

I understand that my election to receive DSUs in exchange for my Cash Retainer is subject to review and final approval by the Committee, and that my election is governed by the terms and conditions of the Plan, as may be amended from time to time. The Plan and related Plan materials (if any) have been made available to me, and I have had the opportunity to ask questions and receive answers regarding the terms and conditions of the Plan. I hereby certify that the above information about me is true, accurate, and complete. I authorize Groupon to make the appropriate deductions, as indicated on this form, from my Cash Retainer. I acknowledge that I have been advised to consult with my own financial, tax, estate planning and legal advisors before making any election to defer compensation in order to determine the tax effects and other implications of my participation in the Plan.

_____________________________________

Director - Print Name

_____________________________________Date: _________________________

Director - Signature

Exhibit B

GROUPON, INC.

NON-EMPLOYEE DIRECTORS’ COMPENSATION PLAN RSU DEFERRAL ELECTION FORM

Please complete and return this Election Form to Groupon on or before December 31 of the year prior to the year in which you intend to exchange all of your RSU Retainer for DSUs under the Groupon, Inc. Non- Employee Directors' Compensation Plan (the "Directors Plan"). However, if you are newly eligible to participate in the Directors Plan, you may complete and return this Election Form during the 30-day period following the date on which you became a Participant.

As a non-employee director of Groupon, Inc., you are scheduled to receive an annual grant of restricted share units (“RSUs”) on the date of the Groupon Annual Meeting of Stockholders. In 2019 (and in future years until revised), you will be granted a number of RSUs equal to $175,000 (plus an additional $21,100 for the Chair of the Audit Committee; $13,400 for the Chair of the Compensation Committee; and $10,050 for the Chair of the Nominating Committee); divided by the Fair Market Value of a Share on the grant date. These RSUs will vest one year from the grant date. The terms of the Groupon, Inc. 2011 Incentive Plan, as amended (the “Incentive Plan”) and the Directors Plan are incorporated herein in their entirety and made a part of this form. Unless otherwise indicated, any capitalized term used but not defined herein has the meaning ascribed to such term in the Incentive Plan or Directors Plan, as applicable.

Under the provisions of the Incentive Plan and the Directors Plan, you may elect to defer the settlement (in Shares) of all of your RSUs by exchanging such RSUs for an award of DSUs, which will be credited to an account established for you under the Directors Plan as of the date your RSUs would have otherwise settled. Upon making a timely deferral election, your RSUs will remain subject to the same vesting terms but shall be exchanged for DSUs on the original vesting date on the basis of one DSU for each RSU, and no Shares will be issued to you at the time such Shares would otherwise be issued under the Incentive Plan. Dividend Equivalents shall be credited on DSUs and distributed at the same time that Shares are delivered to you in settlement of the DSUs. This election will remain in effect for each subsequent year until you file a new Election Form with the Committee in accordance with the terms of the Directors Plan. Any new election will not be effective until January 1 of the year following the year in which the new election is made and filed. This election applies to all future grants of RSUs until a new Election Form is filed, but, for the avoidance of doubt, will not apply to any other types of equity awards you may receive.

By completing this form, I hereby elect to defer the settlement (in Shares) of the RSUs granted to me under the 2019 RSU grant (and future years’ RSU grants until a new Election Form is filed) by exchanging my RSUs for an award of DSUs as follows:

1. Percentage of RSUs to be deferred (please select one):

One Hundred Percent (100%)Zero Percent (0%)

Your DSUs will be settled and paid to you in Shares on your Separation from service as a director, in accordance with the terms of the Directors Plan.

I understand that by making a deferral election, I will not receive Shares payable upon the vesting of my RSUs and instead will receive DSUs, which will be settled and distributed in Shares upon

my Separation from service as a director. I further understand that this deferral election is irrevocable with respect to the 2019 RSU grant after December 31, 2018.

This Deferral Election Form, the Incentive Plan and the Directors Plan are intended to comply with the applicable requirements of Section 409A of the Code and will be limited, construed and interpreted in a manner so as to comply therewith. I acknowledge and agree that Groupon, Inc. reserves the right to amend my election, the Incentive Plan and the Directors Plan at any time to comply with the requirements of Section 409A of the Code.

AGREEMENT AND AUTHORIZATION

I understand that my election is subject to review and final approval by the Committee, and that my election is governed by the terms and conditions of the Incentive Plan and the Directors Plan, as may be amended from time to time. The Directors Plan and related plan materials (if any) have been made available to me, and I have had the opportunity to ask questions and receive answers regarding the terms and conditions of the Directors Plan. I hereby certify that the above information about me is true, accurate, and complete. Iacknowledge that I have been advised to consult with my own financial, tax, estate planning and legal advisors before making any election to defer compensation in order to determine the tax effects and other implications of my participation in the Plan.

This Deferral Election Form must be signed and returned to Groupon, Inc. prior to the close of business on Monday, December 31, 2018.

_____________________________________

Director - Print Name

_____________________________________Date: _________________________

Director - Signature

EX-21.1

Exhibit 21.1

Subsidiary	Jurisdiction
Groupon Canada Inc.	Canada
Groupon Activities, LLC	Delaware (U.S.A.)
Groupon Distribution Services, LLC	Delaware (U.S.A.)
Groupon Merchant Services, LLC	Virginia (U.S.A.)
GI International Holdings, Inc.	Delaware (U.S.A.)
Groupon Canada Corp, Inc.	Delaware (U.S.A.)
Groupon Getaways, Inc.	Delaware (U.S.A.)
Groupon Goods, Inc.	Delaware (U.S.A.)
Groupon Product Services, LLC	Delaware (U.S.A.)
Groupon Trailblazer, Inc.	Delaware (U.S.A.)
GrouponLive, LLC	Delaware (U.S.A.)
LivingSocial, LLC	Delaware (U.S.A.)
Obtiva, Inc.	Illinois (U.S.A.)
GROUPON S.P.R.L.	Belgium
Groupon France SAS	France
Groupon Goods France	France
Groupon Europe GmbH	Germany
Groupon Goods Germany GmbH	Germany
Groupon International Ltd.	Ireland
Groupon-CityDeal (Ireland) Ltd.	Ireland
Groupon Goods Italy S.r.l.	Italy
Groupon S.r.l.	Italy
GI Luxembourg S.a.r.l	Luxembourg
Groupon SARL	Morocco
Groupon Goods Netherlands B.V.	Netherlands
Groupon Holdings B.V.	Netherlands
Groupon Netherlands B.V.	Netherlands
Groupon Goods Poland sp. z.o.o.	Poland
Groupon Sp.z o.o.	Poland
Groupon Shared Services Poland Sp. z.o.o.	Poland
Groupon Spain, SLU	Spain
Groupon Goods Global GmbH	Switzerland
Groupon International GmbH	Switzerland
Groupon International Travel GmbH	Switzerland
Groupon FZ-LLC	United Arab Emirates
Groupon Goods UK Ltd.	United Kingdom
Groupon Shop Ltd.	United Kingdom
MyCity Deal Ltd.	United Kingdom
Groupon Australia Pty Ltd.	Australia
Groupon Getaways Pty Ltd.	Australia
Groupon Shared Services Private Limited	India
Groupon Japan, Inc.	Japan
Groupon New Zealand Limited	New Zealand

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333-214351 on Form S-8 and Registration Statements No. 333-223025 and No. 333-223024 on Form S-3 of our reports dated February 12, 2019, relating to the financial statements and financial statement schedule of Groupon, Inc. and subsidiaries (the “Company”), and the effectiveness of the Company’s internal control over financial reporting dated February 12, 2019, appearing in this Annual Report on Form 10-K of Groupon, Inc. for the year ended December 31, 2018.

/s/ DELOITTE & TOUCHE LLP

Chicago, Illinois

February 12, 2019

EX-23.2

Exhibit 23.2

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in (1) the Registration Statement (Form S-8 No. 333-214351) pertaining to the 2012 Employee Stock Purchase Plan, 2011 Incentive Plan, 2010 Stock Plan, and 2008 Stock Option Plan of Groupon, Inc.,(2) the Registration Statement (Form S-3 ASR No. 333-223025) of Groupon, Inc. of our report dated February 15, 2017 (except for Notes 1, 3 and 19, as to which the date is May 17, 2017, and Note 2, as to which the date is February 12, 2019) and (3) the Registration Statement (Form S-3 ASR No. 333-223024), with respect to the 2016 consolidated financial statements and schedule presented on a comparative basis with the 2017 and 2018 consolidated financial statements and schedule of Groupon, Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 2018.

/s/ Ernst & Young LLP

Chicago, Illinois

February 12, 2019

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Rich Williams, certify that:

1.I have reviewed this Annual Report on Form 10-K of Groupon, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 12, 2019                /s/ Rich Williams

Rich Williams

Chief Executive Officer

(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Michael Randolfi, certify that:

1.I have reviewed this Annual Report on Form 10-K of Groupon, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 12, 2019                /s/ Michael Randolfi

Michael Randolfi

Chief Financial Officer

(Principal Financial Officer)

EX-32.1

Exhibit 32.1

Certifications Pursuant to

18 U.S.C. Section 1350

As Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Annual Report of Groupon, Inc. (the "Company") on Form 10-K for the period ended December 31, 2018, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Rich Williams, Chief Executive Officer of the Company, and Michael Randolfi, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to our knowledge, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:    /s/ Rich Williams

Rich Williams

Chief Executive Officer

(Principal Executive Officer)

By:    /s/ Michael Randolfi

Michael Randolfi

Chief Financial Officer

(Principal Financial Officer)

Date:    February 12, 2019

XML

DOCUMENT AND ENTITY INFORMATION - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 08, 2019	Jun. 30, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	Groupon, Inc.
Entity Central Index Key	0001490281
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		570,314,522
Emerging Growth Company	false
Smaller Reporting Company	false
Entity Shell Company	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 2,034,326,435

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 841,021	$ 880,129
Accounts receivable, net	69,493	98,294
Prepaid expenses and other current assets	88,115	94,025
Total current assets	998,629	1,072,448
Property, equipment and software, net	143,117	151,145
Goodwill	325,491	286,989
Intangible assets, net	45,401	19,196
Investments (including $84,242 and $109,751 at December 31, 2018 and December 31, 2017 at fair value)	108,515	135,189
Other non-current assets	20,989	12,538
Total Assets	1,642,142	1,677,505
Current liabilities:
Accounts payable	38,359	31,968
Accrued merchant and supplier payables	651,781	770,335
Accrued expenses and other current liabilities	267,034	331,196
Total current liabilities	957,174	1,133,499
Convertible senior notes, net	201,669	189,753
Other non-current liabilities	100,688	102,408
Total Liabilities	1,259,531	1,425,660
Commitments and contingencies (see Note 10)
Stockholders' Equity
Common stock, par value $0.0001 per share, 2,010,000,000 shares authorized; 760,939,440 shares issued and 569,084,312 shares outstanding at December 31, 2018; 748,541,862 shares issued and 559,939,620 shares outstanding at December 31, 2017	76	75
Additional paid-in capital	2,234,560	2,174,708
Treasury stock, at cost, 191,855,128 and 188,602,242 shares at December 31, 2018 and December 31, 2017	(877,491)	(867,450)
Accumulated deficit	(1,010,499)	(1,088,204)
Accumulated other comprehensive income	34,602	31,844
Total Groupon, Inc. Stockholders' Equity	381,248	250,973
Noncontrolling interests	1,363	872
Total Equity	382,611	251,845
Total Liabilities and Equity	$ 1,642,142	$ 1,677,505

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments, Fair Value Disclosure	$ 84,242	$ 109,751
Common stock, par value (in usd per share)	$ 3.20
Common Stock
Common stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	2,010,000,000	2,010,000,000
Common stock, shares issued (in shares)	760,939,440	748,541,862
Common stock, shares outstanding (in shares)	569,084,312	559,939,620
Treasury Stock
Treasury stock (in shares)	191,855,128	188,602,242

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		3 Months Ended																12 Months Ended
	May 09, 2016	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Revenue:
Total revenue																		$ 2,636,746		$ 2,843,877		$ 3,013,615
Cost of revenue:
Total cost of revenue																		1,316,145		1,510,016		1,732,962
Gross profit		$ 366,069		$ 305,989	[1]	$ 323,658	[1]	$ 324,885		$ 386,918		$ 309,425		$ 328,067		$ 309,451		1,320,601		1,333,861		1,280,653
Operating expenses:
Marketing																		395,737		400,918		352,175
Selling, general and administrative																		870,961		901,829		999,677
Restructuring charges												11,500		4,600		2,700		(136)		18,828		40,438
Gain on sale of intangible assets																		0		(17,149)		0
Gain on business dispositions	$ 7,600																	0		0		11,399
Total operating expenses																		1,266,562		1,304,426		1,380,891
Income (loss) from operations		61,876		53,023	[1]	(64,245)	[1]	3,385		49,726		(1,213)		(7,398)		(11,680)		54,039	[2],[3],[4],[5]	29,435	[2],[3],[4],[5]	(100,238)	[2],[3],[4],[5]
Other income (expense), net																		(53,008)		6,710		(71,289)
Income (loss) from continuing operations before provision (benefit) for income taxes																		1,031		36,145		(171,527)
Provision (benefit) for income taxes																		(957)		7,544		(5,318)
Income (loss) from continuing operations		49,862		47,175		(92,254)		(2,795)		51,071		3,802		(5,403)		(20,869)		1,988		28,601		(166,209)
Income (loss) from discontinued operations, net of tax		0	[6]	0	[1],[6]	0	[1],[6]	0	[6]	(223)	[6]	(862)	[6]	(1,376)	[6]	487	[6]	0		(1,974)	[7],[8]	(17,114)	[7]
Net income (loss)																		1,988		26,627		(183,323)
Net income attributable to noncontrolling interests																		13,067		12,587		11,264
Net income (loss) attributable to Groupon, Inc.		$ 46,228		$ 44,615	[1]	$ (95,034)	[1]	$ (6,888)		$ 47,721		$ 59		$ (9,326)		$ (24,414)		$ (11,079)		$ 14,040		$ (194,587)
Basic net income (loss) per share (1):
Continuing operations (in usd per share)		$ 0.08	[9]	$ 0.08	[1],[9]	$ (0.17)	[1],[9]	$ (0.01)	[9]	$ 0.09	[9]	$ 0.00	[9]	$ (0.01)	[9]	$ (0.04)	[9]	$ (0.02)		$ 0.03		$ (0.31)	[10],[11]
Discontinued operations (in usd per share)		0.00	[9]	0.00	[1],[9]	0.00	[1],[9]	0.00	[9]	0.00	[9]	0.00	[9]	(0.01)	[9]	0.00	[9]	0.00		0.00		(0.03)	[10],[11]
Basic net income (loss) per share (in usd per share)		0.08	[9]	0.08	[1],[9]	(0.17)	[1],[9]	(0.01)	[9]	0.09	[9]	0.00	[9]	(0.02)	[9]	(0.04)	[9]	(0.02)		0.03		$ (0.34)	[10],[11]
Diluted net income (loss) per share (1):
Continuing operations (in usd per share)		0.08	[9]	0.08	[1],[9]	(0.17)	[1],[9]	(0.01)	[9]	0.08	[9]	0.00	[9]	(0.01)	[9]	(0.04)	[9]	(0.02)		0.03
Discontinued operations (in usd per share)		0.00	[9]	0.00	[1],[9]	0.00	[1],[9]	0.00	[9]	0.00	[9]	0.00	[9]	(0.01)	[9]	0.00	[9]	0.00		(0.01)
Diluted net income (loss) per share (in usd per share)		$ 0.08	[9]	$ 0.08	[1],[9]	$ (0.17)	[1],[9]	$ (0.01)	[9]	$ 0.08	[9]	$ 0.00	[9]	$ (0.02)	[9]	$ (0.04)	[9]	$ (0.02)		$ 0.02
Weighted average number of shares outstanding (1):
Basic (in shares)																		566,511,108		559,367,075
Diluted (in shares)																		566,511,108		568,418,371		576,354,258	[10]
Service
Revenue:
Total revenue																		$ 1,205,487		$ 1,266,452		$ 1,206,441
Cost of revenue:
Total cost of revenue																		120,077		160,810		150,031
Product
Revenue:
Total revenue																		1,431,259		1,577,425		1,807,174
Cost of revenue:
Total cost of revenue																		$ 1,196,068		$ 1,349,206		$ 1,582,931

[1] Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

[2] Includes a $34.6 million charge related to the IBM patent litigation matter for North America for the year ended December 31, 2018. See Note 10, Commitments and Contingencies, for additional information.

[3] Includes acquisition-related (benefit) expense, net of $0.7 million for International for the year ended December 31, 2018 and $5.7 million for North America for the year ended December 31, 2016.

[4] Includes restructuring charges for North America and International. See Note 14, Restructuring, for restructuring charges by segment.

[5] Includes stock-based compensation of $59.7 million, $76.1 million and $104.7 million for North America and $5.0 million, $5.7 million and $9.5 million for International for the years ended December 31, 2018, 2017 and 2016, respectively.

[6] Income (loss) from continuing operations includes restructuring charges of $11.5 million, $4.6 million and $2.7 million for the three months ended September 30, 2017, June 30, 2017 and March 31, 2017. Restructuring charges were not material for any quarterly period during the year ended December 31, 2018 or for the three months ended December 31, 2017.

[7] (1)The loss from discontinued operations before gain (loss) on dispositions and provision for income taxes for the years ended December 31, 2017 and 2016 includes the results of each business through its respective disposition date.

[8] (2)Selling, general and administrative expense from discontinued operations for the year ended December 31, 2017 includes increases to contingent liabilities under indemnification agreements. See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

[9] The sum of per share amounts for quarterly periods may not equal year-to-date amounts due to rounding.

[10] The potentially dilutive impacts of a conversion of Class B to Class A shares, outstanding equity awards, warrants and convertible senior notes have been excluded from the calculation of dilutive net income (loss) per share for the years ended December 31, 2016 as their effect on net income (loss) per share from continuing operations was antidilutive.

[11] The shares of Class A and Class B common stock had equal dividend rights and converted into shares of common stock on a one-for-one basis on October 31, 2016. This full year column reflects the weighted average Class A and Class B common shares outstanding for the period from January 1, 2016 through the October 31, 2016 conversion date and the weighted average common shares outstanding for the period from November 1, 2016 through December 31, 2016 in the denominator of the basic and diluted loss per share calculations for the year ended December 31, 2016.

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Statement of Income Captions [Line Items]
Income (loss) from continuing operations	$ 1,988	$ 28,601	$ (166,209)
Other comprehensive income (loss) from continuing operations:
Net change in unrealized gain (loss) on foreign currency translation adjustment	3,332	(27,287)	5,988
Other comprehensive income (loss) from discontinued operations - Foreign currency translation adjustments:
Comprehensive income (loss)	4,585	419	(176,477)
Comprehensive income attributable to noncontrolling interests	(13,067)	(12,587)	(11,264)
Comprehensive income (loss) attributable to Groupon, Inc.	(8,482)	(12,168)	(187,741)
Tax effect	34	0	43
Continuing Operations
Condensed Statement of Income Captions [Line Items]
Income (loss) from continuing operations	1,988	28,601	(166,209)
Other comprehensive income (loss) from continuing operations:
Net change in unrealized gain (loss) on foreign currency translation adjustment	3,332	(10,776)	8,361
Net change in unrealized gain (loss) on defined benefit pension plan	0	585	928
Net unrealized gain (loss) during the period	(841)	(1,109)	(70)
Reclassification adjustment for realized (gain) loss on investment included in income (loss) from continuing operations	106	1,603	0
Net change in unrealized gain (loss) on available-for-sale securities	(735)	494	(70)
Other comprehensive income (loss) from discontinued operations - Foreign currency translation adjustments:
Other comprehensive income (loss)	2,597	(9,697)	9,219
Comprehensive income (loss)	4,585	18,904	(156,990)
Discontinued Operations, Disposed of by Sale
Other comprehensive income (loss) from continuing operations:
Net change in unrealized gain (loss) on available-for-sale securities	0	(16,511)	(2,373)
Income (loss) from discontinued operations	0	(1,974)	(17,114)
Other comprehensive income (loss) from discontinued operations - Foreign currency translation adjustments:
Net unrealized gain (loss) during the period	0	(1,793)	(9,305)
Reclassification adjustment included in income (loss) from discontinued operations	0	(14,718)	6,932
Other comprehensive income (loss)	$ 0	$ (18,485)	$ (19,487)

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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands		Total		Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Total Groupon, Inc. Stockholders' Equity	Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2015				719,787,422
Beginning balance at Dec. 31, 2015		$ 470,587		$ 72	$ 1,964,453		$ (901,292)	$ 51,206	$ 469,398	$ 1,189
Treasury stock, beginning balance (in shares) at Dec. 31, 2015						128,468,165
Treasury stock, beginning balance at Dec. 31, 2015						$ (645,041)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle, net of tax							(3,131)		(3,131)
Reclassification for impact of U.S. tax rate change	[1]	7,135
Net income (loss) attributable to noncontrolling interest		(183,323)					(194,587)			11,264
Net income (loss) attributable to parent		(194,587)							(194,587)
Foreign currency translation		5,988						5,988	5,988
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax		928						928	928
Unrealized gain (loss) on available-for-sale securities, net of tax		(70)						(70)	(70)
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited				(196,968)
Exercise in stock options (in shares)				491,483
Exercise of stock options		620			620				620
Vesting of restricted stock units and performance share units (in shares)				22,698,324
Vesting of restricted stock units and performance share units				$ 3	(3)
Shares issued under employee stock purchase plan (in shares)				1,669,782
Shares issued under employee stock purchase plan		4,358			4,358				4,358
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)				(7,918,272)
Tax withholdings related to net share settlements of stock-based compensation awards		(31,161)		$ 1	(31,160)				(31,161)
Stock-based compensation on equity-classified awards		131,114			131,114				131,114
Equity component of convertible debt		67,014			67,014				67,014
Adjustments to Additional Paid in Capital, Warrant Issued		(59,163)			(59,163)				(59,163)
Adjustments to Additional Paid in Capital, Warrant Issued		35,495			35,495				35,495
Treasury Stock, Shares, Acquired						(43,227,743)
Treasury Stock, Value, Acquired, Par Value Method		(162,383)				$ (162,383)			(162,383)
Distributions to noncontrolling interest holders		(11,811)								(11,811)
Ending balance (in shares) at Dec. 31, 2016				736,531,771
Ending balance at Dec. 31, 2016		265,062		$ 74	2,112,728		(1,099,010)	58,052	264,420	642
Treasury stock, ending balance (in shares) at Dec. 31, 2016						171,695,908
Treasury stock, ending balance at Dec. 31, 2016						$ (807,424)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle, net of tax							(3,234)		(3,234)
Reclassification for impact of U.S. tax rate change	[1]	20,466
Net income (loss) attributable to noncontrolling interest		26,627					14,040			12,587
Net income (loss) attributable to parent		14,040							14,040
Foreign currency translation		(27,287)						(27,287)	(27,287)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax		585						585	585
Unrealized gain (loss) on available-for-sale securities, net of tax		494						494	494
Exercise in stock options (in shares)				102,803
Exercise of stock options		230			230				230
Vesting of restricted stock units and performance share units (in shares)				16,596,562
Vesting of restricted stock units and performance share units				$ 2	(2)
Shares issued under employee stock purchase plan (in shares)				1,879,656
Shares issued under employee stock purchase plan		5,283			5,283				5,283
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)				(6,568,930)
Tax withholdings related to net share settlements of stock-based compensation awards		(27,188)		$ 1	(27,187)				(27,188)
Stock-based compensation on equity-classified awards		83,656			83,656				83,656
Adjustments to Additional Paid in Capital, Warrant Issued		0
Treasury Stock, Shares, Acquired						(16,906,334)
Treasury Stock, Value, Acquired, Par Value Method		(60,026)				$ (60,026)			(60,026)
Distributions to noncontrolling interest holders		$ (12,357)								(12,357)
Ending balance (in shares) at Dec. 31, 2017		0		748,541,862
Ending balance at Dec. 31, 2017		$ 251,845		$ 75	2,174,708		(1,088,204)	31,844	250,973	872
Treasury stock, ending balance (in shares) at Dec. 31, 2017						(188,602,242)
Treasury stock, ending balance at Dec. 31, 2017		867,450				$ (867,450)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle, net of tax		88,945					88,945		88,945
Reclassification for impact of U.S. tax rate change		1,544	[1]				(161)	161
Net income (loss) attributable to noncontrolling interest		1,988					(11,079)			13,067
Net income (loss) attributable to parent		(11,079)							(11,079)
Foreign currency translation		3,332						3,332	3,332
Unrealized gain (loss) on available-for-sale securities, net of tax		$ (735)						(735)	(735)
Exercise in stock options (in shares)		672,793		672,793
Exercise of stock options		$ 81			81				81
Vesting of restricted stock units and performance share units (in shares)				14,264,895
Vesting of restricted stock units and performance share units				$ 1	(1)
Shares issued under employee stock purchase plan (in shares)				1,621,061
Shares issued under employee stock purchase plan		5,634			5,634				5,634
Shares issued to settle liability-classified awards (in shares)				1,240,379
Shares issued to settle liability-classified awards		6,436			6,436				6,436
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)				(5,401,550)
Tax withholdings related to net share settlements of stock-based compensation awards		(22,709)			(22,709)				(22,709)
Stock-based compensation on equity-classified awards		70,411			70,411				70,411
Adjustments to Additional Paid in Capital, Warrant Issued		0
Treasury Stock, Shares, Acquired						(3,252,886)
Treasury Stock, Value, Acquired, Par Value Method		(10,041)				$ (10,041)			(10,041)
Distributions to noncontrolling interest holders		(12,576)								(12,576)
Ending balance (in shares) at Dec. 31, 2018				760,939,440
Ending balance at Dec. 31, 2018		382,611		$ 76	$ 2,234,560		$ (1,010,499)	$ 34,602	$ 381,248	$ 1,363
Treasury stock, ending balance (in shares) at Dec. 31, 2018						(191,855,128)
Treasury stock, ending balance at Dec. 31, 2018		$ 877,491				$ (877,491)

[1] The effect of income tax rate changes on deferred items for the year ended December 31, 2017 is primarily related to the U.S. tax reform legislation that was signed into law on December 22, 2017, which included a reduction of the U.S. Federal income tax rate to 21 percent. That rate reduction did not impact the Company's provision for income taxes for the year ended December 31, 2017 due to the valuation allowance against the Company's U.S. net deferred tax assets.

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Operating activities
Net income (loss)	$ 1,988	$ 26,627		$ (183,323)
Less: Income (loss) from discontinued operations, net of tax	0	(1,974)	[1],[2]	(17,114)	[1]
Income (loss) from continuing operations	1,988	28,601		(166,209)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization of property, equipment and software	101,330	114,795		116,961
Amortization of acquired intangible assets	14,498	23,032		18,948
Stock-based compensation	64,821	82,044		115,123
Gain on business dispositions	0	0		(11,399)
Gain on sale of intangible assets	0	(17,149)		0
Gain on sale of intangible assets	0	(7,624)		0
Restructuring-related long-lived asset impairment	0	0		328
Impairments of investments	10,156	2,944		0
Deferred income taxes	(5,000)	603		(10,448)
(Gain) loss, net from changes in fair value of contingent consideration	0	0		4,092
(Gain) loss from changes in fair value of investments	9,064	(382)		48,141
Amortization of debt discount on convertible senior notes	11,916	10,758		7,376
Change in assets and liabilities, net of acquisitions and dispositions:
Accounts receivable	32,057	(18,793)		(16,584)
Prepaid expenses and other current assets	7,166	4,074		35,043
Accounts payable	5,805	(199)		5,121
Accrued merchant and supplier payables	(45,268)	(29,823)		26,729
Accrued expenses and other current liabilities	(31,430)	(40,361)		(32,124)
Other, net	13,752	(21,975)		(10,853)
Net cash provided by (used in) operating activities from continuing operations	190,855	130,545		130,245
Net cash provided by (used in) operating activities from discontinued operations	0	(2,418)		(11,823)
Net cash provided by (used in) operating activities	190,855	128,127		118,422
Investing activities
Purchases of property and equipment and capitalized software	(69,695)	(59,158)		(68,287)
Cash derecognized upon dispositions of subsidiaries	0	0		(1,128)
Proceeds from sale of intangible assets	1,500	18,333		0
Proceeds from sales and maturities of investments	8,594	16,561		1,685
Acquisitions of businesses, net of acquired cash	(58,119)	0		14,539
Acquisitions of intangible assets and other investing activities	(18,262)	(1,059)		(2,395)
Net cash provided by (used in) investing activities from continuing operations	(135,982)	(25,323)		(55,586)
Net cash provided by (used in) investing activities from discontinued operations	0	(9,548)		(1,900)
Net cash provided by (used in) investing activities	(135,982)	(34,871)		(57,486)
Financing activities
Proceeds from issuance of convertible senior notes	0	0		250,000
Issuance costs for convertible senior notes and revolving credit agreement	0	0		(8,147)
Purchase of convertible note hedges	0	0		(59,163)
Proceeds from issuance of warrants	0	0		35,495
Payments for purchases of treasury stock	(9,585)	(61,233)		(165,357)
Taxes paid related to net share settlements of stock-based compensation awards	(24,105)	(27,681)		(29,777)
Proceeds from stock option exercises and employee stock purchase plan	5,715	5,513		4,978
Distributions to noncontrolling interest holders	(12,576)	(12,357)		(11,811)
Payments of capital lease obligations	(33,023)	(34,025)		(30,598)
Payments of contingent consideration related to acquisitions	(1,815)	(7,790)		(285)
Payment of financing obligation related to acquisition	(8,391)	0		0
Other financing activities	(637)	(473)		0
Net cash provided by (used in) financing activities	(84,417)	(138,046)		(14,665)
Effect of exchange rate changes on cash, cash equivalents and restricted cash, including cash classified within current assets of discontinued operations	(11,209)	26,499		(6,718)
Net increase (decrease) in cash, cash equivalents and restricted cash, including cash classified within current assets of discontinued operations	(40,753)	(18,291)		39,553
Less: Net increase (decrease) in cash classified within current assets of discontinued operations	0	(28,866)		(186)
Net increase (decrease) in cash, cash equivalents and restricted cash	(40,753)	10,575		39,739
Cash, cash equivalents and restricted cash, beginning of period	885,481	874,906		835,167
Cash, cash equivalents and restricted cash, end of period	844,728	885,481		874,906
Supplemental disclosure of cash flow information
Income tax payments (refunds)	2,781	8,646		(7,208)
Cash paid for interest	9,556	9,425		1,185
Non-cash investing and financing activities
Equipment acquired under capital lease obligations	18,064	28,271		21,611
Leasehold improvements funded by lessor	557	402		4,990
Liability for purchases of treasury stock	456	0		1,207
Increase (decrease) in liabilities related to purchases of property and equipment and capitalized software	(482)	(972)		(3,855)
Investments acquired in connection with business dispositions	0	2,022		13,507
Contingent consideration liability incurred in connection with acquisition of business	1,529	0		0
Discontinued Operations
Supplemental disclosure of cash flow information
Income tax payments (refunds)	$ 0	$ (56)		$ 2,953

[1] (1)The loss from discontinued operations before gain (loss) on dispositions and provision for income taxes for the years ended December 31, 2017 and 2016 includes the results of each business through its respective disposition date.

[2] (2)Selling, general and administrative expense from discontinued operations for the year ended December 31, 2017 includes increases to contingent liabilities under indemnification agreements. See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

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DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

Company Information

Groupon, Inc. and subsidiaries, which commenced operations in October 2008, operates online local commerce marketplaces throughout the world that connect merchants to consumers by offering goods and services, generally at a discount. Customers access those marketplaces through our websites, primarily localized groupon.com sites in many countries, and our mobile applications.

Our operations are organized into two segments: North America and International. See Note 19, Segment Information.

In connection with a strategic initiative to optimize our global footprint, we sold our operations in 11 countries and ceased operations in another country between November 2016 and March 2017. The financial results of those operations have been presented as discontinued operations in the consolidated financial statements for the years ended December 31, 2017 and 2016. See Note 3, Discontinued Operations and Other Business Dispositions, for additional information.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation

The consolidated financial statements include the accounts of Groupon, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The consolidated financial statements were prepared in accordance with U.S. GAAP and include the assets, liabilities, revenue and expenses of all wholly-owned subsidiaries and majority-owned subsidiaries over which we exercise control and variable interest entities for which we have determined that we are the primary beneficiary. Outside stockholders' interests in subsidiaries are shown on the consolidated financial statements as Noncontrolling interests. Investments in entities in which we do not have a controlling financial interest are accounted for under the equity method, the fair value option, as available-for-sale securities or at cost adjusted for observable price changes and impairments, as appropriate.

Adoption of New Accounting Standards

We adopted the guidance in ASC Topic 606, Revenue from Contracts with Customers, on January 1, 2018. Topic 606 is a comprehensive new revenue recognition model that requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. See Note 13, Revenue Recognition, for information on the impact of adopting Topic 606 on our accounting policies.

We adopted the guidance in ASU 2016-01, Financial Instruments (Topic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities, as amended, on January 1, 2018. This ASU generally requires equity investments to be measured at fair value with changes in fair value recognized through net income and eliminates the cost method for equity securities. However, for equity investments without readily determinable fair values, the ASU permits entities to elect to measure the investments at cost adjusted for observable price changes and impairments, with changes in the measurement recognized through net income. We applied that measurement alternative to our equity investments that were previously accounted for under the cost method. The adoption of ASU 2016-01 did not have a material impact on the consolidated financial statements.

We adopted the guidance in ASU 2016-18, Statement of Cash Flows (Topic 230) - Restricted Cash, on January 1, 2018. This ASU requires companies to include amounts generally described as restricted cash and restricted cash equivalents, along with cash and cash equivalents, when reconciling the beginning-of-period and end-of-period amounts shown on the statement of cash flows. Previously, changes in restricted cash were reported within cash flows from operating activities. We applied that change in cash flow classification on a retrospective basis, which resulted in a $7.0 million decrease and a $1.3 million increase to net cash provided by operating activities for the years ended December 31, 2017 and 2016.

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets to amounts shown in the consolidated statements of cash flows, as of December 31, 2018, 2017 and 2016 (in thousands):

	December 31, 2018		December 31, 2017		December 31, 2016
Cash and cash equivalents	$	841,021	$	880,129	$	862,977
Restricted cash included in prepaid expenses and other current assets	3,320		4,932		5,769
Restricted cash included in other non-current assets	387		420		6,160
Cash, cash equivalents and restricted cash	$	844,728	$	885,481	$	874,906

We adopted the guidance in ASU 2017-05, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20) - Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets, on January 1, 2018. This ASU is meant to clarify the scope of ASC Subtopic 610-20, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets, and to add guidance for partial sales of nonfinancial assets. The adoption of ASU 2017-05 did not have a material impact on the consolidated financial statements.

We adopted the guidance in ASU 2017-07, Compensation - Retirement Benefits (Topic 715) - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, on January 1, 2018. This ASU requires employers to include only the service cost component of net periodic pension cost in operating expenses, together with other employee compensation costs. The other components of net periodic pension cost, including interest cost, expected return on plan assets, amortization of prior service cost and settlement and curtailment effects, are to be included in non-operating expenses. The adoption of ASU 2017-07 did not have a material impact on the consolidated financial statements.

We adopted the guidance in ASU 2017-09, Compensation - Stock Compensation (Topic 718) - Scope of Modification Accounting, on January 1, 2018. This ASU clarifies the changes to terms or conditions of a share-based payment award that require an entity to apply modification accounting. The adoption of ASU 2017-09 did not have a material impact on the consolidated financial statements.

We adopted the guidance in ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, as of January 1, 2018. This ASU permits a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (the "Jobs Act"). As a result of the adoption of ASU 2018-02, we reclassified $0.2 million from accumulated other comprehensive income to accumulated deficit.

We adopted the guidance in ASU 2017-01, Business Combinations (Topic 805) - Clarifying the Definition of a Business, on July 1, 2017. This ASU provides clarification on the definition of a business and provides guidance on whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The guidance in ASU 2017-01 was applied in determining that the sale of customer lists and other intangible assets in certain food delivery markets, as described in Note 6, Goodwill and Other Intangible Assets, did not meet the definition of a business. The adoption of ASU 2017-01 did not otherwise impact the accompanying consolidated financial statements.

We adopted the guidance in ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (Topic 740), on January 1, 2017. This ASU requires immediate recognition of the income tax consequences of intercompany asset transfers other than inventory. We recorded a $3.2 million cumulative effect adjustment to increase our accumulated deficit as of January 1, 2017 to recognize the impact of that change in accounting policy.

We adopted the guidance in ASU 2015-11, Inventory (Topic 330) - Simplifying the Measurement of Inventory, on January 1, 2017. This ASU requires inventory to be measured at the lower of cost or net realizable value, rather than the lower of cost or market. The adoption of ASU 2015-11 did not have a material impact on the accompanying consolidated financial statements.

We adopted the guidance in ASU 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40) - Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern, as of December 31, 2016. This ASU requires management to assess a company's ability to continue as a going concern and to provide related disclosures in certain circumstances. Based on the results of our analysis, no additional disclosures were required.

We adopted the guidance in ASU 2016-09, Compensation - Stock Compensation (Topic 718) - Improvements to Employee Share-Based Payment Accounting, on January 1, 2016. Under this ASU, entities are permitted to make an accounting policy election to either estimate forfeitures on share-based payment awards, as previously required, or to recognize forfeitures as they occur. We elected to recognize forfeitures as they occur and the impact of that change in accounting policy was recorded as a $3.1 million cumulative effect adjustment to increase accumulated deficit as of January 1, 2016. Additionally, ASU 2016-09 requires that all income tax effects related to settlements of share-based payment awards be reported in earnings as an increase or decrease to provision (benefit) for income taxes. Previously, income tax benefits at settlement of an award were reported as an increase (or decrease) to additional paid-in capital to the extent that those benefits were greater than (or less than) the income tax benefits reported in earnings during the award's vesting period. The requirement to report those income tax effects in earnings was applied on a prospective basis to settlements occurring on or after January 1, 2016. ASU 2016-09 also requires that all income tax-related cash flows resulting from share-based payment awards be reported as operating activities in the consolidated statement of cash flows. Previously, income tax benefits at settlement of an award were reported as a reduction to operating cash flows and an increase to financing cash flows to the extent that those benefits exceeded the income tax benefits reported in earnings during the award's vesting period. The Company elected to apply that change in cash flow classification on a retrospective basis, which resulted in an increase of $7.6 million to net cash provided by operating activities and a corresponding increase to net cash used in financing activities for the year ended December 31, 2015. The remaining provisions of ASU 2016-09 did not have a material impact on the accompanying consolidated financial statements.

We adopted the guidance in ASU 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis, on January 1, 2016. This ASU expands the variable interest entity ("VIE") criteria to specifically include limited partnerships in certain circumstances. The adoption of ASU 2015-02 did not have a material impact on the accompanying consolidated financial statements. We determined that Monster Holdings LP ("Monster LP") is not a VIE under ASU 2015-02, which is consistent with its conclusion prior to adoption of the ASU. That investment is evaluated as a corporation, rather than a limited partnership, for purposes of making consolidation determinations because its governance structure is akin to a corporation. Under the terms of Monster LP’s amended and restated agreement of limited partnership, all of the objectives and purposes of Monster LP are carried out by a board of directors, rather than a general partner.

Reclassifications and Terminology Changes

Certain reclassifications have been made to the consolidated financial statements of prior periods and the accompanying notes to conform to the current period presentation, including the change in presentation of restricted cash in the consolidated statements of cash flows upon adoption of ASU 2016-18 as described above. Additionally, in prior years, we referred to our product revenue and service revenue as "direct revenue" and "third-party and other revenue," respectively. This terminology change did not impact the amounts presented in the consolidated financial statements.

Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires estimates and assumptions that affect the reported amounts and classifications of assets and liabilities, revenue and expenses, and the related disclosures of contingent liabilities in the consolidated financial statements and accompanying notes. Estimates are used for, but not limited to, variable consideration from unredeemed vouchers, income taxes, initial valuation and subsequent impairment testing of goodwill and intangible assets, investments, customer refunds, contingent liabilities and the useful lives of property, equipment and software and intangible assets. Actual results could differ materially from those estimates.

Cash, Cash Equivalents and Restricted Cash

We consider all highly liquid investments with an original maturity of three months or less from the date of purchase to be cash equivalents. Restricted cash represents amounts that we are unable to access for operational purposes. These amounts primarily relate to withholdings from employee paychecks under our employee stock purchase plan ("ESPP").

Accounts Receivable, Net

Accounts receivable primarily represents the net cash due from credit card and other payment processors and from merchants and performance marketing networks for commissions earned on consumer purchases. The carrying amount of receivables is reduced by an allowance for doubtful accounts that reflects management's best estimate of amounts that will not be collected. The allowance is based on historical loss experience and any specific risks identified in collection matters. Accounts receivable are charged off against the allowance for doubtful accounts when it is determined that the receivable is uncollectible.

Inventories

 Inventories, consisting of merchandise purchased for resale, are accounted for using the first-in, first-out method of accounting and are valued at the lower of cost or net realizable value. We write down our inventory to the lower of cost or net realizable value based upon assumptions about future demand and market conditions. If actual market conditions are less favorable than those projected, additional inventory write-downs may be required. Once established, the original cost of the inventory less the related inventory write-down represents a new cost basis.

Property and Equipment

Property and equipment are stated at cost and assets under capital leases are stated at the lesser of the present value of minimum lease payments or their fair market value. Depreciation and amortization of property and equipment is recorded on a straight-line basis over the estimated useful lives of the assets. Generally, the useful lives are three to five years for computer hardware and office equipment, five to ten years for furniture and fixtures and warehouse equipment and the shorter of the term of the lease or the asset’s useful life for leasehold improvements and assets under capital leases.

Internal-Use Software

We incur costs related to internal-use software and website development, including purchased software and internally-developed software. Costs incurred in the planning and evaluation stage of internally-developed software and website development are expensed as incurred. Costs incurred and accumulated during the application development stage are capitalized and included within Property, equipment and software, net on the consolidated balance sheets. Amortization of internal-use software is recorded on a straight-line basis over the two-year estimated useful life of the assets.

Impairment of Long-Lived Assets

Long-lived assets, such as property, equipment and software and intangible assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. If circumstances require that a long-lived asset or asset group to be held and used be tested for possible impairment, we first compare the undiscounted cash flows expected to be generated by that long-lived asset or asset group to its carrying amount. If the carrying amount of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment is recognized to the extent that the carrying amount exceeds its fair value.

Long-lived assets or disposal groups classified as held for sale are recorded at the lower of their carrying amount or fair value less estimated selling costs. Long-lived assets are not depreciated or amortized while classified as held for sale.

Goodwill

Goodwill is allocated to our reporting units at the date the goodwill is initially recorded. Once goodwill has been allocated to the reporting units, it no longer retains its identification with a particular acquisition and becomes identified with the reporting unit in its entirety. Accordingly, the fair value of the reporting unit as a whole is available to support the recoverability of its goodwill.

We evaluate goodwill for impairment annually on October 1 or more frequently when an event occurs or circumstances change that indicates the carrying value may not be recoverable. We have the option to assess goodwill for impairment by first performing a qualitative assessment to determine whether it is more-likely-than-not that the fair value of a reporting unit is less than its carrying amount. If we determine that it is not more-likely-than-not that the fair value of a reporting unit is less than its carrying amount, then the two-step goodwill impairment test is not required to be performed. If we determine that it is more-likely-than-not that the fair value of a reporting unit is less than its carrying amount, or if we do not elect the option to perform an initial qualitative assessment, we perform the two-step goodwill impairment test. In the first step, the fair value of the reporting unit is compared with its book value including goodwill. If the fair value of the reporting unit is in excess of its book value, the related goodwill is not impaired and no further analysis is necessary. If the fair value of the reporting unit is less than its book value, there is an indication of potential impairment and a second step is performed. When required, the second step of testing involves calculating the implied fair value of goodwill for the reporting unit. The implied fair value of goodwill is determined in the same manner as goodwill recognized in a business combination, which is the excess of the fair value of the reporting unit determined in step one over the fair value of its net assets, including identifiable intangible assets, as if the reporting unit had been acquired. If the carrying value of the reporting unit's goodwill exceeds the implied fair value of that goodwill, an impairment loss is recognized in an amount equal to that excess. For reporting units with a negative book value (i.e., excess of liabilities over assets), we evaluate qualitative factors to determine whether it is necessary to perform the second step of the goodwill impairment test.

Investments

Investments in equity shares without a readily determinable fair value and for which we do not have the ability to exercise significant influence are accounted for at cost adjusted for observable price changes and impairments, with changes in the measurement recognized through net income. Those investments are classified within Investments on the consolidated balance sheets.

Investments in common stock or in-substance common stock for which we have the ability to exercise significant influence are accounted for under the equity method, except where we have made an irrevocable election to account for the investments at fair value. Those investments are classified within Investments on the consolidated balance sheets. The proportionate share of income or loss on equity method investments and changes in the fair values of investments for which the fair value option has been elected are presented within Other income (expense), net on the consolidated statements of operations.

Investments in convertible debt securities and convertible redeemable preferred shares are accounted for as available-for-sale securities, which are classified within Investments on the consolidated balance sheets. Available-for-sale securities are recorded at fair value each reporting period. Unrealized gains and losses, net of the related tax effects, are excluded from earnings and recorded as a separate component within Accumulated other comprehensive income on the consolidated balance sheets until realized. Interest income from available-for-sale securities is reported within Other income (expense), net on the consolidated statements of operations.

Other-than-Temporary Impairment of Investments

An unrealized loss exists when the current fair value of an investment is less than its cost basis. We conduct reviews of our investments with unrealized losses on a quarterly basis to evaluate whether those impairments are other-than-temporary. This evaluation, which is performed at the individual investment level, considers qualitative and quantitative factors regarding the severity and duration of the unrealized loss, as well as our intent and ability to hold the investment for a period of time that is sufficient to allow for an anticipated recovery in value. Evidence considered in this evaluation includes the amount of the impairment, the length of time that the investment has been impaired, the factors contributing to the impairment, the financial condition and near-term prospects of the investee, recent operating trends and forecasted performance of the investee, market conditions in the geographic area or industry in which the investee operates and our strategic plans for holding the investment in relation to the period of time expected for an anticipated recovery in value. Additionally, we consider whether we intend to sell the investment or whether it is more likely than not that it will be required to sell the investment before recovery of its amortized cost basis. Investments with unrealized losses that are determined to be other-than-temporary are written down to fair value with a charge to earnings. Unrealized losses that are determined to be temporary in nature are not recorded for equity method investments, while such losses are recorded, net of tax, in accumulated other comprehensive income for available-for-sale securities.

Income Taxes

We account for income taxes using the asset and liability method, under which deferred income tax assets and liabilities are recognized based upon anticipated future tax consequences attributable to differences between the financial statement carrying amounts of assets and liabilities and their respective tax bases. We regularly review deferred tax assets to assess whether it is more likely than not that the deferred tax assets will be realized and, if necessary, establish a valuation allowance for portions of such assets to reduce the carrying value.

For purposes of assessing whether it is more likely than not that deferred tax assets will be realized, we consider the following four sources of taxable income for each tax jurisdiction: (a) future reversals of existing taxable temporary differences, (b) projected future earnings, (c) taxable income in carryback years, to the extent that carrybacks are permitted under the tax laws of the applicable jurisdiction, and (d) tax planning strategies, which represent prudent and feasible actions that a company ordinarily might not take, but would take to prevent an operating loss or tax credit carryforward from expiring unused. To the extent that evidence about one or more of these sources of taxable income is sufficient to support a conclusion that a valuation allowance is not necessary, other sources need not be considered. Otherwise, evidence about each of the sources of taxable income is considered in arriving at a conclusion about the need for and amount of a valuation allowance. See Note 15, Income Taxes, for further information about our valuation allowance assessments.

We are subject to taxation in the United States, various states and foreign jurisdictions. Significant judgment is required in determining the worldwide provision for income taxes and recording the related income tax assets and liabilities. During the ordinary course of business, there are many transactions and calculations for which the ultimate tax determination is uncertain. For example, our effective tax rate could be adversely affected by earnings being lower than anticipated in countries where it has lower statutory rates and higher than anticipated in countries where it has higher statutory rates, by changes in foreign currency exchange rates, by changes in the valuation of deferred tax assets and liabilities, by changes in the measurement of uncertain tax positions or by changes in the relevant laws, regulations, principles and interpretations. We account for uncertainty in income taxes by recognizing the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit. For tax positions meeting the more-likely-than-not criteria, the amount recognized in the consolidated financial statements is the largest benefit that has a greater than 50 percent likelihood of being realized upon ultimate settlement with the relevant tax authority.

Lease and Asset Retirement Obligations

We classify leases at their inception as either operating or capital leases and may receive renewal or expansion options, rent holidays and leasehold improvement or other incentives on certain lease agreements. We recognize operating lease costs on a straight-line basis, taking into account adjustments for escalating payments and lease incentives. Rent expense associated with operating lease obligations is primarily classified within Selling, general and administrative on the consolidated statements of operations. Minimum lease payments made under capital leases are apportioned between interest expense, which is presented within Other income (expense), net on the consolidated statements of operations, and a reduction of the related capital lease obligations, which are classified within Accrued expenses and other current liabilities and Other non-current liabilities on the consolidated balance sheets.

We establish assets and liabilities for the present value of estimated future costs to retire long-lived assets at the termination or expiration of a lease. Such assets are amortized over the lease term, and the recorded liabilities are accreted to the future value of the estimated retirement costs. The related amortization and accretion expenses are presented within Selling, general and administrative on the consolidated statements of operations.

Revenue Recognition

On January 1, 2018, we adopted Topic 606 using the modified retrospective method. Beginning on January 1, 2018, results are presented in accordance with the revised policies, while prior period amounts are not adjusted and continue to be reported in accordance with our historical policies. See Note 13, Revenue Recognition, for additional information.

We recognize revenue when we satisfy a performance obligation by transferring a promised good or service to a customer. Substantially all of our performance obligations are satisfied at a point in time rather than over time.

Service revenue

Service revenue is primarily earned from transactions in which we earn commissions by selling goods or services on behalf of third-party merchants. Those transactions generally involve a customer's purchase of a voucher through one of our online marketplaces that can be redeemed with a third-party merchant for specified goods or services (or for discounts on specified goods or services). Service revenue from those transactions is reported on a net basis as the purchase price collected from the customer less the portion of the purchase price that is payable to the third-party merchant. We recognize revenue from those transactions when our commission has been earned, which occurs when a sale through one of our online marketplaces is completed and the related voucher has been made available to the customer. We believe that our remaining obligations to remit payment to the merchant and to provide information about vouchers sold are administrative activities that are immaterial in the context of the contract with the merchant. Revenue from hotel reservation offerings is recognized at the time the reservation is made, net of an allowance for estimated cancellations.

We also earn commissions when customers make purchases with retailers using digital coupons accessed through our websites and mobile applications and from voucherless merchant offerings in which customers earn cash back on their credit card statements when they transact with third-party merchants. We recognize those commissions as revenue in the period in which the underlying transactions between the customer and the third-party merchant are completed. Additionally, we earn advertising revenue when the advertiser's logo or website link has been included on our websites or in specified email distributions for the requisite period of time as set forth in the agreement with the advertiser.

Product revenue

We generate product revenue from direct sales of merchandise inventory through our Goods category. For product revenue transactions, we are the primary party responsible for providing the good to the customer, we have inventory risk and we have discretion in establishing prices. As such, product revenue is reported on a gross basis as the purchase price received from the customer. Product revenue, including associated shipping revenue, is recognized when title passes to the customer upon delivery of the product.

Variable Consideration for Unredeemed Vouchers

For merchant agreements with redemption payment terms, the merchant is not paid its share of the sale price for a voucher sold through one of our online marketplaces until the customer redeems the related voucher. If the customer does not redeem a voucher with such merchant payment terms, we retain all of the gross billings for that voucher, rather than retaining only our net commission. We estimate the variable consideration from vouchers that will not ultimately be redeemed using our historical voucher redemption experience and recognize that amount as revenue at the time of sale. We only recognize amounts in variable consideration when we believe it is probable that a significant reversal of revenue will not occur in future periods, which requires us to make significant estimates of future redemptions. If actual redemptions differ from our estimates, the effects could be material to the consolidated financial statements. As of December 31, 2018, we constrained $13.7 million in revenue from unredeemed vouchers that we may recognize in future periods when we determine it is probable that a significant amount of that revenue will not be subsequently reversed.

Refunds

Refunds are recorded as a reduction of revenue. The liability for estimated refunds is included within Accrued expenses and other current liabilities on the consolidated balance sheets.

We estimate our refund reserve using historical refund experience by deal category. We assess the trends that could affect our estimates on an ongoing basis and make adjustments to the refund reserve calculations if it appears that changes in circumstances, including changes to our refund policies or general economic conditions, may cause future refunds to differ from our initial estimates. If actual refunds differ from our estimates, the effects could be material to the consolidated financial statements.

Discounts, Customer Credits and Other Consideration Payable to Customers

We provide discount offers to encourage purchases of goods and services through our online marketplaces. We record discounts as a reduction of revenue.

Additionally, we issue credits to customers that can be applied to future purchases through our online marketplaces. Credits are primarily issued as consideration for refunds. To a lesser extent, credits are issued for customer relationship purposes. Credits issued to satisfy refund requests are applied as a reduction to the refunds reserve and customer credits issued for relationship purposes are classified as a reduction of revenue. Breakage income from customer credits that are not expected to be used is estimated and recognized as revenue in proportion to the pattern of redemption for customer credits that are used.

Sales and related taxes

Sales, use, value-added and related taxes that are imposed on specific revenue-generating transactions are presented on a net basis and excluded from revenue.

Costs of Obtaining Contracts

Incremental costs to obtain contracts with third-party merchants, such as sales commissions, are deferred and recognized over the expected period of the merchant arrangement, generally from 12 to 18 months. Those costs are classified within Selling, general and administrative expenses in the consolidated statements of operations.

Cost of Revenue

Cost of revenue is comprised of direct and certain indirect costs incurred to generate revenue. Costs incurred to generate revenue, which include credit card processing fees, editorial costs, compensation expense for technology support personnel who are responsible for maintaining the infrastructure of our websites, amortization of internal-use software relating to customer-facing applications, web hosting and other processing fees are attributed to the cost of service and product revenue in proportion to gross billings during the period. For product revenue transactions, cost of revenue also includes the cost of inventory, shipping and fulfillment costs and inventory markdowns. Fulfillment costs are comprised of third-party logistics provider costs, as well as rent, depreciation, personnel costs and other costs of operating our fulfillment center.

Stock-Based Compensation

We measure stock-based compensation cost at fair value. Expense is generally recognized on a straight-line basis over the service period during which awards are expected to vest, except for awards with both performance conditions and a graded vesting schedule, which are recognized using the accelerated method. We present stock-based compensation expense within the consolidated statements of operations based on the classification of the respective employees' cash compensation. See Note 12, Compensation Arrangements.

Foreign Currency

Balance sheet accounts of our operations outside of the United States are translated from foreign currencies into U.S. dollars at exchange rates as of the consolidated balance sheet dates. Revenue and expenses are translated at average exchange rates during the period. Foreign currency translation adjustments and foreign currency gains and losses on intercompany balances that are of a long-term investment nature are included within Accumulated other comprehensive income on the consolidated balance sheets. Foreign currency gains and losses resulting from transactions that are denominated in currencies other than the entity's functional currency, including foreign currency gains and losses on intercompany balances that are not of a long-term investment nature, are included within Other income (expense), net on the consolidated statements of operations.

Business Combinations

The results of businesses acquired are included in the consolidated financial statements beginning on the respective acquisition dates. The fair value of consideration transferred in business combinations is allocated to the tangible and intangible assets acquired and liabilities assumed at the acquisition date, with the remaining unallocated amount recorded as goodwill. Acquired goodwill represents the premium paid over the fair value of the net tangible and intangible assets acquired. We may pay a premium for a number of reasons, including growing our merchant base and acquiring an assembled workforce. The goodwill from business combinations is generally not deductible for tax purposes.

Recently Issued Accounting Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). This ASU will require the recognition of lease assets and liabilities for operating leases with terms of more than 12 months, in addition to the capital lease assets and liabilities currently recorded on our consolidated balance sheets. Presentation of leases within the consolidated statements of operations and cash flows will be substantially consistent with current accounting guidance. The ASU, which is effective for annual reporting periods beginning after December 15, 2018, and interim periods within those annual periods, will have a material impact on our consolidated balance sheets. We have completed the implementation of a lease accounting system. We plan to adopt the ASU effective January 1, 2019 using the modified retrospective transition method and will not restate comparative periods. The modified retrospective transition method requires the cumulative effect, if any, of initially applying the guidance to be recognized as an adjustment to our accumulated deficit as of that adoption date. We plan to elect the package of practical expedients permitted under the transition guidance within the ASU, which allows us to carry forward prior conclusions about lease identification, classification and initial direct costs for leases entered into prior to adoption of Topic 842. Additionally, we plan to not separate lease and non-lease components for all of our leases. For leases with a term of 12 months or less, we plan to elect the short-term lease exemption, which allows us to not recognize right-of-use assets or lease liabilities for qualifying leases existing at transition and new leases we may enter into in the future. While we continue to assess all impacts of adoption, we currently expect to recognize additional lease liabilities of $100.0 million to $115.0 million representing the present value of the remaining minimum lease payments at January 1, 2019 and corresponding right-of-use assets of the same amount. See Note 10, Commitments and Contingencies, for information about our lease commitments.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses of Financial Instruments. This ASU requires entities to measure credit losses for financial assets measured at amortized cost based on expected losses rather than incurred losses. For available-for-sale debt securities with unrealized losses, entities will be required to recognize credit losses through an allowance for credit losses. The ASU will be effective for annual reporting periods beginning after December 15, 2019 and interim periods within those annual periods. While we are still assessing the impact of ASU 2016-13, we currently believe that the adoption of this guidance will not have a material impact on our consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350) - Simplifying the Test for Goodwill Impairment. This ASU eliminates Step 2 of the goodwill impairment test and requires a goodwill impairment to be measured as the amount by which a reporting unit’s carrying amount exceeds its fair value, not to exceed the carrying amount of its goodwill. The ASU is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019 and early adoption is permitted. We believe that the adoption of this guidance will not have a material impact on our consolidated financial statements.

In June 2018, the FASB issued ASU 2018-07, Compensation - Stock Compensation (Topic 718) - Improvements to Nonemployee Share-Based Payment Accounting. This ASU expands the scope of Topic 718 to make the guidance to share-based payment awards to nonemployees consistent with the guidance for share-based payment awards to employees. The ASU will be effective for annual reporting periods beginning after December 15, 2018 and interim periods within those annual periods. We believe that the adoption of this guidance will not have a material impact on our consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820) - Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This ASU modifies the disclosure requirements in Topic 820, Fair Value Measurement, by removing, modifying, or adding certain disclosures. The ASU will be effective for annual reporting periods beginning after December 15, 2019 and interim periods within those annual periods. Early adoption is permitted, and entities are permitted to early adopt any removed or modified disclosures and delay adoption of the additional disclosures until the effective date. We are still assessing the impact of ASU 2018-13 on our consolidated financial statements.

In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This ASU requires entities in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40, Internal-Use Software, to determine which costs to implement the service contract would be capitalized as an asset related to the service contract and which costs would be expensed. The ASU will be effective for annual reporting periods beginning after December 15, 2019 and interim periods within those annual periods. Early adoption is permitted, including in interim periods. We currently plan to early adopt the guidance on January 1, 2019 and will prospectively apply that guidance to all implementation costs incurred after that adoption date. We may incur substantial costs within the scope of this guidance.

There are no other accounting standards that have been issued but not yet adopted that we believe could have a material impact on our consolidated financial statements.

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DISCONTINUED OPERATIONS AND OTHER BUSINESS DISPOSITIONS

12 Months Ended

Dec. 31, 2018

Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax [Abstract]

DISCONTINUED OPERATIONS AND OTHER BUSINESS DISPOSITIONS

DISCONTINUED OPERATIONS AND OTHER BUSINESS DISPOSITIONS

Discontinued Operations

In October 2016, we completed a strategic review of our international markets in connection with our efforts to optimize our global footprint and focus on the markets that we believe have the greatest potential to benefit our long-term financial performance. Based on that review, we decided to focus our business on 15 core countries and to pursue strategic alternatives for our operations in the remaining 11 countries, which were primarily based in Asia and Latin America. The dispositions of our operations in those 11 countries were completed between November 2016 and March 2017.

A business disposition that represents a strategic shift and has (or will have) a major effect on our operations and financial results is reported as a discontinued operation. We determined that the decision reached by management and our Board of Directors to exit those 11 non-core countries, which comprised a substantial majority of the operations outside of North America and EMEA, represented a strategic shift in our business. Additionally, based on our review of quantitative and qualitative factors relevant to the dispositions, we determined that the disposition of the businesses in those countries would have a major effect on our operations and financial results. As such, the results of operations and cash flows for the operations in those countries, including the gains and losses on the dispositions and related income tax effects, are presented as discontinued operations in the accompanying consolidated financial statements for the years ended December 31, 2017 and 2016.

In connection with our strategic initiative to exit non-core countries as discussed above, we sold an 83% controlling stake in our subsidiary in Israel and sold our subsidiaries in Argentina, Chile, Colombia, Peru, Mexico, Brazil, Singapore and Hong Kong during the first quarter 2017. Additionally, we sold our subsidiary in Malaysia and ceased our operations in South Africa during the fourth quarter 2016. For the years ended December 31, 2017 and 2016, we recognized a net pretax loss of $1.6 million and a net pretax gain of $0.3 million, respectively, on those dispositions, which consisted of the following (in thousands):

	Year Ended December 31,
	2017			2016
Net consideration received:
Fair value of minority investments retained or acquired	$	2,021		$	2,457
Cash proceeds received	3,462			—
Cash proceeds receivable	2,000			—
Less: transaction costs	1,394			190
Total net consideration received	6,089			2,267
Cumulative translation gain (loss) reclassified to earnings	14,718			(1,201		)
Less: Net book value upon closing of the transactions	14,958			754
Less: Indemnification liabilities (1)	5,365			—
Less: Unfavorable contract liability for transition services	2,114			—
Gain (loss) on dispositions	$	(1,630	)	$	312

(1) See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

The following table summarizes the major classes of line items included in loss from discontinued operations, net of tax, for the years ended December 31, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2017 (1) (2)			2016 (1)
Service revenue	$	12,602		$	97,105
Product revenue	2,962			32,634
Service cost of revenue	(2,557		)	(21,697		)
Product cost of revenue	(3,098		)	(31,792		)
Marketing expense	(1,239		)	(10,776		)
Selling, general and administrative expense	(12,007		)	(72,141		)
Restructuring	(778		)	(3,170		)
Other income (expense), net	3,852			(4,818		)
Loss from discontinued operations before gain (loss) on dispositions and provision for income taxes	(263		)	(14,655		)
Gain (loss) on dispositions	(1,630		)	312
Provision for income taxes	(81		)	(2,771		)
Loss from discontinued operations, net of tax	$	(1,974	)	$	(17,114	)

(1) The loss from discontinued operations before gain (loss) on dispositions and provision for income taxes for the years ended December 31, 2017 and 2016 includes the results of each business through its respective disposition date.

(2) Selling, general and administrative expense from discontinued operations for the year ended December 31, 2017 includes increases to contingent liabilities under indemnification agreements. See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

Other Dispositions

During the year ended December 31, 2016, we sold our subsidiaries in Russia and Indonesia, and our point of sale business, Breadcrumb. The consideration received in exchange for Indonesia and Breadcrumb included minority investments in their respective acquirers. We recognized a pretax gain of $11.4 million in connection with those transactions, which is presented within Gains on business dispositions in the accompanying consolidated statements of operations, and consisted of the following (in thousands):

	Year Ended December 31, 2016
Net consideration received:
Fair value of minority investments acquired	$	11,029
Less: transaction costs	849
Total net consideration received	10,180
Cumulative translation gain reclassified to earnings	7,468
Less: Net book value upon closing of the transactions	6,249
Gain on business dispositions	$	11,399

The financial results of the disposed entities are presented within income from continuing operations in the accompanying consolidated financial statements through their respective disposition dates. Those financial results were not material for the year ended December 31, 2016.

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BUSINESS COMBINATIONS

12 Months Ended

Dec. 31, 2018

Business Combinations [Abstract]

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS

We acquired one business during the year ended December 31, 2018 and three businesses during the year ended December 31, 2016. For the years ended December 31, 2018 and 2016, $0.7 million and $1.6 million, of external transaction costs related to business combinations, primarily consisting of legal and advisory fees, are classified within Selling, general and administrative on the consolidated statements of operations. The results of businesses acquired are included in the consolidated financial statements beginning on the respective acquisition dates. Acquired goodwill represents the premium paid over the fair value of the net tangible and intangible assets acquired. We may pay a premium for a number of reasons, including growing our merchant base and acquiring an assembled workforce.

2018 Acquisition Activity

On April 30, 2018, we acquired 80% of the outstanding shares of Cloud Savings Company, Ltd. ("Cloud Savings"), a UK-based business that operates online discount code and digital gift card platforms. The primary purpose of this acquisition was to expand digital coupon offerings in our International segment. The transaction included a contingent consideration arrangement with an acquisition-date fair value of $1.6 million. In additional, concurrent with the acquisition, we entered into an agreement with the noncontrolling shareholder that gave us the right to acquire and the noncontrolling shareholder's right to put to us the remaining outstanding shares of Cloud Savings in December 2018. The acquisition-date fair value of the right and obligation to acquire the remaining outstanding shares of $8.6 million was initially recorded as a financing obligation and classified within Accrued expenses and other current liabilities on the consolidated balance sheets. We paid $8.4 million to exercise that right in December 2018. The aggregate acquisition-date fair value of the consideration transferred for the Cloud Savings acquisition totaled $74.6 million, which consisted of the following (in thousands):

Cash	$	64,363
Financing obligation	8,604
Contingent consideration	1,589
Total	$	74,556

The following table summarizes the allocation of the aggregate acquisition price of the Cloud Savings acquisition (in thousands). The allocation of the acquisition price has been prepared on a preliminary basis, and changes to that allocation may occur as a result of final working capital adjustments and tax return filings.

Cash and cash equivalents	$	6,244
Accounts receivable	5,885
Prepaid expenses and other current assets	804
Property, equipment and software	226
Goodwill	46,515
Intangible assets (1) :
Merchant relationships	20,322
Trade names	2,609
Developed technology	549
Other intangible assets	687
Total assets acquired	$	83,841
Accounts payable	$	693
Accrued merchant and supplier payables	386
Accrued expenses and other current liabilities	6,130
Other non-current liabilities	2,076
Total liabilities assumed	$	9,285
Total acquisition price	$	74,556

(1) The estimated useful lives of the acquired intangible assets are 6 years for merchant relationships, 8 years for trade names, 2 years for developed technology, and 1 year for other intangible assets.

The results of the Cloud Savings acquisition are included in our consolidated financial statements from the date of acquisition through December 31, 2018. The revenue and net income of Cloud Savings included in our consolidated statements of operations were $12.9 million and $1.1 million, for the period from April 30, 2018 through December 31, 2018. Pro forma results of operations for the Cloud Savings acquisition are not presented because the pro forma effects of that acquisition were not material to our consolidated results of operations.

2016 Acquisition Activity

LivingSocial, Inc.

On October 31, 2016, we acquired all of the outstanding equity interests of LivingSocial, Inc. ("LivingSocial"), an e-commerce company that connects merchants to consumers by offering goods and services, generally at a discount. The primary purpose of this acquisition was to grow our customer base. We acquired LivingSocial for no consideration.

The following table summarizes the assets acquired and liabilities assumed from the LivingSocial acquisition (in thousands):

Cash and cash equivalents	$	15,479
Accounts receivable	3,652
Prepaid expenses and other current assets	2,399
Property, equipment and software	1,075
Goodwill	528
Intangible assets: (1)
Customer relationships	16,200
Merchant relationships	2,700
Trade name	1,000
Developed technology	2,500
Other non-current assets	5,495
Total assets acquired	$	51,028
Accounts payable	$	2,184
Accrued merchant and supplier payables	18,498
Accrued expenses and other current liabilities	25,854
Other non-current liabilities	4,492
Total liabilities assumed	$	51,028
Total acquisition price	$	—

(1) The estimated useful lives of the acquired intangible assets are 1 year for developed technology, 4 years for trade name and 3 years for merchant relationships and customer relationships.

The following pro forma information presents the combined operating results for the year ended December 31, 2016 as if we had acquired LivingSocial as of January 1, 2016 (in thousands). The underlying pro forma results include the historical financial results of us and this acquired business adjusted for depreciation and amortization expense associated with the assets acquired. The pro forma results do not reflect any operating efficiencies or potential cost savings which may result from the consolidation of the operations of us and the acquired entity. Accordingly, these pro forma results are not necessarily indicative of what the actual combined results of operations would have been if the acquisition had occurred as of January 1, 2016, nor are they indicative of future results of operations.

	Year Ended December 31, 2016
Revenue	$	3,070,431
Loss from continuing operations	(182,781		)

The revenue and net loss of LivingSocial included in our consolidated statements of operations were $9.3 million and $4.3 million, for the period from October 31, 2016 through December 31, 2016.

Other Acquisitions

We acquired two other businesses during the year ended December 31, 2016. The acquisition price of those businesses and the assets acquired and liabilities assumed were not material.

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PROPERTY, EQUIPMENT AND SOFTWARE, NET

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

PROPERTY, EQUIPMENT AND SOFTWARE, NET

PROPERTY, EQUIPMENT AND SOFTWARE, NET

The following summarizes property, equipment and software, net as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018			2017
Warehouse equipment	$	5,265		$	4,989
Furniture and fixtures	9,677			11,700
Leasehold improvements	50,314			49,605
Office equipment	2,261			2,690
Purchased software	8,523			32,090
Computer hardware (1)	174,700			208,659
Internally-developed software (2)	196,807			249,207
Total property, equipment and software, gross	447,547			558,940
Less: accumulated depreciation and amortization	(304,430		)	(407,795		)
Property, equipment and software, net	$	143,117		$	151,145

(1) Includes computer hardware acquired under capital leases of $120.5 million and $132.3 million as of December 31, 2018 and 2017.

(2) The net carrying amount of internally-developed software was $70.9 million and $64.5 million as of December 31, 2018 and 2017.

As of December 31, 2018, we removed $75.9 million of certain fully depreciated property and equipment and $105.0 million of certain fully amortized internally-developed software from gross property, equipment and software and accumulated depreciation and amortization.

Depreciation and amortization expense on property, equipment and software is classified as follows in the accompanying consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
Service cost of revenue	$	28,102	$	26,738	$	21,277
Product cost of revenue	8,467		9,900		10,616
Selling, general and administrative	64,761		78,157		85,068
Total	$	101,330	$	114,795	$	116,961

The above amounts include amortization of internally-developed software of $53.9 million, $57.0 million and $55.0 million, and amortization expense on assets under capital leases of $30.2 million, $35.2 million and $29.8 million, for the years ended December 31, 2018, 2017 and 2016.

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GOODWILL AND OTHER INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

GOODWILL AND OTHER INTANGIBLE ASSETS

The following table summarizes goodwill activity by segment for the years ended December 31, 2018 and 2017 (in thousands):

	North America		EMEA			Rest of World			International			Consolidated
Balance as of December 31, 2016	$	178,685	$	89,747		$	6,119		$	—		$	274,551
Reallocation to new segment (1)	—		(89,747		)	(6,119		)	95,866			—
Foreign currency translation	—		—			—			12,438			12,438
Balance as of December 31, 2017	$	178,685	$	—		$	—		$	108,304		$	286,989
Goodwill related to acquisition	—		—			—			46,515			46,515
Foreign currency translation	—		—			—			(8,013		)	(8,013		)
Balance as of December 31, 2018	$	178,685	$	—		$	—		$	146,806		$	325,491

(1) We updated our segments in the first quarter of 2017 to report two operating segments: North America and International. Refer to Note 19, Segment Information, for additional information on our change in reporting segments.

We evaluate goodwill for impairment annually on October 1 or more frequently when an event occurs or circumstances change that indicates the carrying value may not be recoverable. There was no goodwill impairment for the years ended December 31, 2018, 2017 and 2016.

The following table summarizes intangible assets as of December 31, 2018 and 2017 (in thousands):

	December 31, 2018						December 31, 2017
	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Customer relationships	$	16,200	$	11,700	$	4,500	$	56,749	$	46,513	$	10,236
Merchant relationships	21,554		4,105		17,449		11,598		9,853		1,745
Trade names	9,476		6,799		2,677		12,077		10,469		1,608
Developed technology	13,825		13,485		340		36,864		36,864		—
Patents	20,508		16,451		4,057		19,031		15,204		3,827
Other intangible assets	26,007		9,629		16,378		10,875		9,095		1,780
Total	$	107,570	$	62,169	$	45,401	$	147,194	$	127,998	$	19,196

As of December 31, 2018, we removed $77.4 million of certain fully amortized intangible assets from gross intangible assets and accumulated amortization.

Amortization of intangible assets is computed using the straight-line method over their estimated useful lives, which range from 1 to 10 years. Amortization expense from continuing operations related to intangible assets was $14.5 million, $23.0 million and $18.9 million for the years ended December 31, 2018, 2017 and 2016. As of December 31, 2018, our estimated future amortization expense related to intangible assets is as follows (in thousands):

2019	$	13,807
2020	7,535
2021	6,811
2022	6,495
2023	5,346
Thereafter	5,407
Total	$	45,401

Sale of Intangible Assets

On September 15, 2017, we sold customer lists and other intangible assets in certain food delivery markets to a subsidiary of Grubhub Inc. ("Grubhub"). We recognized a pretax gain on the sale of assets of $17.1 million, which represents the excess of the $19.8 million in net proceeds received, consisting of $20.0 million in cash less $0.2 million in transaction costs, over the $2.7 million net book value of the assets upon closing of the transaction. See Note 14, Restructuring, for additional information.

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INVESTMENTS

12 Months Ended

Dec. 31, 2018

Schedule of Equity Method Investments [Abstract]

INVESTMENTS

INVESTMENTS

The following table summarizes investments as of December 31, 2018 and 2017 (dollars in thousands):

	December 31, 2018		Percent Ownership of Voting Stock			December 31, 2017		Percent Ownership of Voting Stock
Available-for-sale securities:
Convertible debt securities	$	—				$	11,354
Redeemable preferred shares	10,340		19%	to	25%	15,431		19%	to	25%
Total available-for-sale securities	10,340					26,785
Fair value option investments	73,902		10%	to	19%	82,966		10%	to	19%
Other equity investments (1)	24,273		1%	to	19%	25,438		1%	to	19%
Total investments	$	108,515				$	135,189

(1) Represents equity investments without readily determinable fair values. Those investments were previously accounted for using the cost method of accounting. Under the cost method, investments were carried at cost and adjusted only for other-than-temporary declines in fair value, certain distributions and additional investments. We adopted the guidance in ASU 2016-01 on January 1, 2018. Under that guidance, we have elected to record equity investments without readily determinable fair values at cost adjusted for observable price changes and impairments. There were no adjustments for observable price changes related to these investments for the year ended December 31, 2018. See further discussion under Other Equity Investments below.

Available-for-sale securities

The following table summarizes amortized cost, gross unrealized gain, gross unrealized loss and fair value of available-for-sale securities as of December 31, 2018 and 2017 (in thousands):

	December 31, 2018								December 31, 2017
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value		Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss (1)			Fair Value
Available-for-sale securities:
Convertible debt securities	$	—	$	—	$	—	$	—	$	10,205	$	1,653	$	(504	)	$	11,354
Redeemable preferred shares	9,961		379		—		10,340		15,431		—		—			15,431
Total available-for-sale securities	$	9,961	$	379	$	—	$	10,340	$	25,636	$	1,653	$	(504	)	$	26,785

(1) Gross unrealized loss is related to one security that was in a loss position for greater than 12 months as of December 31, 2017.

In September 2018, we sold an available-for-sale security for total consideration of $8.6 million, which approximated its carrying amount and amortized cost as of the closing date.

We recorded $5.6 million and $2.9 million of other-than-temporary impairments of available-for-sale investments for the years ended December 31, 2018 and 2017, respectively. Those impairments are classified within Other income (expense), net on the consolidated statement of operations.

Fair Value Option Investments    

In connection with the dispositions of controlling stakes in Ticket Monster, an entity based in the Republic of Korea, in May 2015 and Groupon India in August 2015, we obtained minority investments in Monster Holdings LP ("Monster LP") and in Nearbuy Pte Ltd. ("Nearbuy"). We have made an irrevocable election to account for both of those investments at fair value with changes in fair value reported in earnings. We elected to apply fair value accounting to those investments because we believe that fair value is the most relevant measurement attribute for those investments, as well as to reduce operational and accounting complexity. We determined that the fair value of our investments in Monster LP and Nearbuy were $69.4 million and $4.5 million as of December 31, 2018, and $78.9 million and $4.0 million as of December 31, 2017.

The following table summarizes gains and losses due to changes in fair value of those investments for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017		2016
Monster LP	$	(9,509	)	$	249	$	(35,350	)
Nearbuy	445			133		(12,791		)
Total	$	(9,064	)	$	382	$	(48,141	)

Monster LP

In May 2015, we completed the sale of a controlling stake in Ticket Monster to an investor group, whereby (a) the investor group contributed $350.0 million in cash to Monster LP, a newly-formed limited partnership, in exchange for 70,000,000 Class A units of Monster LP and (b) we contributed all of the issued and outstanding share capital of Ticket Monster to Monster LP in exchange for (i) 64,000,000 Class B units of Monster LP and (ii) $285.0 million in cash consideration. Mr. Daniel Shin, the chief executive officer and founder of Ticket Monster, contributed $10.0 million of cash consideration to Monster LP shortly after the closing date in exchange for 2,000,000 Class A units of Monster LP. Additionally, Monster LP was authorized to issue 20,321,839 Class C units to its management, subject to vesting conditions. Under the terms of the Partnership’s amended and restated agreement of limited partnership, its general partner established a Board of Directors and irrevocably assigned the rights to carry out any and all of the objectives and purposes of the partnership to its Board. The general partner is not entitled to receive any distributions.

During the fourth quarter of 2015, the Company sold 2,515,461 Class B units for $4.8 million to Mr. Daniel Shin and other employees of Ticket Monster, which resulted in a gain of $0.1 million.

In January 2016, all 20,321,839 of the authorized Class C units were granted to Monster LP’s employees. Those share-based payment awards are subject to time-based vesting conditions and, for a portion of the Class C units, a performance-based vesting condition.

In December 2016, Monster LP issued a new class of partnership units (Class A-1) to its controlling investor group and a new investor for total proceeds of $65.0 million. The fair value of Monster LP implied by the terms of the $65.0 million equity financing transaction in December 2016 was lower than its estimated fair value in previous periods, which resulted in a significant decrease in the fair value of our investment for the year ended December 31, 2016.

In February 2017, we participated in a recapitalization transaction with Monster LP whereby it exchanged all 61,484,539 of its Class B units for 16,609,195 newly issued Class A-1 units. The Class B units previously held were then distributed from Monster LP to its controlling investor group and certain other existing unit holders. Upon closing of the transaction, we own 57% of the outstanding Class A-1 units, which represents 9% of the total outstanding partnership units.

Following the February 2017 recapitalization transaction, the Class A-1 units are entitled to an $150.0 million liquidation preference, including an $85.0 million liquidation preference attributable to the Class A-1 units held by us, which must be paid prior to any distributions to the holders of the Class A-2, Class B and Class C units. Class A-1 unit holders are also entitled to share in distributions between $950.0 million and $1,494.0 million in accordance with the terms of Monster LP's distribution waterfall and in distributions in excess of $1,494.0 million based on their pro rata ownership of total outstanding partnership units. As a result of the February 2017 recapitalization transaction, we currently hold an investment in the most senior equity units in Monster LP’s capital structure. However, while providing more downside protection, those Class A-1 units provide less opportunity for appreciation than the Class B units previously held by us.

The following tables summarize the condensed financial information for Monster LP as of December 31, 2018 and 2017 and for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017			2016
Revenue	$	416,042		$	280,612		$	216,119
Gross profit	27,838			37,773			24,774
Loss before income taxes	(132,276		)	(124,873		)	(153,882		)
Net loss	(132,276		)	(124,873		)	(153,882		)

	December 31,
	2018		2017
Current assets	$	85,844	$	174,051
Non-current assets	482,505		520,105
Current liabilities	432,133		438,988
Non-current liabilities	78,434		60,977

Nearbuy

In August 2015, Groupon India completed an equity financing transaction with a third-party investor that obtained a majority voting interest in the entity, whereby (a) the investor contributed $17.0 million in cash to Nearbuy, a newly formed Singapore-based entity, in exchange for Series A Preference Shares and (b) we contributed the shares of Groupon India to Nearbuy in exchange for seed preference shares of Nearbuy. In January 2017, Nearbuy issued additional Series A Preference Shares to its controlling investor for total proceeds of $3.0 million. Upon closing of that transaction, the Series A Preference Shares are entitled to a $20.0 million liquidation preference, which must be paid prior to any distributions to other equity holders.

In December 2017, Nearbuy sold its subsidiary Nearbuy India Pte Ltd., which represented substantially all of its business operations, to a third-party investor in exchange for a minority investment in the acquirer.

The following tables summarize the condensed financial information for Nearbuy as of December 31, 2018 and 2017 and for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017		2016
Revenue	$	6,016		$	3,839	$	3,024
Gross profit	5,857			3,405		2,570
Income (loss) before income taxes (1)	(13,594		)	15,122		(15,701		)
Net income (loss) (1)	(13,594		)	15,122		(15,701		)

	December 31,
	2018		2017
Current assets	$	5,286	$	41
Non-current assets	46,940		18,362
Current liabilities	4,015		—
Non-current liabilities	144		—

(1) Nearbuy's income before income taxes and net income for the year ended December 31, 2017 includes a $22.6 million gain from the sale of its subsidiary Nearbuy India Pte Ltd.

Other Equity Investments

In March 2017, in connection with the disposition of Groupon Israel, we retained a minority investment in the entity. The investment was recorded at its $0.4 million fair value at initial recognition and is accounted for as an other equity investment.

In May 2016, we acquired a 13% minority investment in the preferred stock of a restaurant software provider as consideration for the sale of Breadcrumb. The preferred stock was recorded at its $8.3 million acquisition date fair value and was accounted for as an other equity investment. In July 2017, we sold that investment for total consideration of $16.0 million, consisting of $14.7 million received in cash and $1.3 million that the acquirer paid into an escrow account that will be settled within 18 months of closing. We recognized a pretax gain on the disposition of $7.6 million, which is classified within Other income (expense), net on the consolidated statement of operations.

We recorded a $4.6 million impairment of an other equity investment for the year ended December 31, 2018. That impairment is classified within Other income (expense), net on the consolidated statements of operations.

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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION

12 Months Ended

Dec. 31, 2018

Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract]

SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION

SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION

The following table summarizes other income (expense), net for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017			2016
Interest income	$	6,420		$	3,287		$	1,808
Interest expense	(21,909		)	(20,680		)	(15,912		)
Changes in fair value of investments	(9,064		)	382			(48,141		)
Gain on sale of investment	—			7,624			—
Foreign currency gains (losses), net	(20,325		)	18,634			(6,927		)
Impairments of investments	(10,156		)	(2,944		)	—
Other	2,026			407			(2,117		)
Other income (expense), net	$	(53,008	)	$	6,710		$	(71,289	)

The following table summarizes prepaid expenses and other current assets as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Merchandise inventories	$	33,739	$	25,528
Prepaid expenses	28,209		40,399
Income taxes receivable	6,717		10,299
Other	19,450		17,799
Total prepaid expenses and other current assets	$	88,115	$	94,025

The following table summarizes accrued merchant and supplier payables as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Accrued merchant payables	$	371,279	$	459,662
Accrued supplier payables (1)	280,502		310,673
Total accrued merchant and supplier payables	$	651,781	$	770,335

(1) Amounts include payables to suppliers of inventories and providers of shipping and fulfillment services.

The following table summarizes accrued expenses and other current liabilities as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Refund reserve	$	27,957	$	31,275
Compensation and benefits	56,173		73,096
Accrued marketing	39,094		32,912
Customer credits	15,118		28,487
Income taxes payable	8,987		9,645
Deferred revenue	25,452		29,539
Current portion of capital lease obligations	17,207		25,958
Other	77,046		100,284
Total accrued expenses and other current liabilities	$	267,034	$	331,196

The following table summarizes other non-current liabilities as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Contingent income tax liabilities	$	39,858	$	43,699
Deferred rent	32,186		29,032
Capital lease obligations	12,481		18,500
Deferred income taxes	6,619		811
Other	9,544		10,366
Total other non-current liabilities	$	100,688	$	102,408

The following table summarizes the components of accumulated other comprehensive income as of December 31, 2018 and 2017 (in thousands):

	Foreign currency translation adjustments			Unrealized gain (loss) on available-for-sale securities			Pension adjustments			Total
Balance as of December 31, 2015	$	52,261		$	458		$	(1,513	)	$	51,206
Other comprehensive income (loss) before reclassification adjustments	6,579			(70		)	830			7,339
Reclassification adjustments included in net income (loss)	(591		)	—			98			(493		)
Other comprehensive income (loss)	5,988			(70		)	928			6,846
Balance as of December 31, 2016	58,249			388			(585		)	58,052
Other comprehensive income (loss) before reclassification adjustments	(12,382		)	(1,109		)	—			(13,491		)
Reclassification adjustments included in net income (loss)	(14,905		)	1,603			585			(12,717		)
Other comprehensive income (loss)	(27,287		)	494			585			(26,208		)
Balance as of December 31, 2017	30,962			882			—			31,844
Other comprehensive income (loss) before reclassification adjustments	3,332			(841		)	—			2,491
Reclassification adjustments included in net income (loss)	—			106			—			106
Other comprehensive income (loss)	3,332			(735		)	—			2,597
Reclassification for impact of U.S. tax rate change	—			161			—			161
Balance as of December 31, 2018	$	34,294		$	308		$	—		$	34,602

The effects of amounts reclassified from accumulated other comprehensive income to net income (loss) for the years ended December 31, 2018, 2017 and 2016 are presented within the following line items in the consolidated statements of operations (in thousands):

	Year Ended December 31,								Consolidated Statements of Operations Line Item
	2018		2017			2016
Foreign currency translation adjustments
Loss (gain) on dispositions - continuing operations	$	—	$	—		$	(7,468	)	Gains on business dispositions
Loss (gain) on country exits - continuing operations	—		(187		)	(55		)	Other income (expense), net
Loss (gain) on dispositions - discontinued operations	—		(14,718		)	6,932			Income (loss) from discontinued operations, net of tax
Reclassification adjustments	—		(14,905		)	(591		)
Unrealized gain (loss) on available-for-sale securities
Other-than-temporary impairment of available-for-sale security	—		2,944			—			Other income (expense), net
Realized gain on investment	106		(1,341		)	—			Other income (expense), net
Less: Tax effect	—		—			—			Provision (benefit) for income taxes
Reclassification adjustment	106		1,603			—
Pension adjustments
Curtailment gain	—		583			—			Selling, general and administrative
Amortization of net actuarial loss (gain)	—		2			116			Selling, general and administrative
Less: Tax effect	—		—			(18		)	Provision (benefit) for income taxes
Reclassification adjustment	—		585			98
Total reclassification adjustments	$	106	$	(12,717	)	$	(493	)

The following table summarizes other income (expense), net for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017			2016
Interest income	$	6,420		$	3,287		$	1,808
Interest expense	(21,909		)	(20,680		)	(15,912		)
Changes in fair value of investments	(9,064		)	382			(48,141		)
Gain on sale of investment	—			7,624			—
Foreign currency gains (losses), net	(20,325		)	18,634			(6,927		)
Impairments of investments	(10,156		)	(2,944		)	—
Other	2,026			407			(2,117		)
Other income (expense), net	$	(53,008	)	$	6,710		$	(71,289	)

The following table summarizes prepaid expenses and other current assets as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Merchandise inventories	$	33,739	$	25,528
Prepaid expenses	28,209		40,399
Income taxes receivable	6,717		10,299
Other	19,450		17,799
Total prepaid expenses and other current assets	$	88,115	$	94,025

The following table summarizes accrued merchant and supplier payables as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Accrued merchant payables	$	371,279	$	459,662
Accrued supplier payables (1)	280,502		310,673
Total accrued merchant and supplier payables	$	651,781	$	770,335

(1) Amounts include payables to suppliers of inventories and providers of shipping and fulfillment services.

The following table summarizes accrued expenses and other current liabilities as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Refund reserve	$	27,957	$	31,275
Compensation and benefits	56,173		73,096
Accrued marketing	39,094		32,912
Customer credits	15,118		28,487
Income taxes payable	8,987		9,645
Deferred revenue	25,452		29,539
Current portion of capital lease obligations	17,207		25,958
Other	77,046		100,284
Total accrued expenses and other current liabilities	$	267,034	$	331,196

The following table summarizes other non-current liabilities as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Contingent income tax liabilities	$	39,858	$	43,699
Deferred rent	32,186		29,032
Capital lease obligations	12,481		18,500
Deferred income taxes	6,619		811
Other	9,544		10,366
Total other non-current liabilities	$	100,688	$	102,408

The following table summarizes the components of accumulated other comprehensive income as of December 31, 2018 and 2017 (in thousands):

	Foreign currency translation adjustments			Unrealized gain (loss) on available-for-sale securities			Pension adjustments			Total
Balance as of December 31, 2015	$	52,261		$	458		$	(1,513	)	$	51,206
Other comprehensive income (loss) before reclassification adjustments	6,579			(70		)	830			7,339
Reclassification adjustments included in net income (loss)	(591		)	—			98			(493		)
Other comprehensive income (loss)	5,988			(70		)	928			6,846
Balance as of December 31, 2016	58,249			388			(585		)	58,052
Other comprehensive income (loss) before reclassification adjustments	(12,382		)	(1,109		)	—			(13,491		)
Reclassification adjustments included in net income (loss)	(14,905		)	1,603			585			(12,717		)
Other comprehensive income (loss)	(27,287		)	494			585			(26,208		)
Balance as of December 31, 2017	30,962			882			—			31,844
Other comprehensive income (loss) before reclassification adjustments	3,332			(841		)	—			2,491
Reclassification adjustments included in net income (loss)	—			106			—			106
Other comprehensive income (loss)	3,332			(735		)	—			2,597
Reclassification for impact of U.S. tax rate change	—			161			—			161
Balance as of December 31, 2018	$	34,294		$	308		$	—		$	34,602

The effects of amounts reclassified from accumulated other comprehensive income to net income (loss) for the years ended December 31, 2018, 2017 and 2016 are presented within the following line items in the consolidated statements of operations (in thousands):

	Year Ended December 31,								Consolidated Statements of Operations Line Item
	2018		2017			2016
Foreign currency translation adjustments
Loss (gain) on dispositions - continuing operations	$	—	$	—		$	(7,468	)	Gains on business dispositions
Loss (gain) on country exits - continuing operations	—		(187		)	(55		)	Other income (expense), net
Loss (gain) on dispositions - discontinued operations	—		(14,718		)	6,932			Income (loss) from discontinued operations, net of tax
Reclassification adjustments	—		(14,905		)	(591		)
Unrealized gain (loss) on available-for-sale securities
Other-than-temporary impairment of available-for-sale security	—		2,944			—			Other income (expense), net
Realized gain on investment	106		(1,341		)	—			Other income (expense), net
Less: Tax effect	—		—			—			Provision (benefit) for income taxes
Reclassification adjustment	106		1,603			—
Pension adjustments
Curtailment gain	—		583			—			Selling, general and administrative
Amortization of net actuarial loss (gain)	—		2			116			Selling, general and administrative
Less: Tax effect	—		—			(18		)	Provision (benefit) for income taxes
Reclassification adjustment	—		585			98
Total reclassification adjustments	$	106	$	(12,717	)	$	(493	)

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FINANCING ARRANGEMENTS

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

FINANCING ARRANGEMENTS

FINANCING ARRANGEMENTS

Convertible Senior Notes

On April 4, 2016, we issued $250.0 million in aggregate principal amount of convertible senior notes (the "Notes") in a private placement to A-G Holdings, L.P. ("AGH"). Michael Angelakis, the chairman and chief executive officer of Atairos Group, Inc. ("Atairos"), joined our Board of Directors in connection with the issuance of the Notes. Atairos controls the voting power of AGH. The net proceeds from this offering were $243.2 million after deducting issuance costs. The Notes bear interest at a rate of 3.25% per annum, payable annually in arrears on April 1 of each year, beginning on April 1, 2017. The Notes will mature on April 1, 2022, subject to earlier conversion or redemption.

Each $1,000 of principal amount of the Notes initially is convertible into 185.1852 shares of common stock, which is equivalent to an initial conversion price of $5.40 per share, subject to adjustment upon the occurrence of specified events. Upon conversion, we can elect to settle the conversion value in cash, shares of our common stock, or any combination of cash and shares of our common stock. Holders of the Notes may convert their Notes at their option at any time until the close of business on the scheduled trading day immediately preceding the maturity date. In addition, if specified corporate events occur prior to the maturity date, we may be required to increase the conversion rate for holders who elect to convert based on the effective date of such event and the applicable stock price attributable to the event, as set forth in a table contained in the indenture governing the Notes (the "Indenture"). Based on the closing price of the common stock of $3.20 as of December 31, 2018, the if-converted value of the Notes was less than the principal amount.

With certain exceptions, upon a fundamental change (as defined in the Indenture), the holders of the Notes may require us to repurchase all or a portion of their Notes for cash at a purchase price equal to the principal amount plus accrued and unpaid interest. In addition, we may redeem the Notes, at our option, at a purchase price equal to the principal amount plus accrued and unpaid interest on or after April 1, 2020, if the closing sale price of the common stock exceeds 150% of the then-current conversion price for 20 or more trading days in the 30 consecutive trading day period preceding the exercise of this redemption right.

The Notes are senior unsecured obligations that rank equal in right of payment to all senior unsecured indebtedness and rank senior in right of payment to any indebtedness that is contractually subordinated to the Notes.

The Indenture includes customary events of default. If an event of default, as defined in the Indenture, occurs and is continuing, the principal amount of the Notes and any accrued and unpaid interest may be declared immediately due and payable. In the case of bankruptcy or insolvency, the principal amount of the Notes and any accrued and unpaid interest would automatically become immediately due and payable.

We have separated the Notes into their liability and equity components in the accompanying consolidated balance sheets. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated conversion feature. The carrying amount of the equity component, representing the conversion option, was determined by deducting the fair value of the liability component from the principal amount of the Notes. The difference between the principal amount of the Notes and the liability component (the "debt discount") is amortized to interest expense at an effective interest rate of 9.75% over the term of the Notes. The equity component of the Notes is included in additional paid-in capital in the consolidated balance sheets and is not remeasured as long as it continues to meet the conditions for equity classification.

We incurred transaction costs of approximately $6.8 million related to the issuance of the Notes. Those transaction costs were allocated to the liability and equity components in the same manner as the allocation of the proceeds from the Notes. Transaction costs attributable to the liability component of $4.8 million were recorded as a debt discount in the consolidated balance sheet and are being amortized to interest expense over the term of the Notes. Transaction costs attributable to the equity component of $2.0 million were recorded in stockholders' equity as a reduction of the equity component.

The carrying amount of the Notes consisted of the following as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018			2017
Liability component:
Principal amount	$	250,000		$	250,000
Less: debt discount	(48,331		)	(60,247		)
Net carrying amount of liability component	$	201,669		$	189,753
Net carrying amount of equity component	$	67,014		$	67,014

The estimated fair value of the Notes as of December 31, 2018 and 2017was $257.1 million and $285.6 million, and was determined using a lattice model. We classified the fair value of the Notes as a Level 3 measurement due to the lack of observable market data over fair value inputs such as our stock price volatility over the term of the Notes and our cost of debt.

As of December 31, 2018, the remaining term of the Notes is approximately 3 years and 3 months. During the years ended December 31, 2018, 2017 and 2016, we recognized interest costs on the Notes as follows (in thousands):

	Year Ended December 31,
	2018		2017		2016
Contractual interest (3.25% of the principal amount per annum)	$	8,128	$	8,128	$	6,095
Amortization of debt discount	11,916		10,758		7,376
Total	$	20,044	$	18,886	$	13,471

Note Hedges and Warrants

In May 2016, we purchased convertible note hedges with respect to our common stock for a cost of $59.1 million from certain bank counterparties. The convertible note hedges provide us with the right to purchase up to 46.3 million shares of our common stock at an initial strike price of $5.40 per share, which corresponds to the initial conversion price of the Notes, and are exercisable upon conversion of the Notes. The convertible note hedges are intended to reduce the potential economic dilution upon conversion of the Notes. The convertible note hedges are separate transactions and are not part of the terms of the Notes. Holders of the Notes do not have any rights with respect to the convertible note hedges.

In May 2016, we also sold warrants for total cash proceeds of $35.5 million to certain bank counterparties. The warrants provide the counterparties with the right to purchase up to 46.3 million shares of our common stock at a strike price of $8.50 per share. The warrants expire on various dates between July 1, 2022 and August 26, 2022 and are exercisable on their expiration dates. The warrants are separate transactions and are not part of the terms of the Notes or convertible note hedges. Holders of the Notes and convertible note hedges do not have any rights with respect to the warrants.

The amounts paid and received for the convertible note hedges and warrants were recorded in additional paid-in capital in the consolidated balance sheets as of December 31, 2018 and 2017. The convertible note hedges and warrants are not remeasured as long as they continue to meet the conditions for equity classification. The amounts paid for the convertible note hedges are tax deductible over the term of the Notes, while the proceeds received from the warrants are not taxable. 

Under the if-converted method, the shares of common stock underlying the conversion option in the Notes are included in the diluted earnings per share denominator and the interest expense on the Notes, net of tax, is added to the numerator. However, upon conversion, there will be no economic dilution from the Notes, as exercise of the convertible note hedges eliminates any dilution from the Notes that would have otherwise occurred when the price of our common stock exceeds the conversion price. Taken together, the purchase of the convertible note hedges and sale of warrants are intended to offset any actual dilution from the conversion of the Notes and to effectively increase the overall conversion price from $5.40 to $8.50 per share.

Revolving Credit Agreement

The amended and restated senior secured revolving credit agreement entered into in June 2016 (the "Amended and Restated Credit Agreement") provides for aggregate principal borrowings of up to $250.0 million and matures in June 2019. Borrowings under the Amended and Restated Credit Agreement bear interest, at our option, at a rate per annum equal to the Alternate Base Rate or Adjusted LIBO Rate (each as defined in the Amended and Restated Credit Agreement) plus an additional margin ranging between 0.50% and 2.25%. We are required to pay quarterly commitment fees ranging from 0.25% to 0.40% per annum of the average daily amount of unused commitments available under the Amended and Restated Credit Agreement. The Amended and Restated Credit Agreement also provides for the issuance of up to $45.0 million in letters of credit, provided that the sum of outstanding borrowings and letters of credit do not exceed the maximum funding commitment of $250.0 million.

The Amended and Restated Credit Agreement is secured by substantially all of our tangible and intangible assets, including a pledge of 100% of the outstanding capital stock of substantially all of our direct and indirect domestic subsidiaries and 65% of the shares or equity interests of first-tier foreign subsidiaries and each U.S. entity whose assets substantially consist of capital stock and/or intercompany debt of one or more foreign subsidiaries, subject to certain exceptions. Certain of our domestic subsidiaries are guarantors under the Amended and Restated Credit Agreement.

The Amended and Restated Credit Agreement contains various customary restrictive covenants that limit our ability to, among other things: incur additional indebtedness; make dividend and other restricted payments, including share repurchases; enter into sale and leaseback transactions; make investments, loans or advances; grant or incur liens on assets; sell assets; engage in mergers, consolidations, liquidations or dissolutions; and engage in transactions with affiliates. The Amended and Restated Credit Agreement requires us to maintain compliance with specified financial covenants, comprised of a minimum fixed charge coverage ratio, a maximum leverage ratio, a maximum senior secured indebtedness ratio and a minimum liquidity ratio, each as set forth in the Amended and Restated Credit Agreement. We are also required to maintain, as of the last day of each fiscal quarter, unrestricted cash of at least $400.0 million, including $200.0 million in accounts held with lenders under the Amended and Restated Credit Agreement or their affiliates. Non-compliance with these covenants may result in termination of the commitments under the Amended and Restated Credit Agreement and any then outstanding borrowings may be declared due and payable immediately. We have the right to terminate the Amended and Restated Credit Agreement or reduce the available commitments at any time.

As of December 31, 2018 and 2017, we have no borrowings and have outstanding letters of credit of $19.2 million and $22.7 million, under the Amended and Restated Credit Agreement.

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COMMITMENTS AND CONTINGENCIES

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Leases

We have entered into various non-cancelable operating lease agreements for our offices and data centers throughout the world with lease expirations between 2019 and 2026. Rent expense under operating leases was$40.1 million,$42.5 million and $45.4 million for the years ended December 31, 2018, 2017 and 2016. Sublease income was $6.5 million, $7.1 million and $2.7 million for the years ended December 31, 2018, 2017 and 2016.

We lease our headquarters located in Chicago, Illinois ("600 West Chicago"). Our lease agreement for 600 West Chicago extends through January 31, 2026 and includes rent escalations that range from one to two percent per year, as well as expansion options and a five-year renewal option. The 600 West Chicago lease represents $87.5 million of the estimated future payments under operating leases shown in the table below. We account for the 600 West Chicago lease as an operating lease and recognize rent expense on a straight-line basis, taking into account rent escalations and lease incentives.

Certain of our computer hardware has been acquired under capital lease agreements, with expirations between 2019 and 2022.

We are responsible for paying our proportionate share of specified operating expenses and real estate, personal property and lease taxes under certain of our operating and capital leases agreements.

As of December 31, 2018, the future payments under operating leases and capital leases for each of the next five years and thereafter are as follows (in thousands):    

	Capital Leases			Operating Leases
2019	$	18,169		$	32,533
2020	7,634			31,116
2021	4,784			26,876
2022	687			26,097
2023	—			21,944
Thereafter	—			31,633
Total minimum lease payments	31,274			$	170,199
Less: Amount representing interest	(1,586		)
Present value of net minimum capital lease payments	29,688
Less: Current portion of capital lease obligations	(17,207		)
Total long-term capital lease obligations	$	12,481

As of December 31, 2018, the future amounts due under subleases for each of the next five years and thereafter are as follows (in thousands):

	Subleases
2019	$	5,206
2020	5,027
2021	5,065
2022	5,103
2023	4,385
Thereafter	4,891
Total future sublease income	$	29,677

Purchase Obligations

We have entered into non-cancelable arrangements with third-parties, primarily related to cloud computing and other information technology services. As of December 31, 2018, future payments under these contractual obligations were as follows (in thousands):

2019	$	13,266
2020	7,300
2021	3,400
2022	3,400
2023	—
Thereafter	—
Total purchase obligations	$	27,366

Legal Matters and Other Contingencies

From time to time, we are party to various legal proceedings incident to the operation of our business. For example, we currently are involved in proceedings brought by former employees and merchants, intellectual property infringement suits, customer lawsuits, consumer class actions and suits alleging, among other things, violations of state consumer protection or privacy laws. The following is a brief description of significant legal proceedings.

On March 2, 2016, International Business Machines Corporation ("IBM") filed a complaint in the United States District Court for the District of Delaware against us (the "Delaware Action"). In the Delaware Action, IBM alleged that we infringed certain IBM patents that IBM claimed relate to the presentation of applications and advertising in an interactive service, preserving state information in online transactions and single sign-on processes in a computing environment and sought damages (including a request that the amount of compensatory damages be trebled), injunctive relief and costs and reasonable attorneys’ fees. On July 27, 2018, a jury in this matter returned a verdict finding we willfully infringed each of these patents and awarded damages of $82.5 million to IBM.

On May 9, 2016, we filed a complaint in the United States District Court for the Northern District of Illinois against IBM (the "Illinois Action"). We alleged that IBM infringed one of our patents relating to location-based services.

On September 28, 2018, we entered into settlement and license agreements with IBM fully resolving the Delaware Action, the Illinois Action and related proceedings with IBM. The settlement terms provide for the payment of $57.5 million to IBM, a cross-license to the parties’ respective patent portfolios, mutual releases of claims and the dismissal with prejudice of the Delaware Action and the Illinois Action. On October 1, 2018, the court in the Illinois Action entered an order dismissing the Illinois Action with prejudice. On October 2, 2018, the court in the Delaware Action entered an order dismissing the Delaware Action with prejudice.

We allocated the settlement amount between the litigation settlement component and the license for future use of the patented technology based on their relative fair values, which resulted in a $34.6 million charge recorded within Selling, general and administrative expense in our consolidated statements of operations to increase our contingent liability and $15.4 million that was capitalized for the license to use the patented technology in future periods under the terms of the settlement and license agreements.

In addition, other third parties have from time to time claimed, and others may claim in the future, that we have infringed their intellectual property rights. We are subject to intellectual property disputes, including patent infringement claims, and expect that we will continue to be subject to intellectual property infringement claims as our services expand in scope and complexity. In the past, we have litigated such claims, and we are presently involved in several patent infringement and other intellectual property-related claims, including pending litigation or trademark disputes relating to, for example, our Goods category, some of which could involve potentially substantial claims for damages or injunctive relief. We may also become more vulnerable to third-party claims as laws such as the Digital Millennium Copyright Act are interpreted by the courts, and we become subject to laws in jurisdictions where the underlying laws with respect to the potential liability of online intermediaries are either unclear or less favorable. We believe that additional lawsuits alleging that we have violated patent, copyright or trademark laws will be filed against us. Intellectual property claims, whether meritorious or not, are time consuming and often costly to resolve, could require expensive changes in our methods of doing business or the goods we sell, or could require us to enter into costly royalty or licensing agreements.

We also are subject to consumer claims or lawsuits relating to alleged violations of consumer protection or privacy rights and statutes, some of which could involve potentially substantial claims for damages, including statutory or punitive damages. Consumer and privacy related claims or lawsuits, whether meritorious or not, could be time consuming, result in costly litigation, damage awards, fines and penalties, injunctive relief or increased costs of doing business through adverse judgment or settlement, or require us to change our business practices, sometimes in expensive ways.

We are also subject to, or in the future may become subject to, a variety of regulatory inquiries, audits, and investigations across the jurisdictions where we conduct our business, including, for example, inquiries related to consumer protection, employment matters and/or hiring practices, marketing practices, tax, unclaimed property and privacy rules and regulations. Any regulatory actions against us, whether meritorious or not, could be time consuming, result in costly litigation, damage awards, fines and penalties, injunctive relief or increased costs of doing business through adverse judgment or settlement, require us to change our business practices in expensive ways, require significant amounts of management time, result in the diversion of significant operational resources or otherwise harm our business.

We establish an accrued liability for loss contingencies related to legal and regulatory matters when the loss is both probable and reasonably estimable. Those accruals represent management's best estimate of probable losses and, in such cases, there may be an exposure to loss in excess of the amounts accrued. For certain of the matters described above, there are inherent and significant uncertainties based on, among other factors, the stage of the proceedings, developments in the applicable facts of law, or the lack of a specific damage claim. However, we believe that the amount of reasonably possible losses in excess of the amounts accrued for those matters would not have a material adverse effect on our business, consolidated financial position, results of operations or cash flows. Our accrued liabilities for loss contingencies related to legal and regulatory matters may change in the future as a result of new developments, including, but not limited to, the occurrence of new legal matters, changes in the law or regulatory environment, adverse or favorable rulings, newly discovered facts relevant to the matter, or changes in the strategy for the matter. Regardless of the outcome, litigation and other regulatory matters can have an adverse impact on us because of defense and settlement costs, diversion of management resources and other factors.

Indemnifications

In connection with the dispositions of our operations in Latin America (see Note 3, Discontinued Operations and Other Business Dispositions), we agreed to indemnify the buyer for certain tax and other matters. The indemnification liabilities were initially recorded at their fair value, estimated to be $5.4 million using a probability-weighted expected cash flow approach, upon closing of the transactions as an adjustment to the net loss on the dispositions within discontinued operations. We estimate that the total amount of obligations that are reasonably possible to arise under the indemnifications in excess of amounts accrued as of December 31, 2018 is approximately $18.0 million.

In the normal course of business to facilitate transactions related to our operations, we indemnify certain parties, including employees, lessors, service providers, merchants, and counterparties to investment agreements and asset and stock purchase agreements with respect to various matters. We have agreed to hold certain parties harmless against losses arising from a breach of representations or covenants, or other claims made against those parties. These agreements may limit the time within which an indemnification claim can be made and the amount of the claim. We are also subject to increased exposure to various claims as a result of our divestitures and acquisitions, particularly in cases where we are entering into new businesses in connection with such acquisitions. We may also become more vulnerable to claims as we expand the range and scope of our services and are subject to laws in jurisdictions where the underlying laws with respect to potential liability are either unclear or less favorable. In addition, we have entered into indemnification agreements with our officers, directors and underwriters, and our bylaws contain similar indemnification obligations that cover officers, directors, employees and other agents. 

Except as noted above, it is not possible to determine the maximum potential amount under these indemnification agreements due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. Historically, any payments that we have made under these agreements have not had a material impact on the operating results, financial position or cash flows.

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STOCKHOLDERS' EQUITY

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

STOCKHOLDERS' EQUITY

STOCKHOLDERS' EQUITY

Preferred Stock

Our Board of Directors (the "Board") has the authority, without approval by the stockholders, to issue up to a total of 50,000,000 shares of preferred stock in one or more series. The Board may establish the number of shares to be included in each such series and may fix the designations, preferences, powers and other rights of the shares of a series of preferred stock. The Board could authorize the issuance of preferred stock with voting or conversion rights that could dilute the voting power or rights of the holders of our common stock. As of December 31, 2018 and 2017, there were no shares of preferred stock outstanding.

Common Stock

Prior to October 31, 2016, our certificate of incorporation, as amended and restated, authorized three classes of common stock: Class A common stock, Class B common stock and common stock. On October 31, 2016, each share of our Class A common stock and Class B common stock automatically converted into a single class of common stock pursuant to the terms of our sixth amended and restated certificate of incorporation. Upon conversion, all shares of Class A common stock and Class B common stock were retired.

Pursuant to our restated certificate of incorporation, the Board has the authority to issue up to a total of 2,010,000,000 shares of common stock. Each holder of common stock shall be entitled to one vote for each such share on any matter that is submitted to a vote of stockholders. In addition, holders of the common stock will vote as a single class of stock on any matter that is submitted to a vote of stockholders.

Prior to October 31, 2016, holders of Class A common stock and Class B common stock had identical rights, except that holders of Class A common stock were entitled to one vote per share and holders of Class B common stock were entitled to 150 votes per share.

Share Repurchase Program

In May 2018, the Board authorized us to repurchase up to $300.0 million of our common stock under a new share repurchase program. The prior share repurchase program, which authorized repurchases up to $700.0 million, expired in April 2018. During the year ended December 31, 2018, we repurchased 3,252,886 shares for an aggregate purchase price of $10.0 million (including fees and commissions) under the new repurchase program. No amounts were repurchased under the prior share repurchase program during the year ended December 31, 2018. As of December 31, 2018, up to $290.0 million of common stock remained available for purchase under the new program. The timing and amount of share repurchases, if any, will be determined based on market conditions, limitations under the Amended and Restated Credit Agreement, share price and other factors, and the share repurchase program may be terminated at any time.

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COMPENSATION ARRANGEMENTS

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

COMPENSATION ARRANGEMENTS

COMPENSATION ARRANGEMENTS

Groupon, Inc. Stock Plans

In January 2008, we adopted the 2008 Stock Option Plan, as amended (the "2008 Plan"), under which options for up to 64,618,500 shares of common stock were authorized to be issued to employees, consultants and directors. The 2008 Plan was frozen in December 2010. In April 2010, we established the Groupon, Inc. 2010 Stock Plan, as amended in April 2011 (the "2010 Plan"), under which options and restricted stock units ("RSUs") for up to 20,000,000 shares of common stock were authorized for future issuance to employees, consultants and directors. No new awards may be granted under the 2010 Plan following our initial public offering in November 2011. In August 2011,we established the Groupon, Inc. 2011 Stock Plan (the "2011 Plan"), as amended in November 2013, May 2014 and June 2016, under which options, RSUs and performance stock units for up to 150,000,000 shares of common stock were authorized for future issuance to employees, consultants and directors.

The Groupon, Inc. Stock Plans described above (the "Plans") are administered by the Compensation Committee of the Board (the "Compensation Committee"). As of December 31, 2018, 54,927,088 shares of common stock were available for future issuance under the Plans.

The stock-based compensation expense related to stock awards issued under the Plans and acquisition-related awards are presented within the following line items of the consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
Cost of revenue	$	1,485	$	2,658	$	3,940
Marketing	6,948		7,949		8,929
Selling, general and administrative	56,288		70,343		96,654
Restructuring charges	—		849		4,749
Other income (expense), net	100		245		851
Total stock-based compensation expense	$	64,821	$	82,044	$	115,123

We recognized stock-based compensation from discontinued operations of $0.2 million and $3.1 million for the years ended December 31, 2017 and 2016. We also capitalized $7.4 million, $6.2 million, and $9.3 million of stock-based compensation for the years ended December 31, 2018, 2017 and 2016, in connection with internally-developed software. As of December 31, 2018, $95.2 million of unrecognized compensation costs related to unvested employee stock awards are expected to be recognized over a remaining weighted-average period of 1.35 years.

Employee Stock Purchase Plan

We are authorized to grant up to 10,000,000 shares of common stock under our employee stock purchase plan. For the years ended December 31, 2018, 2017 and 2016, 1,621,061, 1,879,656 and 1,669,782 shares of common stock were issued under the ESPP.

Restricted Stock Units

The restricted stock units granted under the Plans generally have vesting periods between one and four years and are amortized on a straight-line basis over their requisite service period. Additionally, we are required to issue restricted stock units to settle amounts that exceed targeted bonus amounts under our primary bonus plans. We account for those obligations as a liability-classified award with performance conditions. The table below summarizes restricted stock unit activity under the Plans for the year ended December 31, 2018:

	Restricted Stock Units			Weighted- Average Grant Date Fair Value (per share)
Unvested at December 31, 2017	$	28,939,110		$	4.32
Granted	19,376,465			4.59
Vested	(15,226,639		)	4.46
Forfeited	(6,465,504		)	4.31
Unvested at December 31, 2018	$	26,623,432		$	4.47

The weighted-average grant date fair value of restricted stock units granted in 2017 and 2016 was $4.10 and $3.93. The fair value of restricted stock units that vested during each of the three years ended December 31, 2018, 2017 and 2016 was $64.1 million, $67.0 million and $88.2 million.

Performance Share Units

The performance share units granted under the Plans vest in shares of our common stock upon the achievement of financial and operational targets specified in the respective award. The awards are subject to both continued employment through the performance period dictated by the award and certification by the Compensation Committee that the specified financial and operational targets have been achieved.

During the year ended December 31, 2018, we granted performance share units for which the maximum number of common shares issuable upon vesting was 7,972,780 shares and the weighted-average grant date fair value was $4.88 per unit. Based on our financial and operational results for the year ended December 31, 2018, 1,261,730 shares with a total grant date fair value of $6.2 million became issuable upon vesting of the performance share units following the Compensation Committee's approval in February 2019.

During the year ended December 31, 2018, 278,635 shares of our common stock were issued related to performance share units granted in the previous year following the Compensation Committee's certification of the financial and operational metrics for the year ended December 31, 2017. The weighted-average grant date fair value of those units was $3.78 per share. The fair value of the performance share units that vested during the year ended December 31, 2018 was $1.3 million.

Restricted Stock Awards

We previously granted restricted stock awards in connection with business combinations. Compensation expense on those awards was recognized on a straight-line basis over the requisite service periods of the awards. During the year ended December 31, 2017, 1.2 million restricted shares with a fair value of $5.2 million vested. The fair value of restricted stock that vested during the year ended December 31, 2016 was $2.2 million. There were no restricted shares outstanding as of December 31, 2017.

Stock Options

The exercise price of stock options granted is equal to the fair value of the underlying stock on the date of grant. The contractual term for stock options expires ten years from the grant date. Stock options generally vested over a three- or four-year period, with 25% of the awards vesting after one year and the remainder of the awards vesting on a monthly or quarterly basis thereafter.

The table below summarizes the stock option activity for the year ended December 31, 2018:

	Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands) (1)
Outstanding and exercisable at December 31, 2017	$	885,580		$	0.62	1.76	$	3,967
Exercised	(672,793		)	0.12
Forfeited	—			—
Outstanding and exercisable at December 31, 2018	$	212,787		1.80		1.37	$	298

(1) The aggregate intrinsic value of options outstanding and exercisable represents the total pretax intrinsic value (the difference between the fair value of our stock on the last day of each period and the exercise price, multiplied by the number of options where the fair value exceeds the exercise price) that would have been received by the option holders had all option holders exercised their options as of December 31, 2018 and 2017, respectively.

We did not grant any stock options during the years ended December 31, 2018, 2017 and 2016. The total intrinsic value of options that were exercised during the years ended December 31, 2018, 2017 and 2016 was $3.2 million, $4.0 million and $1.2 million.

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REVENUE RECOGNITION

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

REVENUE RECOGNITION

REVENUE RECOGNITION

Product and service revenue are generated from sales transactions through our online marketplaces in three primary categories: Local, Goods and Travel.

Product revenue is earned from direct sales of merchandise inventory to customers and includes any related shipping fees. Service revenue primarily represents the net commissions earned from selling goods and services provided by third-party merchants. Those marketplace transactions generally involve the online delivery of a voucher that can be redeemed by the purchaser with the third-party merchant for goods or services (or for discounts on goods or services). To a lesser extent, service revenue also includes commissions earned when customers make purchases with retailers using digital coupons accessed through our websites and mobile applications. Additionally, in the United States we have recently been developing and testing voucherless offerings that are linked to customer credit cards. Customers claim those voucherless merchant offerings through our online marketplaces and earn cash back on their credit card statements when they transact with the related merchants, who pay us commissions for such transactions.

In connection with most of our product and service revenue transactions, we collect cash from credit card payment processors shortly after a sale occurs. For transactions in which we earn commissions when customers make purchases with retailers using digital coupons accessed through our websites and mobile applications, we generally collect payment from affiliate networks on terms ranging from 30 to 150 days.

As discussed in Note 2, Summary of Significant Accounting Policies, we previously referred to our product revenue and service revenue as "direct revenue" and "third-party and other revenue," respectively.

Adoption of ASC Topic 606, Revenue from Contracts with Customers

On January 1, 2018, we adopted Accounting Standards Codification Topic 606 using the modified retrospective method. Beginning on January 1, 2018, results are presented in accordance with the revised policies, while prior period amounts are not adjusted and continue to be reported in accordance with our historical policies. The adoption of Topic 606 did not significantly impact our presentation of revenue on a gross or net basis. The following changes resulted from the adoption of Topic 606:

• For merchant agreements with redemption payment terms, the merchant is not paid its share of the sale price for a voucher sold through one of our online marketplaces until the customer redeems the related voucher. If the customer does not redeem a voucher with such merchant payment terms, we retain all of the gross billings for that voucher, rather than retaining only our net commission. Prior to our adoption of Topic 606, we recognized that variable consideration from unredeemed vouchers and derecognized the related accrued merchant payables when our legal obligation to the merchant expired, which we believe is shortly after the voucher expiration date in most jurisdictions. Following our adoption of Topic 606, we estimate the variable consideration from vouchers that will not ultimately be redeemed and recognize that amount as revenue at the time of sale, rather than when our legal obligation expires. We estimate variable consideration from unredeemed vouchers using our historical voucher redemption experience. Most vouchers sold through the marketplace in the United States do not have expiration dates and redemption payment terms were not widely used in that jurisdiction before 2017, so the North America segment did not have variable consideration from unredeemed vouchers in prior periods.

• Prior to our adoption of Topic 606, we expensed the incremental costs to obtain contracts with third-party merchants, such as sales commissions, as incurred. Following our adoption of Topic 606, those costs are deferred and recognized over the expected period of the merchant arrangement, generally from12to18months.As of December 31, 2018, we had $2.9 million and $11.3 million of deferred contract acquisition costs recorded within Prepaid expenses and other current assets and Other non-current assets, respectively. For the year ended December 31, 2018, we amortized $25.2 million of deferred contract acquisition costs and did not recognize any impairment losses in relation to the deferred costs.

• Prior to our adoption of Topic 606, we recognized breakage income for unused customer credits when they expired or were forfeited. Following our adoption of Topic 606, breakage income from customer credits that are not expected to be used is estimated and recognized as revenue in proportion to the pattern of redemption for customer credits that are used.

• Prior to our adoption of Topic 606, we deferred the revenue from hotel reservation offerings until the customer's stay commenced. Following our adoption of Topic 606, revenue from hotel reservation offerings is recognized at the time the reservation is made, net of an allowance for estimated cancellations.

• Prior to our adoption of Topic 606, we classified refunds on service revenue transactions for which the merchant's share of the refund amount is not recoverable as a cost of revenue. Following our adoption of Topic 606, those refunds are classified as a reduction of revenue.

• Prior to our adoption of Topic 606, we classified credits issued to consumers for relationship purposes as a marketing expense. Following our adoption of Topic 606, those credits are classified as a reduction of revenue.

We recorded a net reduction to our opening accumulated deficit of $88.9 million, which is net of a $6.7 million income tax effect, as of January 1, 2018 due to the cumulative impact of adopting Topic 606. The following table summarizes balance sheet accounts impacted by the cumulative effect of adopting Topic 606 (in thousands):

Account	Increase (decrease) to beginning accumulated deficit
Prepaid expenses and other current assets	$	(4,007	)
Other non-current assets	(10,223		)
Accrued merchant and supplier payables	(64,970		)
Accrued expenses and other current liabilities	(13,188		)
Other non-current liabilities	3,443
Effect on beginning accumulated deficit	$	(88,945	)

See Note 2,Summary of Significant Accounting Policies, for additional information about our revenue recognition policies after the adoption of Topic 606.

Impacts on Consolidated Financial Statements

The following tables summarize the impacts of adopting Topic 606 on our consolidated financial statements as of and for the year ended December 31, 2018 (in thousands):

Consolidated Balance Sheet

	December 31, 2018
	As reported		Effects of Topic 606			Balances without adoption of Topic 606
Total assets	$	1,642,142	$	(10,948	)	$	1,631,194
Total liabilities	1,259,531		103,878			1,363,409
Total equity	382,611		(114,826		)	267,785

Consolidated Statements of Operations

	Year Ended December 31, 2018
	As reported			Effects of Topic 606			Balances without adoption of Topic 606
Revenue:
Service revenue (1)	$	1,205,487		$	522		$	1,206,009
Product revenue	1,431,259			—			1,431,259
Total revenue	2,636,746			522			2,637,268
Cost of revenue:
Service cost of revenue (2)	120,077			25,436			145,513
Product cost of revenue	1,196,068			—			1,196,068
Cost of revenue (2)	1,316,145			25,436			1,341,581
Gross profit	1,320,601			(24,914		)	1,295,687
Operating expenses:
Marketing (3)	395,737			7,867			403,604
Selling, general and administrative (4)	870,961			(3,092		)	867,869
Restructuring charges	(136		)	—			(136		)
Total operating expenses	1,266,562			4,775			1,271,337
Income (loss) from operations	54,039			(29,689		)	24,350
Other income (expense), net	(53,008		)	—			(53,008		)
Income (loss) before provision (benefit) for income taxes	1,031			(29,689		)	(28,658		)
Provision (benefit) for income taxes (5)	(957		)	(803		)	(1,760		)
Net income (loss)	$	1,988		$	(28,886	)	$	(26,898	)

(1) For the year ended December 31, 2018, the adoption of Topic 606 resulted in a $33.3 million decrease to Revenue for refunds on service revenue transactions for which the merchant's share is not recoverable and customer credits issued for relationship purposes, partially offset by increases of $27.2 million related to the timing of recognition of variable consideration from unredeemed vouchers, $2.6 million related to the timing of recognition of revenue from hotel reservation offerings and $3.0 million related to the timing of recognition of breakage revenue from customer credits that are not expected to be used.

(2) Reflects decreases to Cost of revenue following the adoption of Topic 606 for refunds on service revenue transactions for which the merchant's share is not recoverable.

(3) Reflects decreases to Marketing expense following the adoption of Topic 606 for customer credits issued for relationship purposes.

(4) Reflects increases to Selling, general and administrative expense for the amortization of deferred contract acquisition costs in excess of amounts capitalized.

(5) As discussed in Note 15, Income Taxes, for the year ended December 31, 2018, we recognized an income tax benefit of $6.4 million resulting from the impact of adopting Topic 606 on intercompany activity in certain foreign jurisdictions. That income tax benefit is not reflected in this table, which presents the direct impacts of adopting Topic 606.

Segment and Category Information

	Year Ended December 31, 2018
	As reported		Effects of Topic 606			Balances without adoption of Topic 606
North America
Service revenue:
Local	$	752,863	$	(1,050	)	$	751,813
Travel	71,856		(1,460		)	70,396
Goods	18,283		113			18,396
Product revenue - Goods	796,393		—			796,393
Total North America revenue	1,639,395		(2,397		)	1,636,998
International
Service revenue:
Local	306,700		2,286			308,986
Travel	41,183		(262		)	40,921
Goods	14,602		895			15,497
Product revenue - Goods	634,866		—			634,866
Total International revenue	997,351		2,919			1,000,270
Consolidated
Service revenue:
Local	1,059,563		1,236			1,060,799
Travel	113,039		(1,722		)	111,317
Goods	32,885		1,008			33,893
Product revenue - Goods	1,431,259		—			1,431,259
Total Consolidated Revenue	$	2,636,746	$	522		$	2,637,268

Contract Balances

A substantial majority of our deferred revenue relates to product sales for which revenue will be recognized as the products are delivered to customers, generally within one week following the balance sheet date. Our deferred revenue was $25.8 million and $25.5 million as of January 1, 2018 and December 31, 2018. The amount of revenue recognized for the year ended December 31, 2018 that was included in the deferred revenue balance at the beginning of the period was $25.1 million.

The following table summarizes the activity in the liability for customer credits for the year ended December 31, 2018 (in thousands):

	Customer Credits
Balance as of January 1, 2018	$	19,414
Credits issued	126,874
Credits redeemed (1)	(112,161		)
Breakage revenue recognized	(18,802		)
Foreign currency translation	(207		)
Balance as of December 31, 2018	$	15,118

(1) Customer credits can be redeemed through our online marketplaces for goods or services provided by a third-party merchant or for merchandise inventory sold by us. When customer credits are redeemed for goods or services provided by a third-party merchant, service revenue is recognized on a net basis as the difference between the carrying amount of the customer credit liability derecognized and the amount due to the merchant for the related transaction. When customer credits are redeemed for merchandise inventory sold by us, product revenue is recognized on a gross basis equal to the amount of the customer credit liability derecognized. Customer credits are primarily used within one year of issuance.

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RESTRUCTURING

12 Months Ended

Dec. 31, 2018

Restructuring and Related Activities [Abstract]

RESTRUCTURING

RESTRUCTURING

In September 2015, we commenced a restructuring plan relating primarily to workforce reductions in our international operations. We have also undertaken workforce reductions in our North America segment. In addition to workforce reductions in our ongoing markets, we ceased operations in 17 countries within our International segment as part of the restructuring plan between September 2015 and March 2016. Those country exits, which generally comprised our smallest international markets, resulted from a series of separate decisions made at different times during that period that were not part of an overall strategic shift. Costs related to the restructuring plan are classified as Restructuring charges on the consolidated statements of operations. The actions under our restructuring plan were completed as of September 30, 2017 and substantially all of the cash payments for actions under that plan were disbursed as of December 31, 2018.

During the third quarter of 2017, we reached a decision to cease most of our food delivery operations and entered into a long-term commercial agreement with a subsidiary of Grubhub that will allow us to provide customers with the ability to order food delivery through our websites and mobile applications in the United States from Grubhub's network of restaurant merchants. See Note 6, Goodwill and Other Intangible Assets, for additional information. For the year ended December 31, 2017, our restructuring costs associated with ceasing those food delivery operations were $2.6 million, primarily related to employee severance. Additionally, we entered into an agreement to sell customer lists and other intangible assets in certain food delivery markets to Grubhub.

We incurred cumulative costs for employee severance and benefits and other exit costs of $80.1 million under the plan since its inception in September 2015. In addition to those costs, we incurred cumulative long-lived asset impairment charges of $7.5 million resulting from our restructuring activities. The amounts presented in Restructuring charges for the year ended December 31, 2018 reflect changes in estimates related to prior actions.

The following tables summarize costs incurred by segment related to the restructuring plan for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31, 2018
	Employee Severance and Benefit Costs			Asset Impairments		Other Exit Costs		Total Restructuring Charges
North America	$	—		$	—	$	177	$	177
International	(353		)	—		40		(313		)
Consolidated	$	(353	)	$	—	$	217	$	(136	)

	Year Ended December 31, 2017
	Employee Severance and Benefit Costs (1)		Asset Impairments		Other Exit Costs		Total Restructuring Charges
North America	$	8,172	$	—	$	3,826	$	11,998
International	4,814		—		2,016		6,830
Consolidated	$	12,986	$	—	$	5,842	$	18,828

	Year Ended December 31, 2016
	Employee Severance and Benefit Costs (1)		Asset Impairments (2)		Other Exit Costs		Total Restructuring Charges
North America	$	8,548	$	45	$	3,304	$	11,897
International	25,499		283		2,759		28,541
Consolidated	$	34,047	$	328	$	6,063	$	40,438

(1) The employee severance and benefit costs for the years ended December 31, 2017 and 2016 related to the termination of approximately 750 and 900 employees.

(2) Asset impairments related to property, equipment and software that were determined to be impaired as a result of our restructuring activities.

The following table summarizes restructuring liability activity for the years ended December 31, 2018 and 2017 (in thousands):

	Employee Severance and Benefit Costs			Other Exit Costs			Total
Balance as of December 31, 2016	$	14,135		$	2,260		$	16,395
Charges payable in cash (1)	12,140			5,842			17,982
Cash payments	(23,117		)	(7,826		)	(30,943		)
Foreign currency translation	659			28			687
Balance as of December 31, 2017	$	3,817		$	304		$	4,121
Charges payable in cash	(353		)	217			(136		)
Cash payments	(2,256		)	(521		)	(2,777		)
Foreign currency translation	(89		)	—			(89		)
Balance as of December 31, 2018	$	1,119		$	—		$	1,119

(1) Excludes stock-based compensation of $0.8 million related to accelerated vesting of stock-based compensation awards for certain employees terminated as a result of our restructuring activities.

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INCOME TAXES

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The components of pretax income (loss) from continuing operations for the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):

	Year Ended December 31,
	2018			2017		2016
United States	$	23,349		$	30,095	$	(119,095	)
International	(22,318		)	6,050		(52,432		)
Income (loss) before provision (benefit) for income taxes	$	1,031		$	36,145	$	(171,527	)

The provision (benefit) for income taxes for the years ended December 31, 2018, 2017 and 2016 was allocated between continuing operations and discontinued operations as follows (in thousands):

	Year Ended December 31,
	2018			2017		2016
Continuing Operations	$	(957	)	$	7,544	$	(5,318	)
Discontinued Operations	—			—		2,771
Total	$	(957	)	$	7,544	$	(2,547	)

The provision (benefit) for income taxes from continuing operations for the years ended December 31, 2018, 2017 and 2016 consisted of the following components (in thousands):

	Year Ended December 31,
	2018			2017			2016
Current taxes:
U.S. federal	$	768		$	(120	)	$	(1,093	)
State	57			191			912
International	3,218			6,870			5,311
Total current taxes	4,043			6,941			5,130
Deferred taxes:
U.S. federal	(319		)	(1,335		)	(4,262		)
State	—			50			(11		)
International	(4,681		)	1,888			(6,175		)
Total deferred taxes	(5,000		)	603			(10,448		)
Provision (benefit) for income taxes	$	(957	)	$	7,544		$	(5,318	)

The items accounting for differences between the income tax provision (benefit) from continuing operations computed at the U.S. federal statutory rate and the provision (benefit) for income taxes for the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):

	Year Ended December 31,
	2018			2017			2016
U.S. federal income tax provision (benefit) at statutory rate	$	216		$	12,651		$	(60,035	)
Foreign income and losses taxed at different rates (1)	2,113			4,524			9,410
State income taxes, net of federal benefits, and state tax credits	1,966			(4,980		)	(4,694		)
Change in valuation allowances	3,829			(36,057		)	13,797
Effect of income tax rate changes on deferred items (2)	1,544			20,466			7,135
Tax effects of intercompany transactions	607			3,332			853
Adjustments related to uncertain tax positions	18			1,824			(4,899		)
Non-deductible stock-based compensation expense	3,239			5,002			6,724
Tax shortfalls on stock-based compensation awards	(335		)	4,290			12,585
Non-deductible (or non-taxable) change in fair value of investment	—			—			4,484
Federal research and development credits	(8,331		)	(7,862		)	(8,547		)
Forgiveness of intercompany liabilities	(1,340		)	(2,494		)	15,187
Deductions for investments in subsidiaries that have ceased operations	—			—			(645		)
Ordinary stock loss	(11,815		)	—			—
Non-taxable gains on business dispositions	—			—			(3,481		)
Non-deductible or non-taxable items	7,332			6,848			6,808
Provision (benefit) for income taxes	$	(957	)	$	7,544		$	(5,318	)

(1) Tax rates in foreign jurisdictions were generally lower than the U.S. federal statutory rate through December 31, 2018. This results in an adverse impact to the provision (benefit) for income taxes in this rate reconciliation for the years ended December 31, 2018, 2017 and 2016, prior to the impact of valuation allowances, due to the net pretax losses from continuing operations in certain foreign jurisdictions with lower tax rates.

(2) The effect of income tax rate changes on deferred items for the year ended December 31, 2017 is primarily related to the U.S. tax reform legislation that was signed into law on December 22, 2017, which included a reduction of the U.S. Federal income tax rate to 21 percent. That rate reduction did not impact the Company's provision for income taxes for the year ended December 31, 2017 due to the valuation allowance against the Company's U.S. net deferred tax assets.

The deferred income tax assets and liabilities consisted of the following components as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018			2017
Deferred tax assets:
Accrued expenses and other liabilities	$	25,694		$	36,786
Stock-based compensation	5,167			3,720
Net operating loss and tax credit carryforwards	206,328			208,040
Intangible assets, net	16,482			23,722
Investments	5,916			814
Unrealized foreign currency exchange losses	1,882			2,771
Other	1,021			687
Total deferred tax assets	262,490			276,540
Less: Valuation allowances	(228,023		)	(238,702		)
Deferred tax assets, net of valuation allowance	34,467			37,838
Deferred tax liabilities:
Prepaid expenses and other assets	(12,737		)	(10,011		)
Property, equipment and software, net	(12,576		)	(11,315		)
Convertible senior notes	(2,457		)	(2,773		)
Deferred revenue	(7,255		)	(10,436		)
Total deferred tax liabilities	(35,025		)	(34,535		)
Net deferred tax asset (liability)	$	(558	)	$	3,303

We have incurred significant losses in recent periods and had an accumulated deficit of $1,010.5 million as of December 31, 2018. As a result, we maintained valuation allowances against our domestic deferred tax assets and substantially all of our foreign deferred tax assets as of December 31, 2018 and 2017 to reduce their carrying values to amounts that are realizable either through future reversals of existing taxable temporary differences or through taxable income in carryback years for the applicable jurisdictions.

We had $233.1 million of federal and $1,057.5 million of state net operating loss carryforwards as of December 31, 2018, which will begin expiring in 2027 and 2019. As of December 31, 2018, we had $462.2 million of foreign net operating loss carryforwards, a significant portion of which carry forward for an indefinite period.

We are subject to taxation in the United States, state jurisdictions and foreign jurisdictions. Significant judgment is required in determining the worldwide provision for income taxes and recording the related income tax assets and liabilities. We recognize the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit. For tax positions meeting the more-likely-than-not criterion, the amount recognized in the financial statements is the largest benefit that has a greater than 50 percent likelihood of being realized upon ultimate settlement with the relevant tax authority.

The following table summarizes activity related to our gross unrecognized tax benefits, excluding interest and penalties, for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017			2016
Beginning Balance	$	87,359		$	80,081		$	79,637
Increases related to prior year tax positions	1,500			960			1,708
Decreases related to prior year tax positions	(21		)	(1,196		)	(3,154		)
Increases related to current year tax positions	7,533			9,571			11,443
Decreases based on settlements with taxing authorities	—			—			(3,176		)
Decreases due to lapse of statute limitations	(9,447		)	(3,777		)	(4,906		)
Foreign currency translation	713			1,720			(1,471		)
Ending Balance	$	87,637		$	87,359		$	80,081

The total amount of unrecognized tax benefits as of December 31, 2018, 2017 and 2016 that, if recognized, would affect the effective tax rate are $33.3 million, $37.6 million and $34.5 million, respectively.

We recognized $1.6 million, $0.2 million and $1.2 million of interest and penalties within Provision (benefit) for income taxes on our consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016. Total accrued interest and penalties as of December 31, 2018, 2017 and 2016 were $5.4 million, $4.8 million and $4.6 million, and are included within Other non-current liabilities in our consolidated balance sheets.

We are currently under IRS audit for the 2013 and 2014 tax years. Additionally, we are currently under audit by several foreign jurisdictions. It is likely that the examination phase of some of those audits will conclude in the next 12 months. There are many factors, including factors outside of our control, which influence the progress and completion of those audits. We recognized income tax benefits of $7.9 million, $3.0 million and $8.4 million for the years ended December 31, 2018, 2017 and 2016, as a result of new information that impacted our estimates of the amounts that are more-likely-than not of being realized upon settlement of the related tax positions and due to expirations of the applicable statutes of limitations. We are subject to claims for tax assessments by foreign jurisdictions, including a proposed assessment for $109.6 million. We believe that the assessment, which primarily relates to transfer pricing on transactions occurring in 2011, is without merit and we intend to vigorously defend ourselves in that matter. In addition to any potential increases in our liabilities for uncertain tax positions from the ultimate resolution of that assessment, we believe that it is reasonably possible that reductions of up to $49.7 million in unrecognized tax benefits may occur within the 12 months following December 31, 2018 upon closing of income tax audits or the expiration of applicable statutes of limitations.

The Jobs Act was signed into law on December 22, 2017. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118 ("SAB 118") to address the application of U.S. GAAP to situations in which an entity does not have the necessary information available, prepared or analyzed in reasonable detail to complete the accounting for certain income tax effects of the Jobs Act. That guidance specifies that, for income tax effects of the Jobs Act that can be reasonably estimated but for which the accounting and measurement analysis is not yet complete, entities should report provisional amounts in the reporting period that includes the enactment date and those provisional amounts can be adjusted for a measurement period not to exceed one year from the enactment date. Additionally, for income tax effects of the Jobs Act that cannot be reasonably estimated, entities should report provisional amounts for those income tax effects in the first reporting period in which a reasonable estimate can be determined, not to exceed one year from the enactment date.

We previously made provisional estimates for the impact of the Jobs Act as of and for the year ended December 31, 2017 related to the re-measurement of deferred income taxes, valuation allowances, uncertain tax positions, and our assessment of permanently reinvested earnings. Additionally, while we did not expect to incur the deemed repatriation tax established by the Jobs Act due to the aggregate cumulative losses of our foreign operations, we had not previously finalized the related calculations. As of December 31, 2018, we have completed our accounting and measurement analyses related to the income tax effects of the Jobs Act and no significant adjustments to the provisional amounts were recorded during the year ended December 31, 2018.

The Jobs Act also establishes global intangible low-taxed income ("GILTI") provisions that impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. Our accounting policy for the income tax effects of GILTI will be to recognize those taxes as expenses in the period incurred.

In general, it is our practice and intention to reinvest the earnings of our non-U.S. subsidiaries in those operations. Additionally, while we did not incur the deemed repatriation tax established by the Jobs Act, an actual repatriation from our non-U.S. subsidiaries could be subject to foreign and U.S. state income taxes. Aside from limited exceptions for which the related deferred tax liabilities recognized as of December 31, 2018 and 2017 are immaterial, we do not intend to distribute earnings of foreign subsidiaries for which we have an excess of the financial reporting basis over the tax basis of our investments and therefore have not recorded any deferred taxes related to such amounts. The actual tax cost resulting from a distribution would depend on income tax laws and circumstances at the time of distribution. Determination of the amount of unrecognized deferred tax liability related to the excess of the financial reporting basis over the tax basis of our foreign subsidiaries is not practical due to the complexities associated with the calculation.

On July 24, 2018, the Ninth Circuit Court of Appeals issued an opinion in Altera Corp. v. Commissioner requiring related parties in an intercompany cost-sharing arrangement to share expenses related to stock-based compensation. This opinion reversed an earlier decision of the United States Tax Court. On August 7, 2018, the Ninth Circuit Court of Appeals withdrew its July 24, 2018 opinion. We are continuing to monitor the status of the case; however, we currently do not expect that it will have a material impact on our provision for income taxes for the year ending December 31, 2019 due to the valuation allowances against our net deferred tax assets in the related jurisdictions.

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VARIABLE INTEREST ENTITY

12 Months Ended

Dec. 31, 2018

Variable Interest Entity [Abstract]

VARIABLE INTEREST ENTITY

VARIABLE INTEREST ENTITY

Variable interest entities ("VIEs") are entities that have either a total equity investment that is insufficient to permit the entity to finance its activities without additional subordinated financial support, or whose equity investors lack the characteristics of a controlling financial interest (i.e., the ability to make significant decisions through voting rights and the right to receive the expected residual returns of the entity or the obligation to absorb the expected losses of the entity). A variable interest holder that has both (a) the power to direct the activities of the VIE that most significantly impact its economic performance and (b) either an obligation to absorb losses or a right to receive benefits that could potentially be significant to the VIE is referred to as the primary beneficiary and must consolidate the VIE.

In 2011, we entered into an arrangement with a strategic partner to offer deals related to live events, and a limited liability company ("LLC") was established to administer that arrangement. Groupon and the strategic partner each own 50% of the outstanding LLC interests and income and cash flows of the LLC are allocated based on agreed upon percentages specified in the related LLC agreement.

Our obligations associated with our interests in the LLC are primarily administering transactions, contributing intellectual property, identifying deals and promoting the sale of deal offerings, coordinating the distribution of deal offerings and providing the record keeping.

Under the LLC agreement, as amended, the LLC shall be dissolved upon the occurrence of any of the following events: (1) either party becoming a majority owner; (2) July 11, 2019; (3) certain elections of Groupon or the strategic partner based on the operational performance of the LLC or other changes to certain terms in the agreement; (4) election of either Groupon or the strategic partner in the event of bankruptcy by the other party; (5) sale of the LLC; or (6) a court's dissolution of the LLC. We intend to negotiate an extension to this agreement.

We have determined that the LLC is a VIE and that we are its primary beneficiary. We consolidate the LLC because we have the power to direct the activities of the LLC that most significantly impact the LLC's economic performance. In particular, we identify and promote the deal offerings, provide all of the operational and back office support, present the LLC's deal offerings via our websites and mobile applications and provide the editorial resources that create the verbiage for the related deal offers.

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FAIR VALUE MEASUREMENTS

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

Fair value is defined under U.S. GAAP as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is a market-based measurement that is determined based on assumptions that market participants would use in pricing an asset or a liability.

To increase the comparability of fair value measures, the following hierarchy prioritizes the inputs in valuation methodologies used to measure fair value:

Level 1 - Measurements that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.

Level 2 - Measurements that include other inputs that are directly or indirectly observable in the marketplace.

Level 3 - Measurements derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. These fair value measurements require significant judgment.

In determining fair value, we use various valuation approaches within the fair value measurement framework. The valuation methodologies used for our assets and liabilities measured at fair value and their classification in the valuation hierarchy are summarized below:

Cash equivalents. Cash equivalents primarily consisted of AAA-rated money market funds. We classified cash equivalents as Level 1 due to the short-term nature of these instruments and measured the fair value based on quoted prices in active markets for identical assets.

Fair value option investments and available-for-sale securities. To determine the fair value of our fair value option investments each period, we first estimate the fair value of each entity in its entirety. We primarily use the discounted cash flow method, which is an income approach, to estimate the fair value of the investees. The key inputs to determining fair values under that approach are cash flow forecasts and discount rates. As of December 31, 2018 and 2017, we applied discount rates of 21% and 22%, in our discounted cash flow valuations for Monster LP. We also use a market approach valuation technique, which is based on market multiples of guideline companies, to determine the fair value of each entity. The discounted cash flow and market multiple valuations are then evaluated and weighted to determine the amount that is most representative of the fair value of each entity. Once we determine the fair value of each entity, we then determine the fair value of our specific investments in those entities. The entities have complex capital structures, so we apply an option-pricing model that considers the liquidation preferences of each investee’s respective classes of ownership interests to determine the fair value of our investment in each entity.

We also have investments in redeemable preferred shares and had investments in convertible debt securities issued by nonpublic entities. We measure the fair value of those available-for-sale securities using the discounted cash flow method.

We have classified our fair value option investments and our investments in available-for-sale securities as Level 3 due to the lack of observable market data over fair value inputs such as cash flow projections and discount rates. Increases in projected cash flows and decreases in discount rates contribute to increases in the estimated fair values of the fair value option investments and available-for-sale securities, whereas decreases in projected cash flows and increases in discount rates contribute to decreases in their fair values.

Contingent consideration. We are subject to a contingent consideration arrangement to transfer a maximum payout in cash of $2.5 million to the former owners of a business acquired on April 30, 2018. See Note 4, Business Combinations, for further discussion of that acquisition. Additionally, we had contingent obligations in prior periods to transfer cash to the former owners of a previous business acquisition if specified financial results were met (i.e. an earnout).

Liabilities for contingent consideration are measured at fair value each reporting period, with the acquisition-date fair value included as part of the consideration transferred in the related business combination and subsequent changes in fair value recorded in earnings within Selling, general and administrative expense on the consolidated statements of operations.

We use an income approach to value contingent consideration obligations based on the present value of probability-weighted future cash flows. We classify the contingent consideration liabilities as Level 3 due to the lack of relevant observable market data over fair value inputs such as probability-weighting of payment outcomes.

The following tables summarize assets that are measured at fair value on a recurring basis as of December 31, 2018 and 2017 (in thousands):

			Fair Value Measurement at Reporting Date Using
	December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Fair value option investments	$	73,902	$	—	$	—	$	73,902
Available-for-sale securities:
Redeemable preferred shares	10,340		—		—		10,340
Liabilities:
Contingent consideration	1,529		—		—		1,529

			Fair Value Measurement at Reporting Date Using
	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents	$	137,975	$	137,975	$	—	$	—
Fair value option investments	82,966		—		—		82,966
Available-for-sale securities:
Convertible debt securities	11,354		—		—		11,354
Redeemable preferred shares	15,431		—		—		15,431

The following table provides a roll-forward of the fair value of recurring Level 3 fair value measurements for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017			2016
Assets
Fair value option investments:
Beginning Balance	$	82,966		$	82,584		$	130,725
Total gains (losses) included in earnings	(9,064		)	382			(48,141		)
Ending Balance	$	73,902		$	82,966		$	82,584
Unrealized (losses) gains still held (1)	$	(9,064	)	$	382		$	(48,141	)
Available-for-sale securities
Convertible debt securities:
Beginning Balance	$	11,354		$	10,038		$	10,116
Purchases and acquisition of convertible debt securities	—			1,612			—
Proceeds from sales and maturities of convertible debt securities	(8,594		)	(1,843		)	(1,685		)
Transfer to other equity method investment upon conversion of convertible debt security	(4,008		)	—			—
Total gains (losses) included in other comprehensive income (loss)	(1,148		)	(437		)	703
Total gains (losses) included in earnings(2)	2,396			1,984			904
Ending Balance	$	—		$	11,354		$	10,038
Unrealized gains (losses) still held (1)	$	—		$	1,303		$	1,607
Redeemable preferred shares:
Beginning Balance	$	15,431		$	17,444		$	22,834
Total gains (losses) included in other comprehensive income (loss)	379			931			(816		)
Other-than-temporary impairment included in earnings	(5,470		)	(2,944		)	—
Transfer to cost method investment classification upon elimination of redemption feature	—			—			(4,574		)
Ending Balance	$	10,340		$	15,431		$	17,444
Unrealized gains (losses) still held (1)	$	(5,091	)	$	(2,013	)	$	(816	)
Liabilities
Contingent Consideration:
Beginning Balance	$	—		$	14,588		$	10,781
Issuance of contingent consideration in connection with acquisitions	1,589			—			—
Settlements of contingent consideration liabilities	—			(7,858		)	—
Reclass to non-fair value liabilities when no longer contingent	—			(6,778		)	(285		)
Total losses (gains) included in earnings	56			48			4,092
Foreign currency translation	(116		)	—			—
Ending Balance	$	1,529		$	—		$	14,588
Unrealized losses (gains) still held (1)	$	56		$	—		$	3,966

(1) Represents the unrealized gains or losses recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.

(2) Represents a gain at maturity of a previously impaired convertible debt security, accretion of interest income and changes in the fair value of an embedded derivative.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

Certain assets and liabilities are measured at fair value on a nonrecurring basis, including assets that are written down to fair value as a result of an impairment. For the year ended December 31, 2018, we recorded a $4.6 million impairment of an other equity investment. To determine the fair value of the investment, we considered the financial condition of the investee and applied a market approach. We have classified the fair value measurement of that other equity investment as Level 3 because it involves significant unobservable inputs. For the year ended December 31, 2016, we recorded a $0.3 million impairment charge related to property, equipment and software as a result of our restructuring activities (refer to Note 14, Restructuring). Those long lived assets were written down to their estimated fair values of zero as of December 31, 2016.

Estimated Fair Value of Financial Assets and Liabilities Not Measured at Fair Value

The following table presents the carrying amount and fair value of equity securities that were classified as cost method investments as of December 31, 2017 (in thousands):

	December 31, 2017
	Carrying Amount		Fair Value
Cost method investments (1)	$	25,438	$	32,792

(1) See Note 2, Summary of Significant Accounting Policies, and Note 7, Investments, for information about our adoption of ASU 2016-01 on January 1, 2018 and its impact on accounting for equity investments without readily determinable fair values that were previously subject to the cost method of accounting.

The fair values of our cost method investments were determined using the market approach or the income approach, depending on the availability of fair value inputs such as financial projections for the investees and market multiples for comparable companies. We classified the fair value measurements of our cost method investments as Level 3 measurements within the fair value hierarchy as of December 31, 2017 because they involve significant unobservable inputs such as cash flow projections and discount rates.

Our other financial instruments not carried at fair value consist primarily of accounts receivable, restricted cash, accounts payable, accrued merchant and supplier payables and accrued expenses. The carrying values of those assets and liabilities approximate their respective fair values as of December 31, 2018 and 2017 due to their short-term nature.

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INCOME (LOSS) PER SHARE

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

INCOME (LOSS) PER SHARE

INCOME (LOSS) PER SHARE

Basic net income (loss) per share is computed using the weighted-average number of common shares outstanding during the period. Diluted net income (loss) per share is computed using the weighted-average number of common shares and the effect of potentially dilutive securities outstanding during the period. Potentially dilutive securities include stock options, restricted stock units, performance share units, performance bonus awards, ESPP shares, warrants and convertible senior notes. If dilutive, those potentially dilutive securities are reflected in diluted net income (loss) per share by application of the treasury stock method, except for the convertible senior notes, which are subject to the if-converted method.

Each share of our Class A and Class B common stock automatically converted into a single class of common stock on October 31, 2016. Refer to Note 11, Stockholders' Equity, for additional information. Prior to the conversion, we computed net income (loss) per share of Class A and Class B common stock using the two class method. Under the two-class method, the undistributed earnings for each period were allocated based on the contractual participation rights of the Class A and Class B common shares as if the earnings for the period had been distributed. As the liquidation and dividend rights were identical for Class A and Class B common shares, the undistributed earnings were allocated on a proportionate basis. Under the two-class method, the computation of diluted net income (loss) per share of Class A common stock would reflect the conversion of Class B common stock, if dilutive, while the computation of diluted net income (loss) per share of Class B common stock would not reflect the conversion of those shares.

The following table sets forth the computation of basic and diluted net income (loss) per share of common stock for the years ended December 31, 2018 and 2017 (in thousands, except share amounts and per share amounts):

	Year Ended December 31,
	2018			2017
Basic and diluted net income (loss) per share:
Numerator
Net income (loss) - continuing operations	$	1,988		$	28,601
Less: Net income (loss) attributable to noncontrolling interests	13,067			12,587
Net income (loss) attributable to common stockholders - continuing operations	$	(11,079	)	$	16,014
Net income (loss) attributable to common stockholders - discontinued operations	—			(1,974		)
Net income (loss) attributable to common stockholders	$	(11,079	)	$	14,040
Denominator
Shares used in computation of basic net income (loss) per share	566,511,108			559,367,075
Weighted-average effect of diluted securities:
Stock Options	—			842,047
Restricted Stock	—			488,773
Restricted Stock Units	—			7,153,674
Employee Stock Purchase Plan	—			201,504
Performance Share Units and Performance Bonus Awards	—			365,298
Shares used in computation of diluted net income (loss) per share	566,511,108			568,418,371
Basic net income (loss) per share:
Continuing operations	$	(0.02	)	$	0.03
Discontinued operations	0.00			(0.00		)
Basic net income (loss) per share	$	(0.02	)	$	0.03
Diluted net income (loss) per share:
Continuing operations	$	(0.02	)	$	0.03
Discontinued operations	0.00			(0.01		)
Diluted net income (loss) per share	$	(0.02	)	$	0.02

The following table sets forth the computation of basic and diluted loss per share of the common stock and the Class A and Class B common stock for the year ended December 31, 2016 (in thousands, except share amounts and per share amounts):

	Period from January 1, 2016 through October 31, 2016 (pre-conversion)						Period from November 1, 2016 through December 31, 2016 (post-conversion)			Year Ended December 31, 2016 (2)
	Class A			Class B			Common			Total
Basic and diluted net income (loss) per share:
Numerator
Allocation of net income (loss) - continuing operations	$	(151,284	)	$	(632	)	$	(14,293	)	$	(166,209	)
Less: Allocation of net income (loss) attributable to noncontrolling interests	9,559			40			1,665			11,264
Allocation of net income (loss) attributable to common stockholders - continuing operations	$	(160,843	)	$	(672	)	$	(15,958	)	$	(177,473	)
Allocation of net income (loss) attributable to common stockholders - discontinued operations	(7,152		)	(30		)	(9,932		)	(17,114		)
Allocation of net income (loss) attributable to common stockholders	$	(167,995	)	$	(702	)	$	(25,890	)	$	(194,587	)
Denominator
Weighted-average common shares outstanding	574,755,214			2,399,976			574,884,987			576,354,258
Basic and diluted net income (loss) per share (1):
Continuing operations	$	(0.28	)	$	(0.28	)	$	(0.03	)	$	(0.31	)
Discontinued operations	(0.01		)	(0.01		)	(0.02		)	(0.03		)
Basic and diluted net income (loss) per share	$	(0.29	)	$	(0.29	)	$	(0.05	)	$	(0.34	)

(1) The potentially dilutive impacts of a conversion of Class B to Class A shares, outstanding equity awards, warrants and convertible senior notes have been excluded from the calculation of dilutive net income (loss) per share for the years ended December 31, 2016 as their effect on net income (loss) per share from continuing operations was antidilutive.

(2) The shares of Class A and Class B common stock had equal dividend rights and converted into shares of common stock on a one-for-one basis on October 31, 2016. This full year column reflects the weighted average Class A and Class B common shares outstanding for the period from January 1, 2016 through the October 31, 2016 conversion date and the weighted average common shares outstanding for the period from November 1, 2016 through December 31, 2016 in the denominator of the basic and diluted loss per share calculations for the year ended December 31, 2016.

The following weighted-average potentially dilutive instruments are not included in the diluted net income (loss) per share calculations above because they would have had an antidilutive effect on the net income (loss) per share from continuing operations:

	Year Ended December 31,
	2018	2017	2016
Restricted stock units	30,552,028	8,087,545	33,480,458
Other stock-based compensation awards	2,041,099	13,000	3,850,389
Convertible senior notes	46,296,300	46,296,300	34,213,474
Warrants	46,296,300	46,296,300	29,761,907
Total	125,185,727	100,693,145	101,306,228

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SEGMENT INFORMATION

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

The segment information reported in the tables below reflects the operating results that are regularly reviewed by our chief operating decision maker to assess performance and make resource allocation decisions. Prior to the first quarter 2017, we organized our operations into three operating segments: North America, EMEA and Rest of World. As a result of the dispositions discussed in Note 3, Discontinued Operations and Other Business Dispositions, which represented a substantial majority of our international operations outside of EMEA and resulted in changes to our internal reporting and leadership structure, we updated our segments in the first quarter of 2017 to report two operating segments: North America and International. Our operating segments continue to be the same as our reportable segments. In addition, we changed our measure of segment profitability in the first quarter of 2017. Historically, segment operating results reflected operating income (loss) excluding stock-based compensation and acquisition-related expense (benefit), net. In connection with the internal reporting changes in the first quarter of 2017, the measure of segment profitability has been changed to operating income (loss), unadjusted. Prior period segment information has been retrospectively adjusted to reflect those changes.

The following table summarizes revenue by reportable segment and category for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
North America
Service revenue:
Local	$	752,863	$	825,579	$	762,314
Travel	71,856		78,495		82,577
Goods	18,283		16,768		9,068
Product revenue - Goods	796,393		993,326		1,297,810
Total North America revenue (1)	1,639,395		1,914,168		2,151,769
International
Service revenue:
Local	306,700		281,466		270,045
Travel	41,183		43,786		49,756
Goods	14,602		20,358		32,681
Product revenue - Goods	634,866		584,099		509,364
Total International revenue (1)	$	997,351	$	929,709	$	861,846

(1) North America includes revenue from the United States of $1,600.2 million, $1,884.7 million and $2,120.3 million for the years ended December 31, 2018, 2017 and 2016. International includes revenue from the United Kingdom of $390.4 million, $343.9 million and $321.9 million for the years ended December 31, 2018,2017 and 2016. There were no other individual countries that represented more than 10% of consolidated total revenue for the years ended December 31, 2018, 2017 and 2016. Revenue is attributed to individual countries based on the location of the customer. In prior periods, revenue was attributed to individual countries based on the domicile of the legal entities within our consolidated group that undertook those transactions. Beginning in the second quarter of 2017, we updated our attribution of revenue by country to be based on the location of the customer. Prior period revenue amounts by country have been retrospectively adjusted to reflect that change in attribution.

The following table summarizes gross profit by reportable segment and category for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
North America
Service gross profit:
Local	$	671,352	$	708,573	$	660,983
Travel	57,945		60,594		64,355
Goods	15,302		12,929		7,470
Product gross profit - Goods	146,085		145,582		152,739
Total North America gross profit	890,684		927,678		885,547
International
Service gross profit:
Local	289,427		265,348		250,435
Travel	38,132		40,288		45,191
Goods	13,252		17,910		27,976
Product gross profit - Goods	89,106		82,637		71,504
Total International gross profit	$	429,917	$	406,183	$	395,106

The following table summarizes operating income by reportable segment for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017			2016
Operating income (loss) (1) (2) (3) (4) :
North America	$	19,909	$	(45	)	$	(85,423	)
International	34,130		29,480			(14,815		)
Total operating income (loss)	$	54,039	$	29,435		$	(100,238	)

(1) Includes stock-based compensation of $59.7 million, $76.1 million and $104.7 million for North America and $5.0 million, $5.7 million and $9.5 million for International for the years ended December 31, 2018, 2017 and 2016, respectively.

(2) Includes acquisition-related (benefit) expense, net of $0.7 million for International for the year ended December 31, 2018 and $5.7 million for North America for the year ended December 31, 2016.

(3) Includes restructuring charges for North America and International. See Note 14, Restructuring, for restructuring charges by segment.

(4) Includes a $34.6 million charge related to the IBM patent litigation matter for North America for the year ended December 31, 2018. See Note 10, Commitments and Contingencies, for additional information.

The following table summarizes total assets by reportable segment as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Total assets:
North America (1)	$	958,412	$	1,045,072
International (1)	683,730		632,433
Consolidated total assets	$	1,642,142	$	1,677,505

(1) North America contains assets from the United States of $940.5 million and $1,006.2 million as of December 31, 2018 and 2017. International contains assets from Ireland of $204.6 million and $219.7 million as of December 31, 2018 and 2017. There were no other individual countries that represented more than 10% of consolidated total assets as of December 31, 2018 and 2017.

The following table summarizes tangible property and equipment, net of accumulated depreciation and amortization, by reportable segment as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
North America (1)	$	51,032	$	63,402
International (2)	20,773		21,850
Consolidated total	$	71,805	$	85,252

(1) Substantially all tangible property and equipment within North America is located in the United States.

(2) Tangible property and equipment, net located within Ireland represented approximately 12% of our consolidated tangible property and equipment, net as of December 31, 2017. There were no other individual countries located outside of the United States that represented more than 10% of consolidated tangible property and equipment, net as of December 31, 2018 and 2017.

The following table summarizes depreciation and amortization of property, equipment and software and intangible assets by reportable segment for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
North America	$	101,419	$	121,616	$	116,865
International	14,409		16,211		19,044
Consolidated total	$	115,828	$	137,827	$	135,909

The following table summarizes expenditures for additions to tangible long-lived assets by reportable segment for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
North America	$	6,194	$	5,917	$	9,770
International	10,393		5,106		5,255
Consolidated total	$	16,587	$	11,023	$	15,025

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RELATED PARTY TRANSACTION

12 Months Ended

Dec. 31, 2018

Related Party Transactions [Abstract]

RELATED PARTY TRANSACTION

RELATED PARTY TRANSACTION

On December 28, 2016, we entered into a sublease for portions of our office space in Chicago, Illinois to Uptake, Inc. ("Uptake"), a Lightbank LLC ("Lightbank") portfolio company. Eric Lefkofsky, our Chairman of the Board, is a co-founder and owns a significant equity interest in Lightbank. The sublease was negotiated on an arm’s-length basis and is a market rate transaction on terms that we believe are no less favorable than would have been reached with an unrelated third party. The sublease extends through January 31, 2026 and the sublease rentals over that term total approximately $18.2 million. Pursuant to our related party transaction policy, our Audit Committee approved us entering into the sublease. For the years ended December 31, 2018 and 2017, we recognized $2.1 million and $1.9 million, in income from the sublease.

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QUARTERLY RESULTS (UNAUDITED)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

QUARTERLY RESULTS (UNAUDITED)

QUARTERLY RESULTS (UNAUDITED)

The following table represents data from our unaudited consolidated statements of operations for the most recent eight quarters. This quarterly information has been prepared on the same basis as the consolidated financial statements and includes all normal recurring adjustments necessary to fairly state the information for the periods presented. The results of operations of any quarter are not necessarily indicative of the results that may be expected for any future period (in thousands, except share and per share amounts).

	Quarter Ended
	Dec. 31,		Sept. 30,		June 30,			Mar. 31,			Dec. 31,			Sept. 30,			June 30,			Mar. 31,
	2018		2018 (2)		2018 (2)			2018			2017			2017			2017			2017
Consolidated Statements of Operations Data:
Revenue	$	799,927	$	592,883	$	617,396		$	626,540		$	873,166		$	634,466		$	662,619		$	673,626
Cost of revenue	433,858		286,894		293,738			301,655			486,248			325,041			334,552			364,175
Gross profit	366,069		305,989		323,658			324,885			386,918			309,425			328,067			309,451
Income (loss) from operations	61,876		53,023		(64,245		)	3,385			49,726			(1,213		)	(7,398		)	(11,680		)
Income (loss) from continuing operations (1)	49,862		47,175		(92,254		)	(2,795		)	51,071			3,802			(5,403		)	(20,869		)
Income (loss) from discontinued operations, net of tax	—		—		—			—			(223		)	(862		)	(1,376		)	487
Net income (loss) attributable to Groupon, Inc.	46,228		44,615		(95,034		)	(6,888		)	47,721			59			(9,326		)	(24,414		)
Basic net income (loss) per share (3) :
Continuing operations	$	0.08	$	0.08	$	(0.17	)	$	(0.01	)	$	0.09		$	0.00		$	(0.01	)	$	(0.04	)
Discontinued operations	0.00		0.00		0.00			0.00			(0.00		)	(0.00		)	(0.01		)	0.00
Basic net income (loss) per share	$	0.08	$	0.08	$	(0.17	)	$	(0.01	)	$	0.09		$	0.00		$	(0.02	)	$	(0.04	)
Diluted net income (loss) per share (3):
Continuing operations	$	0.08	$	0.08	$	(0.17	)	$	(0.01	)	$	0.08		$	0.00		$	(0.01	)	$	(0.04	)
Discontinued operations	0.00		0.00		0.00			0.00			(0.00		)	(0.00		)	(0.01		)	0.00
Diluted net income (loss) per share	$	0.08	$	0.08	$	(0.17	)	$	(0.01	)	$	0.08		$	0.00		$	(0.02	)	$	(0.04	)

(1) Income (loss) from continuing operations includes restructuring charges of $11.5 million, $4.6 million and $2.7 million for the three months ended September 30, 2017, June 30, 2017 and March 31, 2017. Restructuring charges were not material for any quarterly period during the year ended December 31, 2018 or for the three months ended December 31, 2017.

(2) Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

(3) The sum of per share amounts for quarterly periods may not equal year-to-date amounts due to rounding.

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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2018

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

Schedule II-Valuation and Qualifying Accounts

	Balance at Beginning of Year	Charged to Expense(1)	Acquisitions and Other		Balance at End of Year
	(in thousands)
TAX VALUATION ALLOWANCE:
Year ended December 31, 2018	238,702	3,829	(14,508	)	228,023
Year ended December 31, 2017	220,611	10,476	7,615		238,702
Year ended December 31, 2016	205,152	13,797	1,662		220,611

(1) The amount charged to expense related to the income tax valuation allowance for the year ended December 31, 2017 reflects a $46.5 million expense from discontinued operations, partially offset by a $36.1 million benefit from continuing operations. The $46.5 million discontinued operations expense reflects the valuation allowance recognized against loss carryforwards relating to tax losses on the stock of subsidiaries that were divested in 2017.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Impairment of Long-Lived Assets

Impairment of Long-Lived Assets

Long-lived assets, such as property, equipment and software and intangible assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. If circumstances require that a long-lived asset or asset group to be held and used be tested for possible impairment, we first compare the undiscounted cash flows expected to be generated by that long-lived asset or asset group to its carrying amount. If the carrying amount of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment is recognized to the extent that the carrying amount exceeds its fair value.

Long-lived assets or disposal groups classified as held for sale are recorded at the lower of their carrying amount or fair value less estimated selling costs. Long-lived assets are not depreciated or amortized while classified as held for sale.

Goodwill

Goodwill

Goodwill is allocated to our reporting units at the date the goodwill is initially recorded. Once goodwill has been allocated to the reporting units, it no longer retains its identification with a particular acquisition and becomes identified with the reporting unit in its entirety. Accordingly, the fair value of the reporting unit as a whole is available to support the recoverability of its goodwill.

We evaluate goodwill for impairment annually on October 1 or more frequently when an event occurs or circumstances change that indicates the carrying value may not be recoverable. We have the option to assess goodwill for impairment by first performing a qualitative assessment to determine whether it is more-likely-than-not that the fair value of a reporting unit is less than its carrying amount. If we determine that it is not more-likely-than-not that the fair value of a reporting unit is less than its carrying amount, then the two-step goodwill impairment test is not required to be performed. If we determine that it is more-likely-than-not that the fair value of a reporting unit is less than its carrying amount, or if we do not elect the option to perform an initial qualitative assessment, we perform the two-step goodwill impairment test. In the first step, the fair value of the reporting unit is compared with its book value including goodwill. If the fair value of the reporting unit is in excess of its book value, the related goodwill is not impaired and no further analysis is necessary. If the fair value of the reporting unit is less than its book value, there is an indication of potential impairment and a second step is performed. When required, the second step of testing involves calculating the implied fair value of goodwill for the reporting unit. The implied fair value of goodwill is determined in the same manner as goodwill recognized in a business combination, which is the excess of the fair value of the reporting unit determined in step one over the fair value of its net assets, including identifiable intangible assets, as if the reporting unit had been acquired. If the carrying value of the reporting unit's goodwill exceeds the implied fair value of that goodwill, an impairment loss is recognized in an amount equal to that excess. For reporting units with a negative book value (i.e., excess of liabilities over assets), we evaluate qualitative factors to determine whether it is necessary to perform the second step of the goodwill impairment test.

Internal-Use Software

Internal-Use Software

We incur costs related to internal-use software and website development, including purchased software and internally-developed software. Costs incurred in the planning and evaluation stage of internally-developed software and website development are expensed as incurred. Costs incurred and accumulated during the application development stage are capitalized and included within Property, equipment and software, net on the consolidated balance sheets. Amortization of internal-use software is recorded on a straight-line basis over the two-year estimated useful life of the assets.

Principles of Consolidation

Principles of Consolidation

The consolidated financial statements include the accounts of Groupon, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The consolidated financial statements were prepared in accordance with U.S. GAAP and include the assets, liabilities, revenue and expenses of all wholly-owned subsidiaries and majority-owned subsidiaries over which we exercise control and variable interest entities for which we have determined that we are the primary beneficiary. Outside stockholders' interests in subsidiaries are shown on the consolidated financial statements as Noncontrolling interests. Investments in entities in which we do not have a controlling financial interest are accounted for under the equity method, the fair value option, as available-for-sale securities or at cost adjusted for observable price changes and impairments, as appropriate.

Reclassification and Terminology Changes

Reclassifications and Terminology Changes

Certain reclassifications have been made to the consolidated financial statements of prior periods and the accompanying notes to conform to the current period presentation, including the change in presentation of restricted cash in the consolidated statements of cash flows upon adoption of ASU 2016-18 as described above. Additionally, in prior years, we referred to our product revenue and service revenue as "direct revenue" and "third-party and other revenue," respectively. This terminology change did not impact the amounts presented in the consolidated financial statements.

Use of Estimates

Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires estimates and assumptions that affect the reported amounts and classifications of assets and liabilities, revenue and expenses, and the related disclosures of contingent liabilities in the consolidated financial statements and accompanying notes. Estimates are used for, but not limited to, variable consideration from unredeemed vouchers, income taxes, initial valuation and subsequent impairment testing of goodwill and intangible assets, investments, customer refunds, contingent liabilities and the useful lives of property, equipment and software and intangible assets. Actual results could differ materially from those estimates.

Adoption of New Accounting Standards

We adopted the guidance in ASC Topic 606, Revenue from Contracts with Customers, on January 1, 2018. Topic 606 is a comprehensive new revenue recognition model that requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. See Note 13, Revenue Recognition, for information on the impact of adopting Topic 606 on our accounting policies.

We adopted the guidance in ASU 2016-01, Financial Instruments (Topic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities, as amended, on January 1, 2018. This ASU generally requires equity investments to be measured at fair value with changes in fair value recognized through net income and eliminates the cost method for equity securities. However, for equity investments without readily determinable fair values, the ASU permits entities to elect to measure the investments at cost adjusted for observable price changes and impairments, with changes in the measurement recognized through net income. We applied that measurement alternative to our equity investments that were previously accounted for under the cost method. The adoption of ASU 2016-01 did not have a material impact on the consolidated financial statements.

We adopted the guidance in ASU 2016-18, Statement of Cash Flows (Topic 230) - Restricted Cash, on January 1, 2018. This ASU requires companies to include amounts generally described as restricted cash and restricted cash equivalents, along with cash and cash equivalents, when reconciling the beginning-of-period and end-of-period amounts shown on the statement of cash flows. Previously, changes in restricted cash were reported within cash flows from operating activities. We applied that change in cash flow classification on a retrospective basis, which resulted in a $7.0 million decrease and a $1.3 million increase to net cash provided by operating activities for the years ended December 31, 2017 and 2016.

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets to amounts shown in the consolidated statements of cash flows, as of December 31, 2018, 2017 and 2016 (in thousands):

	December 31, 2018		December 31, 2017		December 31, 2016
Cash and cash equivalents	$	841,021	$	880,129	$	862,977
Restricted cash included in prepaid expenses and other current assets	3,320		4,932		5,769
Restricted cash included in other non-current assets	387		420		6,160
Cash, cash equivalents and restricted cash	$	844,728	$	885,481	$	874,906

We adopted the guidance in ASU 2017-05, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20) - Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets, on January 1, 2018. This ASU is meant to clarify the scope of ASC Subtopic 610-20, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets, and to add guidance for partial sales of nonfinancial assets. The adoption of ASU 2017-05 did not have a material impact on the consolidated financial statements.

We adopted the guidance in ASU 2017-07, Compensation - Retirement Benefits (Topic 715) - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, on January 1, 2018. This ASU requires employers to include only the service cost component of net periodic pension cost in operating expenses, together with other employee compensation costs. The other components of net periodic pension cost, including interest cost, expected return on plan assets, amortization of prior service cost and settlement and curtailment effects, are to be included in non-operating expenses. The adoption of ASU 2017-07 did not have a material impact on the consolidated financial statements.

We adopted the guidance in ASU 2017-09, Compensation - Stock Compensation (Topic 718) - Scope of Modification Accounting, on January 1, 2018. This ASU clarifies the changes to terms or conditions of a share-based payment award that require an entity to apply modification accounting. The adoption of ASU 2017-09 did not have a material impact on the consolidated financial statements.

We adopted the guidance in ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, as of January 1, 2018. This ASU permits a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (the "Jobs Act"). As a result of the adoption of ASU 2018-02, we reclassified $0.2 million from accumulated other comprehensive income to accumulated deficit.

We adopted the guidance in ASU 2017-01, Business Combinations (Topic 805) - Clarifying the Definition of a Business, on July 1, 2017. This ASU provides clarification on the definition of a business and provides guidance on whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The guidance in ASU 2017-01 was applied in determining that the sale of customer lists and other intangible assets in certain food delivery markets, as described in Note 6, Goodwill and Other Intangible Assets, did not meet the definition of a business. The adoption of ASU 2017-01 did not otherwise impact the accompanying consolidated financial statements.

We adopted the guidance in ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (Topic 740), on January 1, 2017. This ASU requires immediate recognition of the income tax consequences of intercompany asset transfers other than inventory. We recorded a $3.2 million cumulative effect adjustment to increase our accumulated deficit as of January 1, 2017 to recognize the impact of that change in accounting policy.

We adopted the guidance in ASU 2015-11, Inventory (Topic 330) - Simplifying the Measurement of Inventory, on January 1, 2017. This ASU requires inventory to be measured at the lower of cost or net realizable value, rather than the lower of cost or market. The adoption of ASU 2015-11 did not have a material impact on the accompanying consolidated financial statements.

We adopted the guidance in ASU 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40) - Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern, as of December 31, 2016. This ASU requires management to assess a company's ability to continue as a going concern and to provide related disclosures in certain circumstances. Based on the results of our analysis, no additional disclosures were required.

We adopted the guidance in ASU 2016-09, Compensation - Stock Compensation (Topic 718) - Improvements to Employee Share-Based Payment Accounting, on January 1, 2016. Under this ASU, entities are permitted to make an accounting policy election to either estimate forfeitures on share-based payment awards, as previously required, or to recognize forfeitures as they occur. We elected to recognize forfeitures as they occur and the impact of that change in accounting policy was recorded as a $3.1 million cumulative effect adjustment to increase accumulated deficit as of January 1, 2016. Additionally, ASU 2016-09 requires that all income tax effects related to settlements of share-based payment awards be reported in earnings as an increase or decrease to provision (benefit) for income taxes. Previously, income tax benefits at settlement of an award were reported as an increase (or decrease) to additional paid-in capital to the extent that those benefits were greater than (or less than) the income tax benefits reported in earnings during the award's vesting period. The requirement to report those income tax effects in earnings was applied on a prospective basis to settlements occurring on or after January 1, 2016. ASU 2016-09 also requires that all income tax-related cash flows resulting from share-based payment awards be reported as operating activities in the consolidated statement of cash flows. Previously, income tax benefits at settlement of an award were reported as a reduction to operating cash flows and an increase to financing cash flows to the extent that those benefits exceeded the income tax benefits reported in earnings during the award's vesting period. The Company elected to apply that change in cash flow classification on a retrospective basis, which resulted in an increase of $7.6 million to net cash provided by operating activities and a corresponding increase to net cash used in financing activities for the year ended December 31, 2015. The remaining provisions of ASU 2016-09 did not have a material impact on the accompanying consolidated financial statements.

We adopted the guidance in ASU 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis, on January 1, 2016. This ASU expands the variable interest entity ("VIE") criteria to specifically include limited partnerships in certain circumstances. The adoption of ASU 2015-02 did not have a material impact on the accompanying consolidated financial statements. We determined that Monster Holdings LP ("Monster LP") is not a VIE under ASU 2015-02, which is consistent with its conclusion prior to adoption of the ASU. That investment is evaluated as a corporation, rather than a limited partnership, for purposes of making consolidation determinations because its governance structure is akin to a corporation. Under the terms of Monster LP’s amended and restated agreement of limited partnership, all of the objectives and purposes of Monster LP are carried out by a board of directors, rather than a general partner.

Costs of Obtaining Contracts and Cost of Revenue

Costs of Obtaining Contracts

Incremental costs to obtain contracts with third-party merchants, such as sales commissions, are deferred and recognized over the expected period of the merchant arrangement, generally from 12 to 18 months. Those costs are classified within Selling, general and administrative expenses in the consolidated statements of operations.

Cost of Revenue

Cost of revenue is comprised of direct and certain indirect costs incurred to generate revenue. Costs incurred to generate revenue, which include credit card processing fees, editorial costs, compensation expense for technology support personnel who are responsible for maintaining the infrastructure of our websites, amortization of internal-use software relating to customer-facing applications, web hosting and other processing fees are attributed to the cost of service and product revenue in proportion to gross billings during the period. For product revenue transactions, cost of revenue also includes the cost of inventory, shipping and fulfillment costs and inventory markdowns. Fulfillment costs are comprised of third-party logistics provider costs, as well as rent, depreciation, personnel costs and other costs of operating our fulfillment center.

Financial Instruments

Investments in equity shares without a readily determinable fair value and for which we do not have the ability to exercise significant influence are accounted for at cost adjusted for observable price changes and impairments, with changes in the measurement recognized through net income. Those investments are classified within Investments on the consolidated balance sheets.

Investments in common stock or in-substance common stock for which we have the ability to exercise significant influence are accounted for under the equity method, except where we have made an irrevocable election to account for the investments at fair value. Those investments are classified within Investments on the consolidated balance sheets. The proportionate share of income or loss on equity method investments and changes in the fair values of investments for which the fair value option has been elected are presented within Other income (expense), net on the consolidated statements of operations.

Investments in convertible debt securities and convertible redeemable preferred shares are accounted for as available-for-sale securities, which are classified within Investments on the consolidated balance sheets. Available-for-sale securities are recorded at fair value each reporting period. Unrealized gains and losses, net of the related tax effects, are excluded from earnings and recorded as a separate component within Accumulated other comprehensive income on the consolidated balance sheets until realized. Interest income from available-for-sale securities is reported within Other income (expense), net on the consolidated statements of operations.

Other-than-Temporary Impairment of Investments

An unrealized loss exists when the current fair value of an investment is less than its cost basis. We conduct reviews of our investments with unrealized losses on a quarterly basis to evaluate whether those impairments are other-than-temporary. This evaluation, which is performed at the individual investment level, considers qualitative and quantitative factors regarding the severity and duration of the unrealized loss, as well as our intent and ability to hold the investment for a period of time that is sufficient to allow for an anticipated recovery in value. Evidence considered in this evaluation includes the amount of the impairment, the length of time that the investment has been impaired, the factors contributing to the impairment, the financial condition and near-term prospects of the investee, recent operating trends and forecasted performance of the investee, market conditions in the geographic area or industry in which the investee operates and our strategic plans for holding the investment in relation to the period of time expected for an anticipated recovery in value. Additionally, we consider whether we intend to sell the investment or whether it is more likely than not that it will be required to sell the investment before recovery of its amortized cost basis. Investments with unrealized losses that are determined to be other-than-temporary are written down to fair value with a charge to earnings. Unrealized losses that are determined to be temporary in nature are not recorded for equity method investments, while such losses are recorded, net of tax, in accumulated other comprehensive income for available-for-sale securities.

Cash, Cash Equivalents and Restricted Cash

Cash, Cash Equivalents and Restricted Cash

We consider all highly liquid investments with an original maturity of three months or less from the date of purchase to be cash equivalents. Restricted cash represents amounts that we are unable to access for operational purposes. These amounts primarily relate to withholdings from employee paychecks under our employee stock purchase plan ("ESPP").

Accounts Receivable, Net

Accounts Receivable, Net

Accounts receivable primarily represents the net cash due from credit card and other payment processors and from merchants and performance marketing networks for commissions earned on consumer purchases. The carrying amount of receivables is reduced by an allowance for doubtful accounts that reflects management's best estimate of amounts that will not be collected. The allowance is based on historical loss experience and any specific risks identified in collection matters. Accounts receivable are charged off against the allowance for doubtful accounts when it is determined that the receivable is uncollectible.

Inventories

Inventories

 Inventories, consisting of merchandise purchased for resale, are accounted for using the first-in, first-out method of accounting and are valued at the lower of cost or net realizable value. We write down our inventory to the lower of cost or net realizable value based upon assumptions about future demand and market conditions. If actual market conditions are less favorable than those projected, additional inventory write-downs may be required. Once established, the original cost of the inventory less the related inventory write-down represents a new cost basis.

Property and Equipment

Property and Equipment

Property and equipment are stated at cost and assets under capital leases are stated at the lesser of the present value of minimum lease payments or their fair market value. Depreciation and amortization of property and equipment is recorded on a straight-line basis over the estimated useful lives of the assets. Generally, the useful lives are three to five years for computer hardware and office equipment, five to ten years for furniture and fixtures and warehouse equipment and the shorter of the term of the lease or the asset’s useful life for leasehold improvements and assets under capital leases.

Income Taxes

Income Taxes

We account for income taxes using the asset and liability method, under which deferred income tax assets and liabilities are recognized based upon anticipated future tax consequences attributable to differences between the financial statement carrying amounts of assets and liabilities and their respective tax bases. We regularly review deferred tax assets to assess whether it is more likely than not that the deferred tax assets will be realized and, if necessary, establish a valuation allowance for portions of such assets to reduce the carrying value.

For purposes of assessing whether it is more likely than not that deferred tax assets will be realized, we consider the following four sources of taxable income for each tax jurisdiction: (a) future reversals of existing taxable temporary differences, (b) projected future earnings, (c) taxable income in carryback years, to the extent that carrybacks are permitted under the tax laws of the applicable jurisdiction, and (d) tax planning strategies, which represent prudent and feasible actions that a company ordinarily might not take, but would take to prevent an operating loss or tax credit carryforward from expiring unused. To the extent that evidence about one or more of these sources of taxable income is sufficient to support a conclusion that a valuation allowance is not necessary, other sources need not be considered. Otherwise, evidence about each of the sources of taxable income is considered in arriving at a conclusion about the need for and amount of a valuation allowance. See Note 15, Income Taxes, for further information about our valuation allowance assessments.

We are subject to taxation in the United States, various states and foreign jurisdictions. Significant judgment is required in determining the worldwide provision for income taxes and recording the related income tax assets and liabilities. During the ordinary course of business, there are many transactions and calculations for which the ultimate tax determination is uncertain. For example, our effective tax rate could be adversely affected by earnings being lower than anticipated in countries where it has lower statutory rates and higher than anticipated in countries where it has higher statutory rates, by changes in foreign currency exchange rates, by changes in the valuation of deferred tax assets and liabilities, by changes in the measurement of uncertain tax positions or by changes in the relevant laws, regulations, principles and interpretations. We account for uncertainty in income taxes by recognizing the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit. For tax positions meeting the more-likely-than-not criteria, the amount recognized in the consolidated financial statements is the largest benefit that has a greater than 50 percent likelihood of being realized upon ultimate settlement with the relevant tax authority.

Lease and Asset Retirement Obligations

Lease and Asset Retirement Obligations

We classify leases at their inception as either operating or capital leases and may receive renewal or expansion options, rent holidays and leasehold improvement or other incentives on certain lease agreements. We recognize operating lease costs on a straight-line basis, taking into account adjustments for escalating payments and lease incentives. Rent expense associated with operating lease obligations is primarily classified within Selling, general and administrative on the consolidated statements of operations. Minimum lease payments made under capital leases are apportioned between interest expense, which is presented within Other income (expense), net on the consolidated statements of operations, and a reduction of the related capital lease obligations, which are classified within Accrued expenses and other current liabilities and Other non-current liabilities on the consolidated balance sheets.

We establish assets and liabilities for the present value of estimated future costs to retire long-lived assets at the termination or expiration of a lease. Such assets are amortized over the lease term, and the recorded liabilities are accreted to the future value of the estimated retirement costs. The related amortization and accretion expenses are presented within Selling, general and administrative on the consolidated statements of operations.

Revenue Recognition

Revenue Recognition

On January 1, 2018, we adopted Topic 606 using the modified retrospective method. Beginning on January 1, 2018, results are presented in accordance with the revised policies, while prior period amounts are not adjusted and continue to be reported in accordance with our historical policies. See Note 13, Revenue Recognition, for additional information.

We recognize revenue when we satisfy a performance obligation by transferring a promised good or service to a customer. Substantially all of our performance obligations are satisfied at a point in time rather than over time.

Service revenue

Service revenue is primarily earned from transactions in which we earn commissions by selling goods or services on behalf of third-party merchants. Those transactions generally involve a customer's purchase of a voucher through one of our online marketplaces that can be redeemed with a third-party merchant for specified goods or services (or for discounts on specified goods or services). Service revenue from those transactions is reported on a net basis as the purchase price collected from the customer less the portion of the purchase price that is payable to the third-party merchant. We recognize revenue from those transactions when our commission has been earned, which occurs when a sale through one of our online marketplaces is completed and the related voucher has been made available to the customer. We believe that our remaining obligations to remit payment to the merchant and to provide information about vouchers sold are administrative activities that are immaterial in the context of the contract with the merchant. Revenue from hotel reservation offerings is recognized at the time the reservation is made, net of an allowance for estimated cancellations.

We also earn commissions when customers make purchases with retailers using digital coupons accessed through our websites and mobile applications and from voucherless merchant offerings in which customers earn cash back on their credit card statements when they transact with third-party merchants. We recognize those commissions as revenue in the period in which the underlying transactions between the customer and the third-party merchant are completed. Additionally, we earn advertising revenue when the advertiser's logo or website link has been included on our websites or in specified email distributions for the requisite period of time as set forth in the agreement with the advertiser.

Product revenue

We generate product revenue from direct sales of merchandise inventory through our Goods category. For product revenue transactions, we are the primary party responsible for providing the good to the customer, we have inventory risk and we have discretion in establishing prices. As such, product revenue is reported on a gross basis as the purchase price received from the customer. Product revenue, including associated shipping revenue, is recognized when title passes to the customer upon delivery of the product.

Variable Consideration for Unredeemed Vouchers

For merchant agreements with redemption payment terms, the merchant is not paid its share of the sale price for a voucher sold through one of our online marketplaces until the customer redeems the related voucher. If the customer does not redeem a voucher with such merchant payment terms, we retain all of the gross billings for that voucher, rather than retaining only our net commission. We estimate the variable consideration from vouchers that will not ultimately be redeemed using our historical voucher redemption experience and recognize that amount as revenue at the time of sale. We only recognize amounts in variable consideration when we believe it is probable that a significant reversal of revenue will not occur in future periods, which requires us to make significant estimates of future redemptions. If actual redemptions differ from our estimates, the effects could be material to the consolidated financial statements. As of December 31, 2018, we constrained $13.7 million in revenue from unredeemed vouchers that we may recognize in future periods when we determine it is probable that a significant amount of that revenue will not be subsequently reversed.

Refunds

Refunds are recorded as a reduction of revenue. The liability for estimated refunds is included within Accrued expenses and other current liabilities on the consolidated balance sheets.

We estimate our refund reserve using historical refund experience by deal category. We assess the trends that could affect our estimates on an ongoing basis and make adjustments to the refund reserve calculations if it appears that changes in circumstances, including changes to our refund policies or general economic conditions, may cause future refunds to differ from our initial estimates. If actual refunds differ from our estimates, the effects could be material to the consolidated financial statements.

Discounts, Customer Credits and Other Consideration Payable to Customers

We provide discount offers to encourage purchases of goods and services through our online marketplaces. We record discounts as a reduction of revenue.

Additionally, we issue credits to customers that can be applied to future purchases through our online marketplaces. Credits are primarily issued as consideration for refunds. To a lesser extent, credits are issued for customer relationship purposes. Credits issued to satisfy refund requests are applied as a reduction to the refunds reserve and customer credits issued for relationship purposes are classified as a reduction of revenue. Breakage income from customer credits that are not expected to be used is estimated and recognized as revenue in proportion to the pattern of redemption for customer credits that are used.

Sales and related taxes

Sales, use, value-added and related taxes that are imposed on specific revenue-generating transactions are presented on a net basis and excluded from revenue.

Stock-Based Compensation

Stock-Based Compensation

We measure stock-based compensation cost at fair value. Expense is generally recognized on a straight-line basis over the service period during which awards are expected to vest, except for awards with both performance conditions and a graded vesting schedule, which are recognized using the accelerated method. We present stock-based compensation expense within the consolidated statements of operations based on the classification of the respective employees' cash compensation. See Note 12, Compensation Arrangements.

Foreign Currency

Foreign Currency

Balance sheet accounts of our operations outside of the United States are translated from foreign currencies into U.S. dollars at exchange rates as of the consolidated balance sheet dates. Revenue and expenses are translated at average exchange rates during the period. Foreign currency translation adjustments and foreign currency gains and losses on intercompany balances that are of a long-term investment nature are included within Accumulated other comprehensive income on the consolidated balance sheets. Foreign currency gains and losses resulting from transactions that are denominated in currencies other than the entity's functional currency, including foreign currency gains and losses on intercompany balances that are not of a long-term investment nature, are included within Other income (expense), net on the consolidated statements of operations.

Business Combinations

Business Combinations

The results of businesses acquired are included in the consolidated financial statements beginning on the respective acquisition dates. The fair value of consideration transferred in business combinations is allocated to the tangible and intangible assets acquired and liabilities assumed at the acquisition date, with the remaining unallocated amount recorded as goodwill. Acquired goodwill represents the premium paid over the fair value of the net tangible and intangible assets acquired. We may pay a premium for a number of reasons, including growing our merchant base and acquiring an assembled workforce. The goodwill from business combinations is generally not deductible for tax purposes.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets to amounts shown in the consolidated statements of cash flows, as of December 31, 2018, 2017 and 2016 (in thousands):

	December 31, 2018		December 31, 2017		December 31, 2016
Cash and cash equivalents	$	841,021	$	880,129	$	862,977
Restricted cash included in prepaid expenses and other current assets	3,320		4,932		5,769
Restricted cash included in other non-current assets	387		420		6,160
Cash, cash equivalents and restricted cash	$	844,728	$	885,481	$	874,906

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DISCONTINUED OPERATIONS AND OTHER BUSINESS DISPOSITIONS (Tables)

12 Months Ended

Dec. 31, 2018

Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax [Abstract]

Schedule of Gain (Loss) on Business Dispositions

For the years ended December 31, 2017 and 2016, we recognized a net pretax loss of $1.6 million and a net pretax gain of $0.3 million, respectively, on those dispositions, which consisted of the following (in thousands):

	Year Ended December 31,
	2017			2016
Net consideration received:
Fair value of minority investments retained or acquired	$	2,021		$	2,457
Cash proceeds received	3,462			—
Cash proceeds receivable	2,000			—
Less: transaction costs	1,394			190
Total net consideration received	6,089			2,267
Cumulative translation gain (loss) reclassified to earnings	14,718			(1,201		)
Less: Net book value upon closing of the transactions	14,958			754
Less: Indemnification liabilities (1)	5,365			—
Less: Unfavorable contract liability for transition services	2,114			—
Gain (loss) on dispositions	$	(1,630	)	$	312

(1) See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

We recognized a pretax gain of $11.4 million in connection with those transactions, which is presented within Gains on business dispositions in the accompanying consolidated statements of operations, and consisted of the following (in thousands):

	Year Ended December 31, 2016
Net consideration received:
Fair value of minority investments acquired	$	11,029
Less: transaction costs	849
Total net consideration received	10,180
Cumulative translation gain reclassified to earnings	7,468
Less: Net book value upon closing of the transactions	6,249
Gain on business dispositions	$	11,399

Schedule of Major Classes of Line Items Included in Income (Loss) From Discontinued Operations

The following table summarizes the major classes of line items included in loss from discontinued operations, net of tax, for the years ended December 31, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2017 (1) (2)			2016 (1)
Service revenue	$	12,602		$	97,105
Product revenue	2,962			32,634
Service cost of revenue	(2,557		)	(21,697		)
Product cost of revenue	(3,098		)	(31,792		)
Marketing expense	(1,239		)	(10,776		)
Selling, general and administrative expense	(12,007		)	(72,141		)
Restructuring	(778		)	(3,170		)
Other income (expense), net	3,852			(4,818		)
Loss from discontinued operations before gain (loss) on dispositions and provision for income taxes	(263		)	(14,655		)
Gain (loss) on dispositions	(1,630		)	312
Provision for income taxes	(81		)	(2,771		)
Loss from discontinued operations, net of tax	$	(1,974	)	$	(17,114	)

(1) The loss from discontinued operations before gain (loss) on dispositions and provision for income taxes for the years ended December 31, 2017 and 2016 includes the results of each business through its respective disposition date.

(2) Selling, general and administrative expense from discontinued operations for the year ended December 31, 2017 includes increases to contingent liabilities under indemnification agreements. See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

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BUSINESS COMBINATIONS (Tables)

12 Months Ended

Dec. 31, 2018

Business Combinations [Abstract]

Summary of Fair Value of Consideration Transferred in Acquisition

On October 31, 2016, we acquired all of the outstanding equity interests of LivingSocial, Inc. ("LivingSocial"), an e-commerce company that connects merchants to consumers by offering goods and services, generally at a discount. The primary purpose of this acquisition was to grow our customer base. We acquired LivingSocial for no consideration.

The following table summarizes the assets acquired and liabilities assumed from the LivingSocial acquisition (in thousands):

Cash and cash equivalents	$	15,479
Accounts receivable	3,652
Prepaid expenses and other current assets	2,399
Property, equipment and software	1,075
Goodwill	528
Intangible assets: (1)
Customer relationships	16,200
Merchant relationships	2,700
Trade name	1,000
Developed technology	2,500
Other non-current assets	5,495
Total assets acquired	$	51,028
Accounts payable	$	2,184
Accrued merchant and supplier payables	18,498
Accrued expenses and other current liabilities	25,854
Other non-current liabilities	4,492
Total liabilities assumed	$	51,028
Total acquisition price	$	—

(1) The estimated useful lives of the acquired intangible assets are 1 year for developed technology, 4 years for trade name and 3 years for merchant relationships and customer relationships.

On April 30, 2018, we acquired 80% of the outstanding shares of Cloud Savings Company, Ltd. ("Cloud Savings"), a UK-based business that operates online discount code and digital gift card platforms. The primary purpose of this acquisition was to expand digital coupon offerings in our International segment. The transaction included a contingent consideration arrangement with an acquisition-date fair value of $1.6 million. In additional, concurrent with the acquisition, we entered into an agreement with the noncontrolling shareholder that gave us the right to acquire and the noncontrolling shareholder's right to put to us the remaining outstanding shares of Cloud Savings in December 2018. The acquisition-date fair value of the right and obligation to acquire the remaining outstanding shares of $8.6 million was initially recorded as a financing obligation and classified within Accrued expenses and other current liabilities on the consolidated balance sheets. We paid $8.4 million to exercise that right in December 2018. The aggregate acquisition-date fair value of the consideration transferred for the Cloud Savings acquisition totaled $74.6 million, which consisted of the following (in thousands):

Cash	$	64,363
Financing obligation	8,604
Contingent consideration	1,589
Total	$	74,556

Summary of Allocation of Aggregate Acquisition Price

The following pro forma information presents the combined operating results for the year ended December 31, 2016 as if we had acquired LivingSocial as of January 1, 2016 (in thousands). The underlying pro forma results include the historical financial results of us and this acquired business adjusted for depreciation and amortization expense associated with the assets acquired. The pro forma results do not reflect any operating efficiencies or potential cost savings which may result from the consolidation of the operations of us and the acquired entity. Accordingly, these pro forma results are not necessarily indicative of what the actual combined results of operations would have been if the acquisition had occurred as of January 1, 2016, nor are they indicative of future results of operations.

	Year Ended December 31, 2016
Revenue	$	3,070,431
Loss from continuing operations	(182,781		)

The revenue and net loss of LivingSocial included in our consolidated statements of operations were $9.3 million and $4.3 million, for the period from October 31, 2016 through December 31, 2016.

The following table summarizes the allocation of the aggregate acquisition price of the Cloud Savings acquisition (in thousands). The allocation of the acquisition price has been prepared on a preliminary basis, and changes to that allocation may occur as a result of final working capital adjustments and tax return filings.

Cash and cash equivalents	$	6,244
Accounts receivable	5,885
Prepaid expenses and other current assets	804
Property, equipment and software	226
Goodwill	46,515
Intangible assets (1) :
Merchant relationships	20,322
Trade names	2,609
Developed technology	549
Other intangible assets	687
Total assets acquired	$	83,841
Accounts payable	$	693
Accrued merchant and supplier payables	386
Accrued expenses and other current liabilities	6,130
Other non-current liabilities	2,076
Total liabilities assumed	$	9,285
Total acquisition price	$	74,556

(1) The estimated useful lives of the acquired intangible assets are 6 years for merchant relationships, 8 years for trade names, 2 years for developed technology, and 1 year for other intangible assets.

^[1]

[1] The estimated useful lives of the acquired intangible assets are 6 years for merchant relationships, 8 years for trade names, 2 years for developed technology, and 1 year for other intangible assets.

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PROPERTY, EQUIPMENT AND SOFTWARE, NET (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant, Equipment and Software

Depreciation and amortization expense on property, equipment and software is classified as follows in the accompanying consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
Service cost of revenue	$	28,102	$	26,738	$	21,277
Product cost of revenue	8,467		9,900		10,616
Selling, general and administrative	64,761		78,157		85,068
Total	$	101,330	$	114,795	$	116,961

The above amounts include amortization of internally-developed software of $53.9 million, $57.0 million and $55.0 million, and amortization expense on assets under capital leases of $30.2 million, $35.2 million and $29.8 million, for the years ended December 31, 2018, 2017 and 2016.

The following summarizes property, equipment and software, net as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018			2017
Warehouse equipment	$	5,265		$	4,989
Furniture and fixtures	9,677			11,700
Leasehold improvements	50,314			49,605
Office equipment	2,261			2,690
Purchased software	8,523			32,090
Computer hardware (1)	174,700			208,659
Internally-developed software (2)	196,807			249,207
Total property, equipment and software, gross	447,547			558,940
Less: accumulated depreciation and amortization	(304,430		)	(407,795		)
Property, equipment and software, net	$	143,117		$	151,145

(1) Includes computer hardware acquired under capital leases of $120.5 million and $132.3 million as of December 31, 2018 and 2017.

(2) The net carrying amount of internally-developed software was $70.9 million and $64.5 million as of December 31, 2018 and 2017

The following table summarizes depreciation and amortization of property, equipment and software and intangible assets by reportable segment for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
North America	$	101,419	$	121,616	$	116,865
International	14,409		16,211		19,044
Consolidated total	$	115,828	$	137,827	$	135,909

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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table summarizes goodwill activity by segment for the years ended December 31, 2018 and 2017 (in thousands):

	North America		EMEA			Rest of World			International			Consolidated
Balance as of December 31, 2016	$	178,685	$	89,747		$	6,119		$	—		$	274,551
Reallocation to new segment (1)	—		(89,747		)	(6,119		)	95,866			—
Foreign currency translation	—		—			—			12,438			12,438
Balance as of December 31, 2017	$	178,685	$	—		$	—		$	108,304		$	286,989
Goodwill related to acquisition	—		—			—			46,515			46,515
Foreign currency translation	—		—			—			(8,013		)	(8,013		)
Balance as of December 31, 2018	$	178,685	$	—		$	—		$	146,806		$	325,491

Schedule of Intangible Assets

The following table summarizes intangible assets as of December 31, 2018 and 2017 (in thousands):

	December 31, 2018						December 31, 2017
	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Customer relationships	$	16,200	$	11,700	$	4,500	$	56,749	$	46,513	$	10,236
Merchant relationships	21,554		4,105		17,449		11,598		9,853		1,745
Trade names	9,476		6,799		2,677		12,077		10,469		1,608
Developed technology	13,825		13,485		340		36,864		36,864		—
Patents	20,508		16,451		4,057		19,031		15,204		3,827
Other intangible assets	26,007		9,629		16,378		10,875		9,095		1,780
Total	$	107,570	$	62,169	$	45,401	$	147,194	$	127,998	$	19,196

Schedule of Estimated Future Amortization Expense

As of December 31, 2018, our estimated future amortization expense related to intangible assets is as follows (in thousands):

2019	$	13,807
2020	7,535
2021	6,811
2022	6,495
2023	5,346
Thereafter	5,407
Total	$	45,401

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INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Equity Method Investments [Abstract]

Summary of Investments

In May 2015, we completed the sale of a controlling stake in Ticket Monster to an investor group, whereby (a) the investor group contributed $350.0 million in cash to Monster LP, a newly-formed limited partnership, in exchange for 70,000,000 Class A units of Monster LP and (b) we contributed all of the issued and outstanding share capital of Ticket Monster to Monster LP in exchange for (i) 64,000,000 Class B units of Monster LP and (ii) $285.0 million in cash consideration. Mr. Daniel Shin, the chief executive officer and founder of Ticket Monster, contributed $10.0 million of cash consideration to Monster LP shortly after the closing date in exchange for 2,000,000 Class A units of Monster LP. Additionally, Monster LP was authorized to issue 20,321,839 Class C units to its management, subject to vesting conditions. Under the terms of the Partnership’s amended and restated agreement of limited partnership, its general partner established a Board of Directors and irrevocably assigned the rights to carry out any and all of the objectives and purposes of the partnership to its Board. The general partner is not entitled to receive any distributions.

During the fourth quarter of 2015, the Company sold 2,515,461 Class B units for $4.8 million to Mr. Daniel Shin and other employees of Ticket Monster, which resulted in a gain of $0.1 million.

In January 2016, all 20,321,839 of the authorized Class C units were granted to Monster LP’s employees. Those share-based payment awards are subject to time-based vesting conditions and, for a portion of the Class C units, a performance-based vesting condition.

In December 2016, Monster LP issued a new class of partnership units (Class A-1) to its controlling investor group and a new investor for total proceeds of $65.0 million. The fair value of Monster LP implied by the terms of the $65.0 million equity financing transaction in December 2016 was lower than its estimated fair value in previous periods, which resulted in a significant decrease in the fair value of our investment for the year ended December 31, 2016.

In February 2017, we participated in a recapitalization transaction with Monster LP whereby it exchanged all 61,484,539 of its Class B units for 16,609,195 newly issued Class A-1 units. The Class B units previously held were then distributed from Monster LP to its controlling investor group and certain other existing unit holders. Upon closing of the transaction, we own 57% of the outstanding Class A-1 units, which represents 9% of the total outstanding partnership units.

Following the February 2017 recapitalization transaction, the Class A-1 units are entitled to an $150.0 million liquidation preference, including an $85.0 million liquidation preference attributable to the Class A-1 units held by us, which must be paid prior to any distributions to the holders of the Class A-2, Class B and Class C units. Class A-1 unit holders are also entitled to share in distributions between $950.0 million and $1,494.0 million in accordance with the terms of Monster LP's distribution waterfall and in distributions in excess of $1,494.0 million based on their pro rata ownership of total outstanding partnership units. As a result of the February 2017 recapitalization transaction, we currently hold an investment in the most senior equity units in Monster LP’s capital structure. However, while providing more downside protection, those Class A-1 units provide less opportunity for appreciation than the Class B units previously held by us.

The following tables summarize the condensed financial information for Monster LP as of December 31, 2018 and 2017 and for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017			2016
Revenue	$	416,042		$	280,612		$	216,119
Gross profit	27,838			37,773			24,774
Loss before income taxes	(132,276		)	(124,873		)	(153,882		)
Net loss	(132,276		)	(124,873		)	(153,882		)

	December 31,
	2018		2017
Current assets	$	85,844	$	174,051
Non-current assets	482,505		520,105
Current liabilities	432,133		438,988
Non-current liabilities	78,434		60,977

In August 2015, Groupon India completed an equity financing transaction with a third-party investor that obtained a majority voting interest in the entity, whereby (a) the investor contributed $17.0 million in cash to Nearbuy, a newly formed Singapore-based entity, in exchange for Series A Preference Shares and (b) we contributed the shares of Groupon India to Nearbuy in exchange for seed preference shares of Nearbuy. In January 2017, Nearbuy issued additional Series A Preference Shares to its controlling investor for total proceeds of $3.0 million. Upon closing of that transaction, the Series A Preference Shares are entitled to a $20.0 million liquidation preference, which must be paid prior to any distributions to other equity holders.

In December 2017, Nearbuy sold its subsidiary Nearbuy India Pte Ltd., which represented substantially all of its business operations, to a third-party investor in exchange for a minority investment in the acquirer.

The following tables summarize the condensed financial information for Nearbuy as of December 31, 2018 and 2017 and for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017		2016
Revenue	$	6,016		$	3,839	$	3,024
Gross profit	5,857			3,405		2,570
Income (loss) before income taxes (1)	(13,594		)	15,122		(15,701		)
Net income (loss) (1)	(13,594		)	15,122		(15,701		)

	December 31,
	2018		2017
Current assets	$	5,286	$	41
Non-current assets	46,940		18,362
Current liabilities	4,015		—
Non-current liabilities	144		—

The following table summarizes investments as of December 31, 2018 and 2017 (dollars in thousands):

	December 31, 2018		Percent Ownership of Voting Stock			December 31, 2017		Percent Ownership of Voting Stock
Available-for-sale securities:
Convertible debt securities	$	—				$	11,354
Redeemable preferred shares	10,340		19%	to	25%	15,431		19%	to	25%
Total available-for-sale securities	10,340					26,785
Fair value option investments	73,902		10%	to	19%	82,966		10%	to	19%
Other equity investments (1)	24,273		1%	to	19%	25,438		1%	to	19%
Total investments	$	108,515				$	135,189

(1) Represents equity investments without readily determinable fair values. Those investments were previously accounted for using the cost method of accounting. Under the cost method, investments were carried at cost and adjusted only for other-than-temporary declines in fair value, certain distributions and additional investments. We adopted the guidance in ASU 2016-01 on January 1, 2018. Under that guidance, we have elected to record equity investments without readily determinable fair values at cost adjusted for observable price changes and impairments. There were no adjustments for observable price changes related to these investments for the year ended December 31, 2018. See further discussion under Other Equity Investments below.

Schedule of Activity for Available For Sale Securities

The following table summarizes amortized cost, gross unrealized gain, gross unrealized loss and fair value of available-for-sale securities as of December 31, 2018 and 2017 (in thousands):

	December 31, 2018								December 31, 2017
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value		Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss (1)			Fair Value
Available-for-sale securities:
Convertible debt securities	$	—	$	—	$	—	$	—	$	10,205	$	1,653	$	(504	)	$	11,354
Redeemable preferred shares	9,961		379		—		10,340		15,431		—		—			15,431
Total available-for-sale securities	$	9,961	$	379	$	—	$	10,340	$	25,636	$	1,653	$	(504	)	$	26,785

(1) Gross unrealized loss is related to one security that was in a loss position for greater than 12 months as of December 31, 2017.

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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION (Tables)

12 Months Ended

Dec. 31, 2018

Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract]

Schedule of Other Income (Expense)

The following table summarizes other income (expense), net for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017			2016
Interest income	$	6,420		$	3,287		$	1,808
Interest expense	(21,909		)	(20,680		)	(15,912		)
Changes in fair value of investments	(9,064		)	382			(48,141		)
Gain on sale of investment	—			7,624			—
Foreign currency gains (losses), net	(20,325		)	18,634			(6,927		)
Impairments of investments	(10,156		)	(2,944		)	—
Other	2,026			407			(2,117		)
Other income (expense), net	$	(53,008	)	$	6,710		$	(71,289	)

Schedule of Prepaid and Other Current Assets

The following table summarizes prepaid expenses and other current assets as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Merchandise inventories	$	33,739	$	25,528
Prepaid expenses	28,209		40,399
Income taxes receivable	6,717		10,299
Other	19,450		17,799
Total prepaid expenses and other current assets	$	88,115	$	94,025

Schedule of Accrued Merchant and Supplier Payables

The following table summarizes accrued merchant and supplier payables as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Accrued merchant payables	$	371,279	$	459,662
Accrued supplier payables (1)	280,502		310,673
Total accrued merchant and supplier payables	$	651,781	$	770,335

(1) Amounts include payables to suppliers of inventories and providers of shipping and fulfillment services.

Schedule of Accrued Expenses and Other Current Liabilities

The following table summarizes accrued expenses and other current liabilities as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Refund reserve	$	27,957	$	31,275
Compensation and benefits	56,173		73,096
Accrued marketing	39,094		32,912
Customer credits	15,118		28,487
Income taxes payable	8,987		9,645
Deferred revenue	25,452		29,539
Current portion of capital lease obligations	17,207		25,958
Other	77,046		100,284
Total accrued expenses and other current liabilities	$	267,034	$	331,196

Schedule of Other Non-current Liabilities

The following table summarizes other non-current liabilities as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Contingent income tax liabilities	$	39,858	$	43,699
Deferred rent	32,186		29,032
Capital lease obligations	12,481		18,500
Deferred income taxes	6,619		811
Other	9,544		10,366
Total other non-current liabilities	$	100,688	$	102,408

Schedule of Accumulated Other Comprehensive Income (Loss)

	December 31,
	2018		2017
Contingent income tax liabilities	$	39,858	$	43,699
Deferred rent	32,186		29,032
Capital lease obligations	12,481		18,500
Deferred income taxes	6,619		811
Other	9,544		10,366
Total other non-current liabilities	$	100,688	$	102,408

The following table summarizes the components of accumulated other comprehensive income as of December 31, 2018 and 2017 (in thousands):

	Foreign currency translation adjustments			Unrealized gain (loss) on available-for-sale securities			Pension adjustments			Total
Balance as of December 31, 2015	$	52,261		$	458		$	(1,513	)	$	51,206
Other comprehensive income (loss) before reclassification adjustments	6,579			(70		)	830			7,339
Reclassification adjustments included in net income (loss)	(591		)	—			98			(493		)
Other comprehensive income (loss)	5,988			(70		)	928			6,846
Balance as of December 31, 2016	58,249			388			(585		)	58,052
Other comprehensive income (loss) before reclassification adjustments	(12,382		)	(1,109		)	—			(13,491		)
Reclassification adjustments included in net income (loss)	(14,905		)	1,603			585			(12,717		)
Other comprehensive income (loss)	(27,287		)	494			585			(26,208		)
Balance as of December 31, 2017	30,962			882			—			31,844
Other comprehensive income (loss) before reclassification adjustments	3,332			(841		)	—			2,491
Reclassification adjustments included in net income (loss)	—			106			—			106
Other comprehensive income (loss)	3,332			(735		)	—			2,597
Reclassification for impact of U.S. tax rate change	—			161			—			161
Balance as of December 31, 2018	$	34,294		$	308		$	—		$	34,602

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FINANCING ARRANGEMENTS (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Schedule of Notes

The carrying amount of the Notes consisted of the following as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018			2017
Liability component:
Principal amount	$	250,000		$	250,000
Less: debt discount	(48,331		)	(60,247		)
Net carrying amount of liability component	$	201,669		$	189,753
Net carrying amount of equity component	$	67,014		$	67,014

The carrying amount of the Notes consisted of the following as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018			2017
Liability component:
Principal amount	$	250,000		$	250,000
Less: debt discount	(48,331		)	(60,247		)
Net carrying amount of liability component	$	201,669		$	189,753
Net carrying amount of equity component	$	67,014		$	67,014

Schedule of Convertible Debt Interest Expense

As of December 31, 2018, the remaining term of the Notes is approximately 3 years and 3 months. During the years ended December 31, 2018, 2017 and 2016, we recognized interest costs on the Notes as follows (in thousands):

	Year Ended December 31,
	2018		2017		2016
Contractual interest (3.25% of the principal amount per annum)	$	8,128	$	8,128	$	6,095
Amortization of debt discount	11,916		10,758		7,376
Total	$	20,044	$	18,886	$	13,471

As of December 31, 2018, the remaining term of the Notes is approximately 3 years and 3 months. During the years ended December 31, 2018, 2017 and 2016, we recognized interest costs on the Notes as follows (in thousands):

	Year Ended December 31,
	2018		2017		2016
Contractual interest (3.25% of the principal amount per annum)	$	8,128	$	8,128	$	6,095
Amortization of debt discount	11,916		10,758		7,376
Total	$	20,044	$	18,886	$	13,471

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COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

As of December 31, 2018, the future payments under operating leases and capital leases for each of the next five years and thereafter are as follows (in thousands):    

	Capital Leases			Operating Leases
2019	$	18,169		$	32,533
2020	7,634			31,116
2021	4,784			26,876
2022	687			26,097
2023	—			21,944
Thereafter	—			31,633
Total minimum lease payments	31,274			$	170,199
Less: Amount representing interest	(1,586		)
Present value of net minimum capital lease payments	29,688
Less: Current portion of capital lease obligations	(17,207		)
Total long-term capital lease obligations	$	12,481

Long-term Purchase Commitment

We have entered into non-cancelable arrangements with third-parties, primarily related to cloud computing and other information technology services. As of December 31, 2018, future payments under these contractual obligations were as follows (in thousands):

2019	$	13,266
2020	7,300
2021	3,400
2022	3,400
2023	—
Thereafter	—
Total purchase obligations	$	27,366

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COMPENSATION ARRANGEMENTS (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock-Based Compensation Expense

The stock-based compensation expense related to stock awards issued under the Plans and acquisition-related awards are presented within the following line items of the consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
Cost of revenue	$	1,485	$	2,658	$	3,940
Marketing	6,948		7,949		8,929
Selling, general and administrative	56,288		70,343		96,654
Restructuring charges	—		849		4,749
Other income (expense), net	100		245		851
Total stock-based compensation expense	$	64,821	$	82,044	$	115,123

We recognized stock-based compensation from discontinued operations of $0.2 million and $3.1 million for the years ended December 31, 2017 and 2016. We also capitalized $7.4 million, $6.2 million, and $9.3 million of stock-based compensation for the years ended December 31, 2018, 2017 and 2016, in connection with internally-developed software. As of December 31, 2018, $95.2 million of unrecognized compensation costs related to unvested employee stock awards are expected to be recognized over a remaining weighted-average period of 1.35 years.

Schedule of Restricted Stock Unit Activity

The table below summarizes restricted stock unit activity under the Plans for the year ended December 31, 2018:

	Restricted Stock Units			Weighted- Average Grant Date Fair Value (per share)
Unvested at December 31, 2017	$	28,939,110		$	4.32
Granted	19,376,465			4.59
Vested	(15,226,639		)	4.46
Forfeited	(6,465,504		)	4.31
Unvested at December 31, 2018	$	26,623,432		$	4.47

Schedule of Stock Option Activity

The table below summarizes the stock option activity for the year ended December 31, 2018:

	Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands) (1)
Outstanding and exercisable at December 31, 2017	$	885,580		$	0.62	1.76	$	3,967
Exercised	(672,793		)	0.12
Forfeited	—			—
Outstanding and exercisable at December 31, 2018	$	212,787		1.80		1.37	$	298

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REVENUE RECOGNITION (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Schedule of Prospective Adoption of New Accounting Pronouncements

	December 31, 2018
	As reported		Effects of Topic 606			Balances without adoption of Topic 606
Total assets	$	1,642,142	$	(10,948	)	$	1,631,194
Total liabilities	1,259,531		103,878			1,363,409
Total equity	382,611		(114,826		)	267,785

Consolidated Statements of Operations

	Year Ended December 31, 2018
	As reported			Effects of Topic 606			Balances without adoption of Topic 606
Revenue:
Service revenue (1)	$	1,205,487		$	522		$	1,206,009
Product revenue	1,431,259			—			1,431,259
Total revenue	2,636,746			522			2,637,268
Cost of revenue:
Service cost of revenue (2)	120,077			25,436			145,513
Product cost of revenue	1,196,068			—			1,196,068
Cost of revenue (2)	1,316,145			25,436			1,341,581
Gross profit	1,320,601			(24,914		)	1,295,687
Operating expenses:
Marketing (3)	395,737			7,867			403,604
Selling, general and administrative (4)	870,961			(3,092		)	867,869
Restructuring charges	(136		)	—			(136		)
Total operating expenses	1,266,562			4,775			1,271,337
Income (loss) from operations	54,039			(29,689		)	24,350
Other income (expense), net	(53,008		)	—			(53,008		)
Income (loss) before provision (benefit) for income taxes	1,031			(29,689		)	(28,658		)
Provision (benefit) for income taxes (5)	(957		)	(803		)	(1,760		)
Net income (loss)	$	1,988		$	(28,886	)	$	(26,898	)

(1) For the year ended December 31, 2018, the adoption of Topic 606 resulted in a $33.3 million decrease to Revenue for refunds on service revenue transactions for which the merchant's share is not recoverable and customer credits issued for relationship purposes, partially offset by increases of $27.2 million related to the timing of recognition of variable consideration from unredeemed vouchers, $2.6 million related to the timing of recognition of revenue from hotel reservation offerings and $3.0 million related to the timing of recognition of breakage revenue from customer credits that are not expected to be used.

(2) Reflects decreases to Cost of revenue following the adoption of Topic 606 for refunds on service revenue transactions for which the merchant's share is not recoverable.

(3) Reflects decreases to Marketing expense following the adoption of Topic 606 for customer credits issued for relationship purposes.

(4) Reflects increases to Selling, general and administrative expense for the amortization of deferred contract acquisition costs in excess of amounts capitalized.

(5) As discussed in Note 15, Income Taxes, for the year ended December 31, 2018, we recognized an income tax benefit of $6.4 million resulting from the impact of adopting Topic 606 on intercompany activity in certain foreign jurisdictions. That income tax benefit is not reflected in this table, which presents the direct impacts of adopting Topic 606.

Disaggregation of Revenue

Segment and Category Information

	Year Ended December 31, 2018
	As reported		Effects of Topic 606			Balances without adoption of Topic 606
North America
Service revenue:
Local	$	752,863	$	(1,050	)	$	751,813
Travel	71,856		(1,460		)	70,396
Goods	18,283		113			18,396
Product revenue - Goods	796,393		—			796,393
Total North America revenue	1,639,395		(2,397		)	1,636,998
International
Service revenue:
Local	306,700		2,286			308,986
Travel	41,183		(262		)	40,921
Goods	14,602		895			15,497
Product revenue - Goods	634,866		—			634,866
Total International revenue	997,351		2,919			1,000,270
Consolidated
Service revenue:
Local	1,059,563		1,236			1,060,799
Travel	113,039		(1,722		)	111,317
Goods	32,885		1,008			33,893
Product revenue - Goods	1,431,259		—			1,431,259
Total Consolidated Revenue	$	2,636,746	$	522		$	2,637,268

Deferred Revenue, by Arrangement, Disclosure

The following table summarizes the activity in the liability for customer credits for the year ended December 31, 2018 (in thousands):

	Customer Credits
Balance as of January 1, 2018	$	19,414
Credits issued	126,874
Credits redeemed (1)	(112,161		)
Breakage revenue recognized	(18,802		)
Foreign currency translation	(207		)
Balance as of December 31, 2018	$	15,118

(1) Customer credits can be redeemed through our online marketplaces for goods or services provided by a third-party merchant or for merchandise inventory sold by us. When customer credits are redeemed for goods or services provided by a third-party merchant, service revenue is recognized on a net basis as the difference between the carrying amount of the customer credit liability derecognized and the amount due to the merchant for the related transaction. When customer credits are redeemed for merchandise inventory sold by us, product revenue is recognized on a gross basis equal to the amount of the customer credit liability derecognized. Customer credits are primarily used within one year of issuance.

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RESTRUCTURING (Tables)

12 Months Ended

Dec. 31, 2018

Restructuring and Related Activities [Abstract]

Summary of Costs Incurred by Segment Related to Restructuring

The following tables summarize costs incurred by segment related to the restructuring plan for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31, 2018
	Employee Severance and Benefit Costs			Asset Impairments		Other Exit Costs		Total Restructuring Charges
North America	$	—		$	—	$	177	$	177
International	(353		)	—		40		(313		)
Consolidated	$	(353	)	$	—	$	217	$	(136	)

	Year Ended December 31, 2017
	Employee Severance and Benefit Costs (1)		Asset Impairments		Other Exit Costs		Total Restructuring Charges
North America	$	8,172	$	—	$	3,826	$	11,998
International	4,814		—		2,016		6,830
Consolidated	$	12,986	$	—	$	5,842	$	18,828

	Year Ended December 31, 2016
	Employee Severance and Benefit Costs (1)		Asset Impairments (2)		Other Exit Costs		Total Restructuring Charges
North America	$	8,548	$	45	$	3,304	$	11,897
International	25,499		283		2,759		28,541
Consolidated	$	34,047	$	328	$	6,063	$	40,438

(1) The employee severance and benefit costs for the years ended December 31, 2017 and 2016 related to the termination of approximately 750 and 900 employees.

(2) Asset impairments related to property, equipment and software that were determined to be impaired as a result of our restructuring activities.

Schedule of Restructuring Liability

The following table summarizes restructuring liability activity for the years ended December 31, 2018 and 2017 (in thousands):

	Employee Severance and Benefit Costs			Other Exit Costs			Total
Balance as of December 31, 2016	$	14,135		$	2,260		$	16,395
Charges payable in cash (1)	12,140			5,842			17,982
Cash payments	(23,117		)	(7,826		)	(30,943		)
Foreign currency translation	659			28			687
Balance as of December 31, 2017	$	3,817		$	304		$	4,121
Charges payable in cash	(353		)	217			(136		)
Cash payments	(2,256		)	(521		)	(2,777		)
Foreign currency translation	(89		)	—			(89		)
Balance as of December 31, 2018	$	1,119		$	—		$	1,119

(1) Excludes stock-based compensation of $0.8 million related to accelerated vesting of stock-based compensation awards for certain employees terminated as a result of our restructuring activities.

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INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

The components of pretax income (loss) from continuing operations for the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):

	Year Ended December 31,
	2018			2017		2016
United States	$	23,349		$	30,095	$	(119,095	)
International	(22,318		)	6,050		(52,432		)
Income (loss) before provision (benefit) for income taxes	$	1,031		$	36,145	$	(171,527	)

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The provision (benefit) for income taxes for the years ended December 31, 2018, 2017 and 2016 was allocated between continuing operations and discontinued operations as follows (in thousands):

	Year Ended December 31,
	2018			2017		2016
Continuing Operations	$	(957	)	$	7,544	$	(5,318	)
Discontinued Operations	—			—		2,771
Total	$	(957	)	$	7,544	$	(2,547	)

The provision (benefit) for income taxes from continuing operations for the years ended December 31, 2018, 2017 and 2016 consisted of the following components (in thousands):

	Year Ended December 31,
	2018			2017			2016
Current taxes:
U.S. federal	$	768		$	(120	)	$	(1,093	)
State	57			191			912
International	3,218			6,870			5,311
Total current taxes	4,043			6,941			5,130
Deferred taxes:
U.S. federal	(319		)	(1,335		)	(4,262		)
State	—			50			(11		)
International	(4,681		)	1,888			(6,175		)
Total deferred taxes	(5,000		)	603			(10,448		)
Provision (benefit) for income taxes	$	(957	)	$	7,544		$	(5,318	)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The items accounting for differences between the income tax provision (benefit) from continuing operations computed at the U.S. federal statutory rate and the provision (benefit) for income taxes for the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):

	Year Ended December 31,
	2018			2017			2016
U.S. federal income tax provision (benefit) at statutory rate	$	216		$	12,651		$	(60,035	)
Foreign income and losses taxed at different rates (1)	2,113			4,524			9,410
State income taxes, net of federal benefits, and state tax credits	1,966			(4,980		)	(4,694		)
Change in valuation allowances	3,829			(36,057		)	13,797
Effect of income tax rate changes on deferred items (2)	1,544			20,466			7,135
Tax effects of intercompany transactions	607			3,332			853
Adjustments related to uncertain tax positions	18			1,824			(4,899		)
Non-deductible stock-based compensation expense	3,239			5,002			6,724
Tax shortfalls on stock-based compensation awards	(335		)	4,290			12,585
Non-deductible (or non-taxable) change in fair value of investment	—			—			4,484
Federal research and development credits	(8,331		)	(7,862		)	(8,547		)
Forgiveness of intercompany liabilities	(1,340		)	(2,494		)	15,187
Deductions for investments in subsidiaries that have ceased operations	—			—			(645		)
Ordinary stock loss	(11,815		)	—			—
Non-taxable gains on business dispositions	—			—			(3,481		)
Non-deductible or non-taxable items	7,332			6,848			6,808
Provision (benefit) for income taxes	$	(957	)	$	7,544		$	(5,318	)

(1) Tax rates in foreign jurisdictions were generally lower than the U.S. federal statutory rate through December 31, 2018. This results in an adverse impact to the provision (benefit) for income taxes in this rate reconciliation for the years ended December 31, 2018, 2017 and 2016, prior to the impact of valuation allowances, due to the net pretax losses from continuing operations in certain foreign jurisdictions with lower tax rates.

(2) The effect of income tax rate changes on deferred items for the year ended December 31, 2017 is primarily related to the U.S. tax reform legislation that was signed into law on December 22, 2017, which included a reduction of the U.S. Federal income tax rate to 21 percent. That rate reduction did not impact the Company's provision for income taxes for the year ended December 31, 2017 due to the valuation allowance against the Company's U.S. net deferred tax assets.

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The deferred income tax assets and liabilities consisted of the following components as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018			2017
Deferred tax assets:
Accrued expenses and other liabilities	$	25,694		$	36,786
Stock-based compensation	5,167			3,720
Net operating loss and tax credit carryforwards	206,328			208,040
Intangible assets, net	16,482			23,722
Investments	5,916			814
Unrealized foreign currency exchange losses	1,882			2,771
Other	1,021			687
Total deferred tax assets	262,490			276,540
Less: Valuation allowances	(228,023		)	(238,702		)
Deferred tax assets, net of valuation allowance	34,467			37,838
Deferred tax liabilities:
Prepaid expenses and other assets	(12,737		)	(10,011		)
Property, equipment and software, net	(12,576		)	(11,315		)
Convertible senior notes	(2,457		)	(2,773		)
Deferred revenue	(7,255		)	(10,436		)
Total deferred tax liabilities	(35,025		)	(34,535		)
Net deferred tax asset (liability)	$	(558	)	$	3,303

Summary of Income Tax Contingencies [Table Text Block]

The following table summarizes activity related to our gross unrecognized tax benefits, excluding interest and penalties, for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017			2016
Beginning Balance	$	87,359		$	80,081		$	79,637
Increases related to prior year tax positions	1,500			960			1,708
Decreases related to prior year tax positions	(21		)	(1,196		)	(3,154		)
Increases related to current year tax positions	7,533			9,571			11,443
Decreases based on settlements with taxing authorities	—			—			(3,176		)
Decreases due to lapse of statute limitations	(9,447		)	(3,777		)	(4,906		)
Foreign currency translation	713			1,720			(1,471		)
Ending Balance	$	87,637		$	87,359		$	80,081

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FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following tables summarize assets that are measured at fair value on a recurring basis as of December 31, 2018 and 2017 (in thousands):

			Fair Value Measurement at Reporting Date Using
	December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Fair value option investments	$	73,902	$	—	$	—	$	73,902
Available-for-sale securities:
Redeemable preferred shares	10,340		—		—		10,340
Liabilities:
Contingent consideration	1,529		—		—		1,529

			Fair Value Measurement at Reporting Date Using
	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents	$	137,975	$	137,975	$	—	$	—
Fair value option investments	82,966		—		—		82,966
Available-for-sale securities:
Convertible debt securities	11,354		—		—		11,354
Redeemable preferred shares	15,431		—		—		15,431

Fair Value, Assets and Liabilities, Reconciliation of Level 3 Inputs

The following table provides a roll-forward of the fair value of recurring Level 3 fair value measurements for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018			2017			2016
Assets
Fair value option investments:
Beginning Balance	$	82,966		$	82,584		$	130,725
Total gains (losses) included in earnings	(9,064		)	382			(48,141		)
Ending Balance	$	73,902		$	82,966		$	82,584
Unrealized (losses) gains still held (1)	$	(9,064	)	$	382		$	(48,141	)
Available-for-sale securities
Convertible debt securities:
Beginning Balance	$	11,354		$	10,038		$	10,116
Purchases and acquisition of convertible debt securities	—			1,612			—
Proceeds from sales and maturities of convertible debt securities	(8,594		)	(1,843		)	(1,685		)
Transfer to other equity method investment upon conversion of convertible debt security	(4,008		)	—			—
Total gains (losses) included in other comprehensive income (loss)	(1,148		)	(437		)	703
Total gains (losses) included in earnings(2)	2,396			1,984			904
Ending Balance	$	—		$	11,354		$	10,038
Unrealized gains (losses) still held (1)	$	—		$	1,303		$	1,607
Redeemable preferred shares:
Beginning Balance	$	15,431		$	17,444		$	22,834
Total gains (losses) included in other comprehensive income (loss)	379			931			(816		)
Other-than-temporary impairment included in earnings	(5,470		)	(2,944		)	—
Transfer to cost method investment classification upon elimination of redemption feature	—			—			(4,574		)
Ending Balance	$	10,340		$	15,431		$	17,444
Unrealized gains (losses) still held (1)	$	(5,091	)	$	(2,013	)	$	(816	)
Liabilities
Contingent Consideration:
Beginning Balance	$	—		$	14,588		$	10,781
Issuance of contingent consideration in connection with acquisitions	1,589			—			—
Settlements of contingent consideration liabilities	—			(7,858		)	—
Reclass to non-fair value liabilities when no longer contingent	—			(6,778		)	(285		)
Total losses (gains) included in earnings	56			48			4,092
Foreign currency translation	(116		)	—			—
Ending Balance	$	1,529		$	—		$	14,588
Unrealized losses (gains) still held (1)	$	56		$	—		$	3,966

(1) Represents the unrealized gains or losses recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.

(2) Represents a gain at maturity of a previously impaired convertible debt security, accretion of interest income and changes in the fair value of an embedded derivative.

Fair Value of Financial Assets and Liabilities not Measured at Fair Value

The following table presents the carrying amount and fair value of equity securities that were classified as cost method investments as of December 31, 2017 (in thousands):

	December 31, 2017
	Carrying Amount		Fair Value
Cost method investments (1)	$	25,438	$	32,792

(1) See Note 2, Summary of Significant Accounting Policies, and Note 7, Investments, for information about our adoption of ASU 2016-01 on January 1, 2018 and its impact on accounting for equity investments without readily determinable fair values that were previously subject to the cost method of accounting.

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INCOME (LOSS) PER SHARE (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share

The following table sets forth the computation of basic and diluted net income (loss) per share of common stock for the years ended December 31, 2018 and 2017 (in thousands, except share amounts and per share amounts):

	Year Ended December 31,
	2018			2017
Basic and diluted net income (loss) per share:
Numerator
Net income (loss) - continuing operations	$	1,988		$	28,601
Less: Net income (loss) attributable to noncontrolling interests	13,067			12,587
Net income (loss) attributable to common stockholders - continuing operations	$	(11,079	)	$	16,014
Net income (loss) attributable to common stockholders - discontinued operations	—			(1,974		)
Net income (loss) attributable to common stockholders	$	(11,079	)	$	14,040
Denominator
Shares used in computation of basic net income (loss) per share	566,511,108			559,367,075
Weighted-average effect of diluted securities:
Stock Options	—			842,047
Restricted Stock	—			488,773
Restricted Stock Units	—			7,153,674
Employee Stock Purchase Plan	—			201,504
Performance Share Units and Performance Bonus Awards	—			365,298
Shares used in computation of diluted net income (loss) per share	566,511,108			568,418,371
Basic net income (loss) per share:
Continuing operations	$	(0.02	)	$	0.03
Discontinued operations	0.00			(0.00		)
Basic net income (loss) per share	$	(0.02	)	$	0.03
Diluted net income (loss) per share:
Continuing operations	$	(0.02	)	$	0.03
Discontinued operations	0.00			(0.01		)
Diluted net income (loss) per share	$	(0.02	)	$	0.02

The following table sets forth the computation of basic and diluted loss per share of the common stock and the Class A and Class B common stock for the year ended December 31, 2016 (in thousands, except share amounts and per share amounts):

	Period from January 1, 2016 through October 31, 2016 (pre-conversion)						Period from November 1, 2016 through December 31, 2016 (post-conversion)			Year Ended December 31, 2016 (2)
	Class A			Class B			Common			Total
Basic and diluted net income (loss) per share:
Numerator
Allocation of net income (loss) - continuing operations	$	(151,284	)	$	(632	)	$	(14,293	)	$	(166,209	)
Less: Allocation of net income (loss) attributable to noncontrolling interests	9,559			40			1,665			11,264
Allocation of net income (loss) attributable to common stockholders - continuing operations	$	(160,843	)	$	(672	)	$	(15,958	)	$	(177,473	)
Allocation of net income (loss) attributable to common stockholders - discontinued operations	(7,152		)	(30		)	(9,932		)	(17,114		)
Allocation of net income (loss) attributable to common stockholders	$	(167,995	)	$	(702	)	$	(25,890	)	$	(194,587	)
Denominator
Weighted-average common shares outstanding	574,755,214			2,399,976			574,884,987			576,354,258
Basic and diluted net income (loss) per share (1):
Continuing operations	$	(0.28	)	$	(0.28	)	$	(0.03	)	$	(0.31	)
Discontinued operations	(0.01		)	(0.01		)	(0.02		)	(0.03		)
Basic and diluted net income (loss) per share	$	(0.29	)	$	(0.29	)	$	(0.05	)	$	(0.34	)

(1) The potentially dilutive impacts of a conversion of Class B to Class A shares, outstanding equity awards, warrants and convertible senior notes have been excluded from the calculation of dilutive net income (loss) per share for the years ended December 31, 2016 as their effect on net income (loss) per share from continuing operations was antidilutive.

(2) The shares of Class A and Class B common stock had equal dividend rights and converted into shares of common stock on a one-for-one basis on October 31, 2016. This full year column reflects the weighted average Class A and Class B common shares outstanding for the period from January 1, 2016 through the October 31, 2016 conversion date and the weighted average common shares outstanding for the period from November 1, 2016 through December 31, 2016 in the denominator of the basic and diluted loss per share calculations for the year ended December 31, 2016.

Schedule of Weighted-Average Potentially Dilutive Instruments

The following weighted-average potentially dilutive instruments are not included in the diluted net income (loss) per share calculations above because they would have had an antidilutive effect on the net income (loss) per share from continuing operations:

	Year Ended December 31,
	2018	2017	2016
Restricted stock units	30,552,028	8,087,545	33,480,458
Other stock-based compensation awards	2,041,099	13,000	3,850,389
Convertible senior notes	46,296,300	46,296,300	34,213,474
Warrants	46,296,300	46,296,300	29,761,907
Total	125,185,727	100,693,145	101,306,228

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SEGMENT INFORMATION (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of Revenue by Reportable Segment

The following table summarizes revenue by reportable segment and category for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
North America
Service revenue:
Local	$	752,863	$	825,579	$	762,314
Travel	71,856		78,495		82,577
Goods	18,283		16,768		9,068
Product revenue - Goods	796,393		993,326		1,297,810
Total North America revenue (1)	1,639,395		1,914,168		2,151,769
International
Service revenue:
Local	306,700		281,466		270,045
Travel	41,183		43,786		49,756
Goods	14,602		20,358		32,681
Product revenue - Goods	634,866		584,099		509,364
Total International revenue (1)	$	997,351	$	929,709	$	861,846

(1) North America includes revenue from the United States of $1,600.2 million, $1,884.7 million and $2,120.3 million for the years ended December 31, 2018, 2017 and 2016. International includes revenue from the United Kingdom of $390.4 million, $343.9 million and $321.9 million for the years ended December 31, 2018,2017 and 2016. There were no other individual countries that represented more than 10% of consolidated total revenue for the years ended December 31, 2018, 2017 and 2016. Revenue is attributed to individual countries based on the location of the customer. In prior periods, revenue was attributed to individual countries based on the domicile of the legal entities within our consolidated group that undertook those transactions. Beginning in the second quarter of 2017, we updated our attribution of revenue by country to be based on the location of the customer. Prior period revenue amounts by country have been retrospectively adjusted to reflect that change in attribution.

Schedule of Gross Profit by Reportable Segment

The following table summarizes gross profit by reportable segment and category for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
North America
Service gross profit:
Local	$	671,352	$	708,573	$	660,983
Travel	57,945		60,594		64,355
Goods	15,302		12,929		7,470
Product gross profit - Goods	146,085		145,582		152,739
Total North America gross profit	890,684		927,678		885,547
International
Service gross profit:
Local	289,427		265,348		250,435
Travel	38,132		40,288		45,191
Goods	13,252		17,910		27,976
Product gross profit - Goods	89,106		82,637		71,504
Total International gross profit	$	429,917	$	406,183	$	395,106

Schedule of Operating Income by Reportable Segment

The following table summarizes operating income by reportable segment for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017			2016
Operating income (loss) (1) (2) (3) (4) :
North America	$	19,909	$	(45	)	$	(85,423	)
International	34,130		29,480			(14,815		)
Total operating income (loss)	$	54,039	$	29,435		$	(100,238	)

(1) Includes stock-based compensation of $59.7 million, $76.1 million and $104.7 million for North America and $5.0 million, $5.7 million and $9.5 million for International for the years ended December 31, 2018, 2017 and 2016, respectively.

(2) Includes acquisition-related (benefit) expense, net of $0.7 million for International for the year ended December 31, 2018 and $5.7 million for North America for the year ended December 31, 2016.

(3) Includes restructuring charges for North America and International. See Note 14, Restructuring, for restructuring charges by segment.

(4) Includes a $34.6 million charge related to the IBM patent litigation matter for North America for the year ended December 31, 2018. See Note 10, Commitments and Contingencies, for additional information.

Schedule of Total Assets by Segment

The following table summarizes total assets by reportable segment as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
Total assets:
North America (1)	$	958,412	$	1,045,072
International (1)	683,730		632,433
Consolidated total assets	$	1,642,142	$	1,677,505

(1) North America contains assets from the United States of $940.5 million and $1,006.2 million as of December 31, 2018 and 2017. International contains assets from Ireland of $204.6 million and $219.7 million as of December 31, 2018 and 2017. There were no other individual countries that represented more than 10% of consolidated total assets as of December 31, 2018 and 2017.

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

The following table summarizes tangible property and equipment, net of accumulated depreciation and amortization, by reportable segment as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018		2017
North America (1)	$	51,032	$	63,402
International (2)	20,773		21,850
Consolidated total	$	71,805	$	85,252

(1) Substantially all tangible property and equipment within North America is located in the United States.

(2) Tangible property and equipment, net located within Ireland represented approximately 12% of our consolidated tangible property and equipment, net as of December 31, 2017. There were no other individual countries located outside of the United States that represented more than 10% of consolidated tangible property and equipment, net as of December 31, 2018 and 2017.

Property, Plant, and Equipment and Intangible Assets

Depreciation and amortization expense on property, equipment and software is classified as follows in the accompanying consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
Service cost of revenue	$	28,102	$	26,738	$	21,277
Product cost of revenue	8,467		9,900		10,616
Selling, general and administrative	64,761		78,157		85,068
Total	$	101,330	$	114,795	$	116,961

The above amounts include amortization of internally-developed software of $53.9 million, $57.0 million and $55.0 million, and amortization expense on assets under capital leases of $30.2 million, $35.2 million and $29.8 million, for the years ended December 31, 2018, 2017 and 2016.

The following summarizes property, equipment and software, net as of December 31, 2018 and 2017 (in thousands):

	December 31,
	2018			2017
Warehouse equipment	$	5,265		$	4,989
Furniture and fixtures	9,677			11,700
Leasehold improvements	50,314			49,605
Office equipment	2,261			2,690
Purchased software	8,523			32,090
Computer hardware (1)	174,700			208,659
Internally-developed software (2)	196,807			249,207
Total property, equipment and software, gross	447,547			558,940
Less: accumulated depreciation and amortization	(304,430		)	(407,795		)
Property, equipment and software, net	$	143,117		$	151,145

(1) Includes computer hardware acquired under capital leases of $120.5 million and $132.3 million as of December 31, 2018 and 2017.

(2) The net carrying amount of internally-developed software was $70.9 million and $64.5 million as of December 31, 2018 and 2017

The following table summarizes depreciation and amortization of property, equipment and software and intangible assets by reportable segment for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2018		2017		2016
North America	$	101,419	$	121,616	$	116,865
International	14,409		16,211		19,044
Consolidated total	$	115,828	$	137,827	$	135,909

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QUARTERLY RESULTS (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Table Text Block]

The results of operations of any quarter are not necessarily indicative of the results that may be expected for any future period (in thousands, except share and per share amounts).

	Quarter Ended
	Dec. 31,		Sept. 30,		June 30,			Mar. 31,			Dec. 31,			Sept. 30,			June 30,			Mar. 31,
	2018		2018 (2)		2018 (2)			2018			2017			2017			2017			2017
Consolidated Statements of Operations Data:
Revenue	$	799,927	$	592,883	$	617,396		$	626,540		$	873,166		$	634,466		$	662,619		$	673,626
Cost of revenue	433,858		286,894		293,738			301,655			486,248			325,041			334,552			364,175
Gross profit	366,069		305,989		323,658			324,885			386,918			309,425			328,067			309,451
Income (loss) from operations	61,876		53,023		(64,245		)	3,385			49,726			(1,213		)	(7,398		)	(11,680		)
Income (loss) from continuing operations (1)	49,862		47,175		(92,254		)	(2,795		)	51,071			3,802			(5,403		)	(20,869		)
Income (loss) from discontinued operations, net of tax	—		—		—			—			(223		)	(862		)	(1,376		)	487
Net income (loss) attributable to Groupon, Inc.	46,228		44,615		(95,034		)	(6,888		)	47,721			59			(9,326		)	(24,414		)
Basic net income (loss) per share (3) :
Continuing operations	$	0.08	$	0.08	$	(0.17	)	$	(0.01	)	$	0.09		$	0.00		$	(0.01	)	$	(0.04	)
Discontinued operations	0.00		0.00		0.00			0.00			(0.00		)	(0.00		)	(0.01		)	0.00
Basic net income (loss) per share	$	0.08	$	0.08	$	(0.17	)	$	(0.01	)	$	0.09		$	0.00		$	(0.02	)	$	(0.04	)
Diluted net income (loss) per share (3):
Continuing operations	$	0.08	$	0.08	$	(0.17	)	$	(0.01	)	$	0.08		$	0.00		$	(0.01	)	$	(0.04	)
Discontinued operations	0.00		0.00		0.00			0.00			(0.00		)	(0.00		)	(0.01		)	0.00
Diluted net income (loss) per share	$	0.08	$	0.08	$	(0.17	)	$	(0.01	)	$	0.08		$	0.00		$	(0.02	)	$	(0.04	)

XML

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Details)	12 Months Ended			17 Months Ended
	Dec. 31, 2018	Dec. 31, 2017 segment	Dec. 31, 2016 segment	Mar. 31, 2018 numberofcountries
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Reportable Segments	2	2	3
Number of Countries in which Entity Operates				11

XML

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from AOCI, Current Period, Tax	$ 200
Cumulative effect of change in accounting principle, net of tax	88,945
Amortization	25,000
Accounting Standards Update 2016-16 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle, net of tax		$ (3,234)
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle, net of tax			$ (3,131)
Increase to net cash used in operating activities				$ 7,600
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to net cash used in operating activities		$ 7,000	$ 1,300
Prepaid Expenses and Other Current Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Costs	3,000
Other Noncurrent Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Costs	$ 11,000
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible assets, useful life	10 years
Maximum | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to net cash used in operating activities	$ 115,000
Maximum | Computer Equipment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Maximum | Furniture and Fixtures [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible assets, useful life	1 year
Minimum | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to net cash used in operating activities	$ 100,000
Minimum | Computer Equipment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Minimum | Furniture and Fixtures [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Software Development [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible assets, useful life	2 years
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue, Performance Obligation, Description of Payment Terms	$ 13,700

XML

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Cumulative effect of change in accounting principle, net of tax	$ 88,945
Cash and cash equivalents	841,021	$ 880,129	$ 862,977
Restricted cash included in prepaid expenses and other current assets	3,320	4,932	5,769
Restricted cash included in other non-current assets	387	420	6,160
Cash, cash equivalents and restricted cash	$ 844,728	$ 885,481	$ 874,906	$ 835,167

XML

DISCONTINUED OPERATIONS AND OTHER BUSINESS DISPOSITIONS (Details) $ in Thousands			3 Months Ended																12 Months Ended					17 Months Ended
		May 09, 2016 USD ($)	Dec. 31, 2018 USD ($) numberofcountries		Sep. 30, 2018 USD ($)	[1],[2]	Jun. 30, 2018 USD ($)	[1],[2]	Mar. 31, 2018 USD ($)	[1]	Dec. 31, 2017 USD ($)		Sep. 30, 2017 USD ($)		Jun. 30, 2017 USD ($)		Mar. 31, 2017 USD ($)		Dec. 31, 2018 USD ($) numberofcountries	Dec. 31, 2017 USD ($)		Dec. 31, 2016 USD ($)		Mar. 31, 2018 numberofcountries
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Countries in which Entity Operates | numberofcountries			15																15
Number of Countries Exited in connection with Discontinued Operations | numberofcountries																								11
Gain (Loss) on Disposition of Intangible Assets																			$ 0	$ 17,149		$ 0
Disposal Group, Including Discontinued Operation, Additional Disclosures [Abstract]
Fair value of minority investments retained or acquired		$ 8,300																	0	2,022		13,507
Less: transaction costs																			700			$ 1,600
Noncash or Part Noncash Divestiture, Amount of Consideration Received		$ 1,300
Percentage of controlling stake																						83.00%
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues																			2,636,746	2,843,877		$ 3,013,615
Total cost of revenue																			(1,316,145)	(1,510,016)		(1,732,962)
Marketing expense																			(395,737)	(400,918)		(352,175)
Selling, general and administrative expense																			(870,961)	(901,829)		(999,677)
Restructuring													$ (11,500)		$ (4,600)		$ (2,700)		136	(18,828)		(40,438)
Other income, net																			(53,008)	6,710		(71,289)
Provision for income taxes																			0	0		2,771
Income (loss) from discontinued operations, net of tax			$ 0	[1]	$ 0		$ 0		$ 0		$ (223)	[1]	$ (862)	[1]	$ (1,376)	[1]	$ 487	[1]	0	(1,974)	[3],[4]	(17,114)	[3]
Service
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues																			1,205,487	1,266,452		1,206,441
Total cost of revenue																			(120,077)	(160,810)		(150,031)
Product
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues																			1,431,259	1,577,425		1,807,174
Total cost of revenue																			(1,196,068)	(1,349,206)		(1,582,931)
Discontinued Operations, Disposed of by Sale
Disposal Group, Including Discontinued Operation, Additional Disclosures [Abstract]
Fair value of minority investments retained or acquired																				2,021		2,457
Cash proceeds received																				3,462		0
Cash proceeds receivable											$ 2,000									2,000		0
Less: transaction costs																				1,394		190
Noncash or Part Noncash Divestiture, Amount of Consideration Received																				6,089		2,267
Cumulative translation gain reclassified to earnings																				14,718		(1,201)
Less: Net book value upon closing of the transactions																				14,958		754
Reclassification adjustment included in net income (loss) from discontinued operations																			0	14,718		(6,932)
Less: Indemnification liabilities																				5,365	[5]	0
Less: Unfavorable contract liability for transition services																				2,114		0
Loss on dispositions	[3]																			(1,630)	[4]	312
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Marketing expense	[3]																			(1,239)	[4]	(10,776)
Selling, general and administrative expense	[3]																			(12,007)	[4]	(72,141)
Restructuring	[3]																			(778)	[4]	(3,170)
Other income, net	[3]																			3,852	[4]	(4,818)
Income (loss) from discontinued operations before loss on dispositions and provision for income taxes	[3]																			(263)	[4]	(14,655)
Provision for income taxes	[3]																			(81)	[4]	(2,771)
Discontinued Operations, Disposed of by Sale | Service
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues	[3]																			12,602	[4]	97,105
Total cost of revenue	[3]																			(2,557)	[4]	(21,697)
Discontinued Operations, Disposed of by Sale | Product
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues	[3]																			2,962	[4]	32,634
Total cost of revenue	[3]																			(3,098)	[4]	(31,792)
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Disposal Group, Including Discontinued Operation, Additional Disclosures [Abstract]
Fair value of minority investments retained or acquired																						11,029
Cash proceeds received																						849
Cash proceeds receivable																						10,180
Less: transaction costs																						7,468
Noncash or Part Noncash Divestiture, Amount of Consideration Received																						6,249
Cumulative translation gain reclassified to earnings																						11,399
Reclassification adjustment included in net income (loss) from discontinued operations																			$ 0	$ (187)		$ (55)

[1] Income (loss) from continuing operations includes restructuring charges of $11.5 million, $4.6 million and $2.7 million for the three months ended September 30, 2017, June 30, 2017 and March 31, 2017. Restructuring charges were not material for any quarterly period during the year ended December 31, 2018 or for the three months ended December 31, 2017.

[2] Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

[3] (1)The loss from discontinued operations before gain (loss) on dispositions and provision for income taxes for the years ended December 31, 2017 and 2016 includes the results of each business through its respective disposition date.

[4] (2)Selling, general and administrative expense from discontinued operations for the year ended December 31, 2017 includes increases to contingent liabilities under indemnification agreements. See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

[5] (1)See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

XML

BUSINESS COMBINATIONS - Additional Information (Details) $ in Thousands		3 Months Ended										8 Months Ended		12 Months Ended
	Apr. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	[1]	Jun. 30, 2018 USD ($)	[1]	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Professional Fees														$ 700		$ 1,600
Contingent consideration liability incurred in connection with acquisition of business														1,589	$ 0	0
Net income (loss) attributable to parent		$ 46,228	$ 44,615		$ (95,034)		$ (6,888)	$ 47,721	$ 59	$ (9,326)	$ (24,414)			$ (11,079)	$ 14,040	$ (194,587)
Number of Businesses Acquired														1		3
LivingSocial, Inc. [Member]
Business Acquisition [Line Items]
Revenues																$ 3,070,431
Total acquisition price																0
Revenue included in current period statement of operations													$ 4,000
Net loss included in current period statement of operations													$ (9,000)
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax																$ (182,781)
Cloud Savings [Member]
Business Acquisition [Line Items]
Percentage of outstanding shares acquired	80.00%
Financing obligation incurred in connection with acquisition of business	$ 8,600
Contingent consideration liability incurred in connection with acquisition of business	1,600											$ 1,589
Total acquisition price	$ 74,556													$ 74,556
Net income (loss) attributable to parent														$ 1,100
Other acquisitions [Member]
Business Acquisition [Line Items]
Number of Businesses Acquired																2
Merchant relationships | LivingSocial, Inc. [Member]
Business Acquisition [Line Items]
Intangible assets, useful life																3 years
Merchant relationships | Cloud Savings [Member]
Business Acquisition [Line Items]
Intangible assets, useful life														6 years
Trade names | LivingSocial, Inc. [Member]
Business Acquisition [Line Items]
Intangible assets, useful life																4 years
Trade names | Cloud Savings [Member]
Business Acquisition [Line Items]
Intangible assets, useful life														8 years
Developed technology | LivingSocial, Inc. [Member]
Business Acquisition [Line Items]
Intangible assets, useful life																1 year
Developed technology | Cloud Savings [Member]
Business Acquisition [Line Items]
Intangible assets, useful life														2 years
Other Intangible Assets | Cloud Savings [Member]
Business Acquisition [Line Items]
Intangible assets, useful life														1 year

[1] Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

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BUSINESS COMBINATIONS - Summary of Fair Value of Consideration Transferred in Acquisition (Details) - USD ($) $ in Thousands			8 Months Ended	12 Months Ended
		Apr. 30, 2018	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Payments for (Proceeds from) Previous Acquisition				$ 8,391	$ 0	$ 0
Contingent consideration liability incurred in connection with acquisition of business				1,589	$ 0	$ 0
Cloud Savings [Member]
Business Acquisition [Line Items]
Cash and cash equivalents		$ 6,244
Cash			$ 64,363
Financing obligation incurred in connection with acquisition of business		8,600
Contingent consideration liability incurred in connection with acquisition of business		1,600	1,589
Total acquisition price		74,556		74,556
Accounts receivable		5,885
Prepaid expenses and other current assets		804
Property, equipment and software		226
Goodwill		46,515	$ 46,515	$ 46,515
Other intangible assets		83,841
Accounts payable		693
Accrued merchant and supplier payables		386
Accrued expenses and other current liabilities		6,130
Other non-current liabilities		2,076
Total liabilities assumed		9,285
Other Intangible Assets | Cloud Savings [Member]
Business Acquisition [Line Items]
Intangible assets acquired	[1]	687
Trade names | Cloud Savings [Member]
Business Acquisition [Line Items]
Intangible assets acquired	[1]	2,609
Developed technology | Cloud Savings [Member]
Business Acquisition [Line Items]
Intangible assets acquired	[1]	549
Merchant relationships | Cloud Savings [Member]
Business Acquisition [Line Items]
Intangible assets acquired	[1]	$ 20,322

[1] The estimated useful lives of the acquired intangible assets are 6 years for merchant relationships, 8 years for trade names, 2 years for developed technology, and 1 year for other intangible assets.

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BUSINESS COMBINATIONS - Allocation of Aggregate Acquisition Price (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	$ 5,495
Cloud Savings
Business Acquisition [Line Items]
Cash and cash equivalents	15,479
Accounts receivable	3,652
Prepaid expenses and other current assets	2,399
Property, equipment and software	1,075
Goodwill	528
Other intangible assets	51,028
Accounts payable	2,184
Accrued merchant and supplier payables	18,498
Accrued expenses and other current liabilities	25,854
Other non-current liabilities	4,492
Total liabilities assumed	51,028
Total acquisition price	0
Customer Relationships [Member] | Cloud Savings
Business Acquisition [Line Items]
Intangible assets (1) :	$ 16,200	[1]
Merchant relationships | Cloud Savings
Business Acquisition [Line Items]
Intangible assets, useful life	3 years
Intangible assets (1) :	$ 2,700	[1]
Developed technology | Cloud Savings
Business Acquisition [Line Items]
Intangible assets, useful life	1 year
Intangible assets (1) :	$ 2,500	[1]
Trade names | Cloud Savings
Business Acquisition [Line Items]
Intangible assets, useful life	4 years
Intangible assets (1) :	$ 1,000	[1]

[1] The estimated useful lives of the acquired intangible assets are 1 year for developed technology, 4 years for trade name and 3 years for merchant relationships and customer relationships.

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PROPERTY, EQUIPMENT AND SOFTWARE, NET (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Capital Leased Assets, Gross		$ 120,500	$ 132,300
Property, Plant and Equipment, Gross		447,547	558,940
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment		(304,430)	(407,795)
Property, Plant and Equipment, Net		143,117	151,145
Capitalized Computer Software, Net		70,900	64,500
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		5,265	4,989
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		9,677	11,700
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		50,314	49,605
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		2,261	2,690
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		8,523	32,090
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	[1]	174,700	208,659
Software Development [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	[2]	$ 196,807	$ 249,207

[1] Includes computer hardware acquired under capital leases of $120.5 million and $132.3 million as of December 31, 2018 and 2017.

[2] (2)The net carrying amount of internally-developed software was $70.9 million and $64.5 million as of December 31, 2018 and 2017.

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PROPERTY, EQUIPMENT AND SOFTWARE, NET Depreciation and Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Fully Depreciated Property, Plant and Equipment	$ 75,900
Capitalized Computer Software, Amortization	53,900	$ 57,000	$ 55,000
Depreciation and amortization of property, equipment and software	101,330	114,795	116,961
Capital Leases, Income Statement, Amortization Expense	30,200	35,200	29,800
Fully Amortized Internally-Developed Software	105,000
Selling, General and Administrative Expenses
Property, Plant and Equipment [Line Items]
Depreciation and amortization of property, equipment and software	64,761	78,157	85,068
Service | Cost of Sales
Property, Plant and Equipment [Line Items]
Depreciation and amortization of property, equipment and software	28,102	26,738	21,277
Product | Cost of Sales
Property, Plant and Equipment [Line Items]
Depreciation and amortization of property, equipment and software	$ 8,467	$ 9,900	$ 10,616

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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Goodwill (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($) segment	Apr. 30, 2018 USD ($)
Goodwill [Line Items]
Number of Reportable Segments		2	2	3
Goodwill		$ 325,491	$ 286,989	$ 274,551
Goodwill, Reallocation to New Segment	[1]		0
Foreign currency translation		(8,013)	12,438
North America
Goodwill [Line Items]
Goodwill		178,685	178,685	178,685
Goodwill, Reallocation to New Segment	[1]		0
Foreign currency translation		0	0
EMEA [Member]
Goodwill [Line Items]
Goodwill		0	0	89,747
Goodwill, Reallocation to New Segment	[1]		(89,747)
Foreign currency translation		0	0
Rest of World [Member]
Goodwill [Line Items]
Goodwill		0	0	6,119
Goodwill, Reallocation to New Segment	[1]		(6,119)
Goodwill		0
Foreign currency translation		0	0
International
Goodwill [Line Items]
Goodwill		146,806	108,304	$ 0
Goodwill, Reallocation to New Segment	[1]		95,866
Foreign currency translation		(8,013)	$ 12,438
Cloud Savings [Member]
Goodwill [Line Items]
Goodwill		46,515			$ 46,515
Cloud Savings [Member] | North America
Goodwill [Line Items]
Goodwill		0
Cloud Savings [Member] | EMEA [Member]
Goodwill [Line Items]
Goodwill		0
Cloud Savings [Member] | International
Goodwill [Line Items]
Goodwill		$ 46,515

[1] We updated our segments in the first quarter of 2017 to report two operating segments: North America and International. Refer to Note 19, Segment Information, for additional information on our change in reporting segments.

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INVESTMENTS - Summary of Investments (Details) - USD ($)				1 Months Ended	3 Months Ended														12 Months Ended
		May 09, 2016	May 27, 2015	Feb. 14, 2017	Dec. 31, 2018	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016	Mar. 21, 2017	Feb. 01, 2017	Jan. 03, 2017	May 12, 2016
Schedule of Equity Method Investments [Line Items]
Investments, Fair Value Disclosure					$ 84,242,000						$ 109,751,000								$ 84,242,000	$ 109,751,000
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount																			0
Assets, Current					998,629,000						1,072,448,000								998,629,000	1,072,448,000
Revenues					799,927,000	$ 592,883,000		$ 617,396,000		$ 626,540,000	873,166,000	$ 634,466,000	$ 662,619,000	$ 673,626,000
Available-for-sale Securities, Noncurrent					10,340,000						26,785,000								10,340,000	26,785,000
Equity method investments																							$ 400,000
Equity method investment, percent ownership of voting stock																										13.00%
(Gain) loss from changes in fair value of investments																			(9,064,000)	382,000		$ (48,141,000)
Gross Profit					366,069,000	$ 305,989,000		$ 323,658,000		$ 324,885,000	386,918,000	$ 309,425,000	$ 328,067,000	309,451,000					1,320,601,000	1,333,861,000		1,280,653,000
Liabilities, Current					957,174,000						1,133,499,000								957,174,000	1,133,499,000
Liabilities, Noncurrent					100,688,000						102,408,000								100,688,000	102,408,000
Noncash or Part Noncash Acquisition, Investments Acquired		$ 8,300,000																	0	2,022,000		13,507,000
Disposition of Intangible Assets, Gross Consideration Received		16,000,000
Sale of Stock, Consideration Received on Transaction		14,700,000
Noncash or Part Noncash Divestiture, Amount of Consideration Received		1,300,000
Gain (Loss) on Disposition of Business		$ 7,600,000																	0	0		11,399,000
Redeemable Preferred Stock
Schedule of Equity Method Investments [Line Items]
Available-for-sale Securities, Noncurrent					10,340,000						15,431,000								10,340,000	15,431,000
Fair Value Option Investments
Schedule of Equity Method Investments [Line Items]
Equity method investments					73,902,000						82,966,000								73,902,000	82,966,000
Other Equity Investments
Schedule of Equity Method Investments [Line Items]
Equity method investments	[2]				$ 24,273,000						$ 25,438,000								$ 24,273,000	$ 25,438,000
Minimum
Schedule of Equity Method Investments [Line Items]
Available for sale securities, percent ownership of voting stock					19.00%						19.00%								19.00%	19.00%
Minimum | Fair Value Option Investments
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock					10.00%						10.00%								10.00%	10.00%
Minimum | Other Equity Investments
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock					1.00%						1.00%								1.00%	1.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Available for sale securities, percent ownership of voting stock					25.00%						25.00%								25.00%	25.00%
Maximum | Fair Value Option Investments
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock					19.00%						19.00%								19.00%	19.00%
Maximum | Other Equity Investments
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock					19.00%						19.00%								19.00%	19.00%
Investments [Member] | Convertible Debt Securities
Schedule of Equity Method Investments [Line Items]
Available-for-sale Securities, Noncurrent					$ 0						$ 11,354,000								$ 0	$ 11,354,000
Monster LP
Schedule of Equity Method Investments [Line Items]
Assets, Current					85,844,000						174,051,000								85,844,000	174,051,000
Revenues																			416,042,000	280,612,000		216,119,000
Equity method investments					69,400,000						78,900,000								69,400,000	78,900,000
Fair-Value Option Investments, Recapitalization Transaction, Ownership Percentage Outstanding																								9.00%
(Gain) loss from changes in fair value of investments																			(9,509,000)	249,000		(35,350,000)
Gross Profit																			27,838,000	37,773,000		24,774,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest																			(132,276,000)	(124,873,000)		(153,882,000)
Equity Method Investment, Summarized Financial Information, Net Income (Loss)																			(132,276,000)	(124,873,000)		(153,882,000)
Assets, Noncurrent					482,505,000						520,105,000								482,505,000	520,105,000
Liabilities, Current					432,133,000						438,988,000								432,133,000	438,988,000
Liabilities, Noncurrent					78,434,000						60,977,000								78,434,000	60,977,000
Nearbuy
Schedule of Equity Method Investments [Line Items]
Assets, Current					5,286,000						41,000								5,286,000	41,000
Revenues																			6,016,000	3,839,000		3,024,000
Equity method investments					4,500,000						4,000,000								4,500,000	4,000,000
Proceeds from Contributed Capital														$ 3,000,000								17,000,000
Preferred Stock, Liquidation Preference, Value																									$ 20,000,000
(Gain) loss from changes in fair value of investments																			445,000	133,000		(12,791,000)
Gross Profit																			5,857,000	3,405,000		2,570,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest																			(13,594,000)	15,122,000	[3]	(15,701,000)
Equity Method Investment, Summarized Financial Information, Net Income (Loss)																			(13,594,000)	15,122,000	[3]	$ (15,701,000)
Assets, Noncurrent					46,940,000						18,362,000								46,940,000	18,362,000
Liabilities, Current					4,015,000						0								4,015,000	0
Liabilities, Noncurrent					144,000						$ 0								144,000	0
Gain (Loss) on Sale of Equity Investments																				$ 22,600,000
Monster LP
Schedule of Equity Method Investments [Line Items]
Proceeds from Sale of Interest in Partnership Unit			$ 350,000,000
Capital Unit, Class A [Member] | Monster LP
Schedule of Equity Method Investments [Line Items]
Proceeds from Sale of Interest in Partnership Unit			$ 285,000,000
Partners' Capital Account, Units, Sale of Units			70,000,000																			2,000,000
Capital Unit, Class B | Monster LP
Schedule of Equity Method Investments [Line Items]
Proceeds from Sale of Interest in Partnership Unit																	$ 4,800,000	$ 10,000,000
Partners' Capital Account, Units, Sale of Units			64,000,000														2,515,461
Equity Securities, FV-NI, Realized Gain (Loss)																	$ 100,000
Capital Units, Class C [Member] | Monster LP
Schedule of Equity Method Investments [Line Items]
Stock or Units Available for Distributions			20,321,839													20,321,839
Capital Unit, Class A-1 [Member] | Monster LP
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock																								57.00%
Fair-Value Option Investments, Recapitalization Transaction, Liquidation Preference				$ 85,000,000
Capital Unit, Class A-1 [Member] | Monster LP | Minimum
Schedule of Equity Method Investments [Line Items]
Stock or Units Available for Distributions				950,000,000
Capital Unit, Class A-1 [Member] | Monster LP | Maximum
Schedule of Equity Method Investments [Line Items]
Stock or Units Available for Distributions				1,494,000,000
Capital Unit, Class A-1 [Member] | Monster LP
Schedule of Equity Method Investments [Line Items]
Fair-Value Option Investment, Recapitalization Transaction, Shares Issued				16,609,195
Proceeds from Sale of Interest in Partnership Unit															$ 65,000,000
All Holders [Member] | Capital Unit, Class A-1 [Member] | Monster LP
Schedule of Equity Method Investments [Line Items]
Fair-Value Option Investments, Recapitalization Transaction, Liquidation Preference				$ 150,000,000
Cloud Savings [Member]
Schedule of Equity Method Investments [Line Items]
Contingent Consideration Classified as Equity, Fair Value Disclosure					$ 2,500,000														2,500,000
Revenues																			$ 12,900,000

[1] Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

[2] Represents equity investments without readily determinable fair values. Those investments were previously accounted for using the cost method of accounting. Under the cost method, investments were carried at cost and adjusted only for other-than-temporary declines in fair value, certain distributions and additional investments. We adopted the guidance in ASU 2016-01 on January 1, 2018. Under that guidance, we have elected to record equity investments without readily determinable fair values at cost adjusted for observable price changes and impairments. There were no adjustments for observable price changes related to these investments for the year ended December 31, 2018. See further discussion under Other Equity Investments below.

[3] (1)Nearbuy's income before income taxes and net income for the year ended December 31, 2017 includes a $22.6 million gain from the sale of its subsidiary Nearbuy India Pte Ltd.

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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	May 09, 2016	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 15, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Fully Amortized Intangible Assets			$ 77,400
Gain (Loss) on Disposition of Intangible Assets			0	$ 17,149	$ 0
Proceeds from sale of intangible assets			1,500	18,333	0
Gross Carrying Value			107,570	147,194
Accumulated Amortization			62,169	127,998
Net Carrying Value			45,401	19,196
Disposition of Intangible Assets, Gross Consideration Received	$ 16,000
Professional Fees			700		$ 1,600
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value			16,200	56,749
Accumulated Amortization			11,700	46,513
Net Carrying Value			4,500	10,236
Merchant relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value			21,554	11,598
Accumulated Amortization			4,105	9,853
Net Carrying Value			17,449	1,745
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value			9,476	12,077
Accumulated Amortization			6,799	10,469
Net Carrying Value			2,677	1,608
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value			13,825	36,864
Accumulated Amortization			13,485	36,864
Net Carrying Value			340	0
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value			20,508	19,031
Accumulated Amortization			16,451	15,204
Net Carrying Value			4,057	3,827
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value			26,007	10,875
Accumulated Amortization			9,629	9,095
Net Carrying Value			$ 16,378	$ 1,780
OrderUp Intangible [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gain (Loss) on Disposition of Intangible Assets		$ 17,100
Proceeds from sale of intangible assets		19,800
Disposition of Intangible Assets, Gross Consideration Received		20,000
Professional Fees		$ 200
Other Intangible Assets, Net						$ 2,700
Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life			1 year
Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life			10 years

XML

INVESTMENTS - Schedule of Activity for Available For Sale Securities (Details) $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Noncurrent	$ 10,340	$ 26,785
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions		1
Available-for-sale securities, Amortized Cost	9,961	$ 25,636
Available-for-sale securities, Gross Unrealized Gain	379	1,653
Available-for-sale securities, Gross Unrealized Loss	0	(504)	[1]
Available-for-sale securities, Fair Value	(10,340)	(26,785)
Convertible Debt Securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, Amortized Cost	0	10,205
Available-for-sale securities, Gross Unrealized Gain	0	1,653
Available-for-sale securities, Gross Unrealized Loss	0	(504)	[1]
Available-for-sale securities, Fair Value	0	(11,354)
Redeemable Preferred Stock
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Noncurrent	10,340	15,431
Available-for-sale securities, Amortized Cost	9,961	15,431
Available-for-sale securities, Gross Unrealized Gain	379	0
Available-for-sale securities, Gross Unrealized Loss	0	0	[1]
Available-for-sale securities, Fair Value	(10,340)	(15,431)
Investments [Member] | Convertible Debt Securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Noncurrent	$ 0	$ 11,354

[1] Gross unrealized loss is related to one security that was in a loss position for greater than 12 months as of December 31, 2017.

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GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	May 09, 2016	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 15, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net			$ 45,401	$ 19,196
Gain (Loss) on Disposition of Intangible Assets			0	17,149	$ 0
Proceeds from sale of intangible assets			1,500	18,333	0
Disposition of Intangible Assets, Gross Consideration Received	$ 16,000
Professional Fees			700		1,600
Amortization of acquired intangible assets			$ 14,498	$ 23,032	$ 18,948
Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life			1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life			10 years
OrderUp Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gain (Loss) on Disposition of Intangible Assets		$ 17,100
Proceeds from sale of intangible assets		19,800
Disposition of Intangible Assets, Gross Consideration Received		20,000
Professional Fees		$ 200
Other Intangible Assets, Net						$ 2,700

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INVESTMENTS - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended
		Feb. 14, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016	Mar. 21, 2017	May 12, 2016
Schedule of Equity Method Investments [Line Items]
Assets, Current				$ 998,629	$ 1,072,448
Cost-method Investments, Other than Temporary Impairment				4,600
Proceeds from Sale of Debt Securities, Available-for-sale				8,600
Impairments of investments				10,156	2,944		$ 0
Available-for-sale Securities, Noncurrent				10,340	26,785
Equity Method Investment, Ownership Percentage									13.00%
Investments (including $84,242 and $109,751 at December 31, 2018 and December 31, 2017 at fair value)				108,515	135,189
Fair value of investments								$ 400
(Gain) loss from changes in fair value of investments				(9,064)	382		(48,141)
Monster LP
Schedule of Equity Method Investments [Line Items]
Assets, Current				85,844	174,051
Equity Method Investment, Summarized Financial Information, Net Income (Loss)				(132,276)	(124,873)		(153,882)
Assets, Noncurrent				482,505	520,105
Fair value of investments				69,400	78,900
(Gain) loss from changes in fair value of investments				(9,509)	249		(35,350)
Nearbuy
Schedule of Equity Method Investments [Line Items]
Assets, Current				5,286	41
Equity Method Investment, Summarized Financial Information, Net Income (Loss)				(13,594)	15,122	[1]	(15,701)
Assets, Noncurrent				46,940	18,362
Fair value of investments				4,500	4,000
(Gain) loss from changes in fair value of investments				445	133		(12,791)
Proceeds from Contributed Capital			$ 3,000				$ 17,000
Other Income (Expense)
Schedule of Equity Method Investments [Line Items]
Impairments of investments				5,600	2,900
Other Equity Investments
Schedule of Equity Method Investments [Line Items]
Fair value of investments	[2]			24,273	25,438
Fair Value Option Investments
Schedule of Equity Method Investments [Line Items]
Fair value of investments				$ 73,902	$ 82,966
Monster LP | Capital Unit, Class B
Schedule of Equity Method Investments [Line Items]
Fair-Value Option Investment, Recapitalization Transaction, Shares Exchanged		61,484,539

[1] (1)Nearbuy's income before income taxes and net income for the year ended December 31, 2017 includes a $22.6 million gain from the sale of its subsidiary Nearbuy India Pte Ltd.

[2] Represents equity investments without readily determinable fair values. Those investments were previously accounted for using the cost method of accounting. Under the cost method, investments were carried at cost and adjusted only for other-than-temporary declines in fair value, certain distributions and additional investments. We adopted the guidance in ASU 2016-01 on January 1, 2018. Under that guidance, we have elected to record equity investments without readily determinable fair values at cost adjusted for observable price changes and impairments. There were no adjustments for observable price changes related to these investments for the year ended December 31, 2018. See further discussion under Other Equity Investments below.

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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
2019	$ 13,807
2020	7,535
2021	6,811
2022	6,495
2023	5,346
Thereafter	5,407
Finite-Lived Intangible Assets, Net	$ 45,401	$ 19,196

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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION - Schedule of Other Income (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract]
Interest income	$ 6,420	$ 3,287	$ 1,808
Interest expense	(21,909)	(20,680)	(15,912)
Gains (losses), net on changes in fair value of investments	(9,064)	382	(48,141)
Gain on sale of investment	0	7,624	0
Foreign currency gains (losses), net	(20,325)	18,634	(6,927)
Impairments of investments	(10,156)	(2,944)	0
Other	2,026	407	(2,117)
Other income (expense), net	$ (53,008)	$ 6,710	$ (71,289)

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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION - Schedule of Prepaid and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract]
Merchandise inventories	$ 33,739	$ 25,528
Prepaid expenses	28,209	40,399
Income taxes receivable	6,717	10,299
Other	19,450	17,799
Total prepaid expenses and other current assets	$ 88,115	$ 94,025

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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION - Schedule of Accrued Merchant and Supplier Payables (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract]
Accrued merchant payables		$ 371,279	$ 459,662
Accrued supplier payables (1)	[1]	280,502	310,673
Total accrued merchant and supplier payables		$ 651,781	$ 770,335

[1] Amounts include payables to suppliers of inventories and providers of shipping and fulfillment services.

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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION - Schedule of Accrued Expense and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract]
Refunds reserve	$ 27,957		$ 31,275
Compensation and benefits	56,173		73,096
Accrued marketing	39,094		32,912
Customer credits	15,118		28,487
Income taxes payable	8,987		9,645
Deferred revenue	25,452	$ 25,800	29,539
Current portion of capital lease obligations	17,207		25,958
Other	77,046		100,284
Total accrued expenses and other current liabilities	$ 267,034		$ 331,196

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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION - Schedule of Other Non-current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract]
Contingent income tax liabilities	$ 39,858	$ 43,699
Deferred rent	32,186	29,032
Capital lease obligations	12,481	18,500
Deferred income taxes	6,619	811
Other	9,544	10,366
Total other non-current liabilities	$ 100,688	$ 102,408

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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	$ 34,602	$ 31,844
Foreign currency translation	3,332	(27,287)	$ 5,988
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax	(106)	(1,341)	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax	0	583	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	0	2	116
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	106	(12,717)	(493)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustments, beginning balance	30,962	58,249	52,261
Reclassification for impact of U.S. tax rate change	0
Other comprehensive income (loss)	3,332	(27,287)	5,988
Foreign currency translation adjustments, ending balance	34,294	30,962	58,249
Foreign currency translation	3,332
Net unrealized gain (loss) during the period		(12,382)	6,579
Reclassification adjustment included in income (loss) from discontinued operations	0	14,905	591
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	(14,905)	(591)
Unrealized gain (loss) on available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification for impact of U.S. tax rate change	161
Other comprehensive income (loss)	(735)	494	(70)
Unrealized gain (loss) on available-for-sale securities, beginning balance	882	388	458
Unrealized gain (loss) on available-for-sale securities, ending balance	308	882	388
Net unrealized gain (loss) during the period		(1,109)	(70)
Reclassification adjustment included in income (loss) from discontinued operations		(1,603)	0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	0	2,944	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	106	1,603	0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	0	0	(585)	$ (1,513)
Reclassification for impact of U.S. tax rate change	0
Other comprehensive income (loss)	0	585	928
Foreign currency translation	0
Net unrealized gain (loss) during the period		0	830
Reclassification adjustment included in income (loss) from discontinued operations		(585)	(98)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax		585
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification for impact of U.S. tax rate change	161
Other comprehensive income (loss)	2,597	(26,208)	6,846
Accumulated other comprehensive income	34,602	31,844	58,052	$ 51,206
Foreign currency translation	3,332	(27,287)	5,988
Net unrealized gain (loss) during the period	2,491	(13,491)	7,339
Reclassification adjustment included in income (loss) from discontinued operations	(106)	12,717	493
Continuing Operations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	2,597	(9,697)	9,219
Foreign currency translation	3,332	(10,776)	8,361
Net unrealized gain (loss) during the period	(841)	(1,109)	(70)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	(7,468)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(106)	(1,603)	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	0	(585)	(928)
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment included in income (loss) from discontinued operations	0	187	55
Discontinued Operations, Disposed of by Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	0	(18,485)	(19,487)
Net unrealized gain (loss) during the period	0	(1,793)	(9,305)
Reclassification adjustment included in income (loss) from discontinued operations	0	(14,718)	6,932
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Tax	0	0	0
Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	0	$ 0	(18)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax	$ 0		$ 98

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FINANCING ARRANGEMENTS - Schedule of Notes (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Convertible Debt, Fair Value Disclosures	$ 257,100	$ 285,600
Principal amount	250,000	250,000
Less: debt discount	(48,331)	(60,247)
Net carrying amount of liability component	201,669	189,753
Additional Paid-In Capital
Debt Instrument [Line Items]
Net carrying amount of equity component	$ 67,014	$ 67,014

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FINANCING ARRANGEMENTS - Schedule of Convertible Debt Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Contractual interest (3.25% of the principal amount per annum)	$ 8,128	$ 8,128	$ 6,095
Amortization of debt discount	11,916	10,758	7,376
Total	$ 20,044	$ 18,886	$ 13,471

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FINANCING ARRANGEMENTS - Convertible Senior Notes (Details)		1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 04, 2016 USD ($) $ / shares shares	Apr. 20, 2020 number_of_day	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($) $ / shares
Debt Instrument [Line Items]
Net proceeds				$ 243,200,000
Stated interest rate	3.25%
Principal amount converted initially	$ 1,000
Number of shares converted (in shares) | shares	185.1852
Conversion price (in usd per share) | $ / shares	$ 5.40
Common stock, par value (in usd per share) | $ / shares						$ 3.20
Closing price of stock, trigger price (in usd per share)	150.00%
Effective interest rate				9.75%
Debt related commitment fees and issuance costs				$ 6,800,000
Debt issuance costs				4,800,000
Equity component of convertible debt			$ 2,000,000		$ 67,014,000
Estimated fair value of convertible notes				$ 285,600,000		$ 257,100,000
Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount of convertible senior notes	$ 250,000,000
Subsequent Event
Debt Instrument [Line Items]
Number of threshold trading days		20
Consecutive trading days | number_of_day		30

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FINANCING ARRANGEMENTS - Note Hedges and Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended	12 Months Ended
	May 09, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2016
Debt Disclosure [Abstract]
Cost of convertible note hedges		$ 59,100
Number of shares available to be purchased (in shares)	46.3
Strike price (in usd per share)	$ 5.40
Proceeds from issuance of warrants			$ 0	$ 0	$ 35,495
Incremental common shares attributable to dilutive effect				46.3
Exercise price (in usd per share)				$ 8.50			$ 8.50
Line of Credit Facility, Maximum Borrowing Capacity			$ 250,000			$ 250,000

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FINANCING ARRANGEMENTS - Revolving Credit Facility (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Apr. 04, 2016
Debt Instrument [Line Items]
Aggregate principal amount	$ 250.0	$ 250.0
Stated interest rate				3.25%
Unrestricted cash covenant amount	400.0
Amount of accounts held with lenders	200.0
Outstanding amount of lines of credit	$ 19.2		$ 22.7
Minimum
Debt Instrument [Line Items]
Unused commitment fee percentage	0.25%
Maximum
Debt Instrument [Line Items]
Unused commitment fee percentage	0.40%
Letter of Credit
Debt Instrument [Line Items]
Aggregate principal amount	$ 45.0
Letter of Credit | Base Rate | Minimum
Debt Instrument [Line Items]
Stated interest rate	0.50%
Letter of Credit | Base Rate | Maximum
Debt Instrument [Line Items]
Stated interest rate	2.25%
Geographic Distribution, Domestic
Debt Instrument [Line Items]
Outstanding stock percentage	100.00%
Geographic Distribution, Foreign
Debt Instrument [Line Items]
Outstanding stock percentage	65.00%

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COMMITMENTS AND CONTINGENCIES - Schedule of Future Minimum Rental Payments and Long-term Purchase Commitment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Mar. 09, 2017
Loss Contingencies [Line Items]
Capital Leases, Future Minimum Payments Due, Next Twelve Months	$ 18,169
Leases [Abstract]
Remaining amounts in 2018	32,533
Capital Leases, Future Minimum Payments Due in Two Years	7,634
2019	31,116
Capital Leases, Future Minimum Payments Due in Three Years	4,784
2020	26,876
Capital Leases, Future Minimum Payments Due in Four Years	687
2021	26,097
Capital Leases, Future Minimum Payments Due in Five Years	0
2022	21,944
Capital Leases, Future Minimum Payments Due Thereafter	0
Thereafter	31,633
Capital Leases, Future Minimum Payments Due	31,274
Total minimum lease payments	170,199
Capital Leases, Future Minimum Payments, Interest Included in Payments	(1,586)
Other Contractual Commitments [Abstract]
Remaining amounts in 2018	13,266
2019	7,300
2020	3,400
2021	3,400
2022	0
Total	27,366
Maximum exposure of indemnification liability	18,000
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	29,688
Capital Lease Obligations, Current	(17,207)	$ (25,958)
Capital Lease Obligations	$ 12,481
Groupon Latin America [Member]
Other Contractual Commitments [Abstract]
Estimated indemnification liability			$ 5,400

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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Sep. 28, 2018	Jul. 27, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2018	Mar. 09, 2017
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months					$ 13,266
Purchase Obligation, Due in Second Year					7,300
Purchase Obligation, Due in Third Year					3,400
Purchase Obligation, Due in Fourth Year					3,400
Purchase Obligation, Due in Fifth Year					0
Purchase Obligation, Due after Fifth Year					0
Purchase Obligation					27,366
Indemnification Liability, Maximum Exposure					18,000
IBM Patent Litigation Case
Loss Contingencies [Line Items]
Awarded damages		$ 82,500
Litigation Settlement, Amount Awarded from Other Party	$ 57,500
Gain (Loss) Related to Litigation Settlement			$ 40,400	$ 75,000	34,600
Finite-lived Intangible Assets Acquired					$ 15,400
Groupon Latin America [Member]
Loss Contingencies [Line Items]
Indemnification Liability						$ 5,400

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COMMITMENTS AND CONTINGENCIES - Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense, Net	$ 40,100	$ 42,500	$ 45,400
Operating Leases, Income Statement, Sublease Revenue	6,500	$ 7,100	$ 2,700
Capital Leases, Future Minimum Payments Due	31,274
Corporate, Non-Segment [Member]
Operating Leased Assets [Line Items]
Capital Leases, Future Minimum Payments Due	$ 87,500

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COMMITMENTS AND CONTINGENCIES - Subleases (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Subleases [Abstract]
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Next Twelve Months	$ 5,206
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Two Years	5,027
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Three Years	5,065
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Four Years	5,103
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Five Years	4,385
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Thereafter	4,891
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals	$ 29,677

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STOCKHOLDERS' EQUITY (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016	Apr. 30, 2018
Class of Stock [Line Items]
Preferred Stock, Capital Shares Reserved for Future Issuance	50,000,000
Preferred Stock, Shares Outstanding	0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	2,010,000,000
Stock Repurchase Program, Authorized Amount	$ 300.0		$ 700.0
Common Stock
Class of Stock [Line Items]
Common Stock, Voting Rights	1
Common Class A [Member]
Class of Stock [Line Items]
Common Stock, Voting Rights		1
Stock Repurchased During Period, Shares	3,252,886
Stock Repurchased During Period, Value	$ 10.0
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	290,000,000
Common Class B [Member]
Class of Stock [Line Items]
Common Stock, Voting Rights		150

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COMPENSATION ARRANGEMENTS - Additional Information (Details) - USD ($)		9 Months Ended		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 3,200,000	$ 4,000,000	$ 1,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number					1,200,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options				212,787	885,580
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term				1 year 4 months 15 days	1 year 9 months 3 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 5	$ 3.78
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Issuable				1,261,730
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value				$ 6,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized				7,972,780
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period				0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value					$ 4.10	$ 3.93
Stock Issued During Period, Value, Restricted Stock Award, Gross				$ 64,100,000	$ 67,000,000	$ 88,200,000
Stock-based compensation				$ 64,821,000	82,044,000	115,123,000
Deferred Compensation Arrangement with Individual, Shares Issued				278,635
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				(672,793)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price				$ 0.12
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant				2,010,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				54,927,088
Preferred Stock, Capital Shares Reserved for Future Issuance				50,000,000
Stock Repurchase Program, Authorized Amount				$ 300,000,000			$ 700,000,000
Payments for Repurchase of Common Stock				9,585,000	61,233,000	165,357,000
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost		$ 7,400,000	$ 6,200,000			9,300,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 95,200,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 4 months 5 days
Carrying Amount	[1]				25,438,000
Cost of Sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation				$ 1,485,000	2,658,000	3,940,000
Selling and Marketing Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation				6,948,000	7,949,000	8,929,000
Selling, General and Administrative Expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation				56,288,000	70,343,000	96,654,000
Restructuring Charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation				0	245,000	851,000
Other Income
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation				$ 100,000	849,000	4,749,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting of restricted stock units and performance share units (in shares)				15,226,639
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period				(6,465,504)
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant				10,000,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value				$ 1,300,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value					$ 5,200,000	$ 2,200,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period				3 years
Minimum | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period				1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period				4 years
Maximum | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period				4 years
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting of restricted stock units and performance share units (in shares)				14,264,895	16,596,562	22,698,324
Stock Issued During Period, Shares, Employee Stock Purchase Plans				1,621,061	1,879,656	1,669,782
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				(672,793)	(102,803)	(491,483)
2008 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)				64,618,500
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)				20,000,000
2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)				150,000,000
Discontinued Operations, Disposed of by Sale
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation					$ 200,000	$ 3,100,000

[1] (1)See Note 2, Summary of Significant Accounting Policies, and Note 7, Investments, for information about our adoption of ASU 2016-01 on January 1, 2018 and its impact on accounting for equity investments without readily determinable fair values that were previously subject to the cost method of accounting.

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REVENUE RECOGNITION - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Amortization of Deferred Charges	$ 25,000
Deferred Revenue	25,452	$ 29,539		$ 25,800
Cumulative effect of change in accounting principle, net of tax	(88,945)
Deferred Revenue, Revenue Recognized	25,100
Total Groupon, Inc. Stockholders' Equity
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax	(88,945)	$ 3,234	$ 3,131
Total Groupon, Inc. Stockholders' Equity | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax	(88,900)
Cumulative Effect on Retained Earnings, Tax	6,700
Prepaid Expenses and Other Current Assets
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred Costs	3,000
Prepaid Expenses and Other Current Assets | Total Groupon, Inc. Stockholders' Equity | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax	4,007
Other Noncurrent Assets
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred Costs	11,000
Other Noncurrent Assets | Total Groupon, Inc. Stockholders' Equity | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax	10,223
Accrued Merchant and Supplier Payable [Member] | Total Groupon, Inc. Stockholders' Equity | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax	64,970
Accrued Liabilities [Member] | Total Groupon, Inc. Stockholders' Equity | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax	13,188
Other Noncurrent Liabilities [Member] | Total Groupon, Inc. Stockholders' Equity | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax	$ (3,443)

XML

COMPENSATION ARRANGEMENTS - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 5	$ 3.78
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value		$ 4.10	$ 3.93
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ 64.1	$ 67.0	$ 88.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	6.2
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 1.3
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	26,623,432	28,939,110
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 4.47	$ 4.32
Vesting of restricted stock units and performance share units (in shares)	15,226,639
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 4.46
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	6,465,504
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 4.31
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	19,376,465
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 4.59

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REVENUE RECOGNITION - Impact of Topic 606 on Condensed Consolidated Financial Statements (Details) - USD ($) $ in Thousands		3 Months Ended										12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016		Jan. 01, 2018	Dec. 31, 2015
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												$ 2,636,746		$ 2,843,877		$ 3,013,615
Total cost of revenue												1,316,145		1,510,016		1,732,962
Gross Profit		$ 366,069	$ 305,989		$ 323,658		$ 324,885	$ 386,918	$ 309,425	$ 328,067	$ 309,451	1,320,601		1,333,861		1,280,653
Marketing Expense												395,737		400,918		352,175
Selling, general and administrative												870,961		901,829		999,677
Restructuring charges (credits)									11,500	4,600	2,700	(136)		18,828		40,438
Total operating expenses												1,266,562		1,304,426		1,380,891
Income (loss) from operations		61,876	$ 53,023		$ (64,245)		$ 3,385	49,726	$ (1,213)	$ (7,398)	$ (11,680)	54,039	[2],[3],[4],[5]	29,435	[2],[3],[4],[5]	(100,238)	[2],[3],[4],[5]
Other income (expense), net												(53,008)		6,710		(71,289)
Income (loss) from continuing operations												1,031		36,145		(171,527)
Income tax expense (benefit)												(957)		7,544		(5,318)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest												1,988		26,627		(183,323)
Revenue recognized from unredeemed vouchers												27,200
Hotel Reservations Offerings Revenues												2,600
Breakage revenue												33,000
Increase related to refunds on service revenue transactions												3,000
Cumulative effect of change in accounting principle, net of tax												(88,945)
Assets		(1,642,142)						(1,677,505)				(1,642,142)		(1,677,505)
Deferred revenue		(25,452)						(29,539)				(25,452)		(29,539)				$ (25,800)
Deferred Revenue, Revenue Recognized												(25,100)
Liabilities		1,259,531						1,425,660				1,259,531		1,425,660
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		382,611						251,845				382,611		251,845		265,062			$ 470,587
International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	[6]											997,351		929,709		861,846
Gross Profit												429,917		406,183		395,106
Restructuring charges (credits)												(313)		6,830		28,541
Income (loss) from operations	[2],[3],[4],[5]											34,130		29,480		(14,815)
Assets	[7]	(683,730)						(632,433)				(683,730)		(632,433)
North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	[6]											1,639,395		1,914,168		2,151,769
Gross Profit												890,684		927,678		885,547
Restructuring charges (credits)												177		11,998		11,897
Income (loss) from operations	[2],[3],[4],[5]											19,909		(45)		(85,423)
Assets	[7]	(958,412)						(1,045,072)				(958,412)		(1,045,072)
Local
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												1,059,563
Local | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												306,700
Local | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												752,863
Goods
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												32,885
Goods | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												14,602
Goods | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												18,283
Travel
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												113,039
Travel | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												41,183
Travel | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												71,856
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												2,637,268
Total cost of revenue												1,341,581
Gross Profit												1,295,687
Marketing Expense												403,604
Selling, general and administrative												867,869
Restructuring charges (credits)												(136)
Total operating expenses												1,271,337
Income (loss) from operations												24,350
Other income (expense), net												(53,008)
Income (loss) from continuing operations												(28,658)
Income tax expense (benefit)												(1,760)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest												(26,898)
Assets		(1,631,194)										(1,631,194)
Liabilities		1,363,409										1,363,409
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		267,785										267,785
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												1,000,270
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												1,636,998
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Local
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												1,060,799
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Local | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												308,986
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Local | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												751,813
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Goods
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												33,893
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Goods | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												15,497
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Goods | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												18,396
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Travel
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												111,317
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Travel | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												40,921
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Travel | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												70,396
Total Groupon, Inc. Stockholders' Equity
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax												(88,945)		3,234		3,131
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		381,248						$ 250,973				381,248		250,973		264,420			$ 469,398
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												522
Total cost of revenue												25,436
Gross Profit												(24,914)
Marketing Expense	[8]											7,867
Selling, general and administrative	[9]											(3,092)
Restructuring charges (credits)												0
Total operating expenses												4,775
Income (loss) from operations												(29,689)
Other income (expense), net												0
Income (loss) from continuing operations												(29,689)
Income tax expense (benefit)	[10]											(803)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest												(28,886)
Assets		(10,948)										(10,948)
Liabilities		103,878										103,878
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ (114,826)										(114,826)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												2,919
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												(2,397)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Local
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												1,236
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Local | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												2,286
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Local | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												(1,050)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Goods
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												1,008
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Goods | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												895
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Goods | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												113
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Travel
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												(1,722)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Travel | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												(262)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Travel | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												(1,460)
Accounting Standards Update 2014-09 | Total Groupon, Inc. Stockholders' Equity
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax												(88,900)
Cumulative Effect on Retained Earnings, Tax												6,700
Accounting Standards Update 2014-09 | Prepaid Expenses and Other Current Assets | Total Groupon, Inc. Stockholders' Equity
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax												4,007
Accounting Standards Update 2014-09 | Other Noncurrent Assets | Total Groupon, Inc. Stockholders' Equity
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax												10,223
Accounting Standards Update 2014-09 | Accrued merchant and supplier payables | Total Groupon, Inc. Stockholders' Equity
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax												64,970
Accounting Standards Update 2014-09 | Accrued expenses and other current liabilities | Total Groupon, Inc. Stockholders' Equity
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax												13,188
Accounting Standards Update 2014-09 | Other non-current liabilities | Total Groupon, Inc. Stockholders' Equity
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of change in accounting principle, net of tax												(3,443)
Service
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												1,205,487		1,266,452		1,206,441
Total cost of revenue												120,077		160,810		150,031
Service | Local | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												306,700		281,466		270,045
Gross Profit												289,427		265,348		250,435
Service | Local | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												752,863		825,579		762,314
Gross Profit												671,352		708,573		660,983
Service | Goods | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												14,602		20,358		32,681
Gross Profit												13,252		17,910		27,976
Service | Goods | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												18,283		16,768		9,068
Gross Profit												15,302		12,929		7,470
Service | Travel | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												41,183		43,786		49,756
Gross Profit												38,132		40,288		45,191
Service | Travel | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												71,856		78,495		82,577
Gross Profit												57,945		60,594		64,355
Service | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												1,206,009
Total cost of revenue												145,513
Service | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	[11]											522
Total cost of revenue	[12]											25,436
Product
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												1,431,259		1,577,425		1,807,174
Total cost of revenue												1,196,068		1,349,206		1,582,931
Product | Goods
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												1,431,259
Product | Goods | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												634,866		584,099		509,364
Gross Profit												89,106		82,637		71,504
Product | Goods | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												796,393		993,326		1,297,810
Gross Profit												146,085		$ 145,582		$ 152,739
Product | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												1,431,259
Total cost of revenue												1,196,068
Product | Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Goods
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												1,431,259
Product | Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Goods | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												634,866
Product | Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Goods | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												796,393
Product | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												0
Total cost of revenue												0
Product | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Goods
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												0
Product | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Goods | International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												0
Product | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Goods | North America
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue												0
Foreign Tax Authority [Member] | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Income tax expense (benefit)												$ 6,400

[1] Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

[2] Includes a $34.6 million charge related to the IBM patent litigation matter for North America for the year ended December 31, 2018. See Note 10, Commitments and Contingencies, for additional information.

[3] Includes acquisition-related (benefit) expense, net of $0.7 million for International for the year ended December 31, 2018 and $5.7 million for North America for the year ended December 31, 2016.

[4] Includes restructuring charges for North America and International. See Note 14, Restructuring, for restructuring charges by segment.

[5] Includes stock-based compensation of $59.7 million, $76.1 million and $104.7 million for North America and $5.0 million, $5.7 million and $9.5 million for International for the years ended December 31, 2018, 2017 and 2016, respectively.

[6] North America includes revenue from the United States of $1,600.2 million, $1,884.7 million and $2,120.3 million for the years ended December 31, 2018, 2017 and 2016. International includes revenue from the United Kingdom of $390.4 million, $343.9 million and $321.9 million for the years ended December 31, 2018, 2017 and 2016. There were no other individual countries that represented more than 10% of consolidated total revenue for the years ended December 31, 2018, 2017 and 2016. Revenue is attributed to individual countries based on the location of the customer. In prior periods, revenue was attributed to individual countries based on the domicile of the legal entities within our consolidated group that undertook those transactions. Beginning in the second quarter of 2017, we updated our attribution of revenue by country to be based on the location of the customer. Prior period revenue amounts by country have been retrospectively adjusted to reflect that change in attribution.

[7] North America contains assets from the United States of $940.5 million and $1,006.2 million as of December 31, 2018 and 2017. International contains assets from Ireland of $204.6 million and $219.7 million as of December 31, 2018 and 2017. There were no other individual countries that represented more than 10% of consolidated total assets as of December 31, 2018 and 2017.

[8] Reflects decreases to Marketing expense following the adoption of Topic 606 for customer credits issued for relationship purposes.

[9] Reflects increases to Selling, general and administrative expense for the amortization of deferred contract acquisition costs in excess of amounts capitalized.

[10] As discussed in Note 15, Income Taxes, for the year ended December 31, 2018, we recognized an income tax benefit of $6.4 million resulting from the impact of adopting Topic 606 on intercompany activity in certain foreign jurisdictions. That income tax benefit is not reflected in this table, which presents the direct impacts of adopting Topic 606.

[11] For the year ended December 31, 2018, the adoption of Topic 606 resulted in a $33.3 million decrease to Revenue for refunds on service revenue transactions for which the merchant's share is not recoverable and customer credits issued for relationship purposes, partially offset by increases of $27.2 million related to the timing of recognition of variable consideration from unredeemed vouchers, $2.6 million related to the timing of recognition of revenue from hotel reservation offerings and $3.0 million related to the timing of recognition of breakage revenue from customer credits that are not expected to be used.

[12] Reflects decreases to Cost of revenue following the adoption of Topic 606 for refunds on service revenue transactions for which the merchant's share is not recoverable.

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COMPENSATION ARRANGEMENTS - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Issuable		1,261,730
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options		212,787	885,580
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		$ 1.80	$ 0.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		1 year 4 months 15 days	1 year 9 months 3 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	[1]	$ 298	$ 3,967
Exercise in stock options (in shares)		672,793
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price		$ 0.12
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period		0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price		$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 3,200	$ 4,000	$ 1,200
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years

[1] (1)The aggregate intrinsic value of options outstanding and exercisable represents the total pretax intrinsic value (the difference between the fair value of our stock on the last day of each period and the exercise price, multiplied by the number of options where the fair value exceeds the exercise price) that would have been received by the option holders had all option holders exercised their options as of December 31, 2018 and 2017, respectively.

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REVENUE RECOGNITION - Liability for Customer Credits Rollforward (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Movement in Customer Refundable Fees [Roll Forward]
Balance as of January 1, 2018	$ 19,414
Credits issued	126,874
Credits redeemed	(112,161)	[1]
Breakage revenue recognized	(18,802)
Foreign currency translation	(207)
Balance as of September 30, 2018	$ 15,118

[1] (1)Customer credits can be redeemed through our online marketplaces for goods or services provided by a third-party merchant or for merchandise inventory sold by us. When customer credits are redeemed for goods or services provided by a third-party merchant, service revenue is recognized on a net basis as the difference between the carrying amount of the customer credit liability derecognized and the amount due to the merchant for the related transaction. When customer credits are redeemed for merchandise inventory sold by us, product revenue is recognized on a gross basis equal to the amount of the customer credit liability derecognized. Customer credits are primarily used within one year of issuance.

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REVENUE RECOGNITION - Performance Obligations (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01	Dec. 31, 2018
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, expected timing	12 months
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, expected timing	18 months

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RESTRUCTURING - Summary of Costs Incurred by Segment Related to Restructuring (Details) $ in Thousands	3 Months Ended			12 Months Ended					31 Months Ended
	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) numberofcountries	Dec. 31, 2017 USD ($) employee		Dec. 31, 2016 USD ($) employee		Mar. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Stock-based compensation				$ 64,821	$ 82,044		$ 115,123
Number of countries in which operations were ceased within | numberofcountries				15
Restructuring charges (credits)	$ 11,500	$ 4,600	$ 2,700	$ (136)	$ 18,828		$ 40,438
Number of employees terminated | employee					750		900
Employee Severance and Benefit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring Costs									$ 80,100
Restructuring charges (credits)				(353)	$ 12,986	[1]	$ 34,047	[2]
Asset Impairments Related to Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring Costs									$ 7,500
Restructuring charges (credits)				0	0		328
Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)				217	5,842		6,063
North America
Restructuring Cost and Reserve [Line Items]
Stock-based compensation				59,700	76,100		104,700
Restructuring charges (credits)				177	11,998		11,897
North America | Employee Severance and Benefit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)				0	8,172	[1]	8,548	[2]
North America | Asset Impairments Related to Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)				0	0		45
North America | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)				177	3,826		3,304
International
Restructuring Cost and Reserve [Line Items]
Stock-based compensation				5,000	5,700		9,500
Restructuring charges (credits)				(313)	6,830		28,541
International | Employee Severance and Benefit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)				(353)	4,814	[1]	25,499	[2]
International | Asset Impairments Related to Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)				0	0		283
International | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)				$ 40	2,016		2,759
Facility Closing | International
Restructuring Cost and Reserve [Line Items]
Number of countries in which operations were ceased within				17
OrderUp Intangible [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs					2,600
Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Stock-based compensation				$ 0	245		$ 851
Restructuring Charges | One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Stock-based compensation					$ 800

[1] The employee severance and benefit costs for the years ended December 31, 2017 and 2016 related to the termination of approximately 750 and 900 employees.

[2] Asset impairments related to property, equipment and software that were determined to be impaired as a result of our restructuring activities

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RESTRUCTURING - Schedule of Restructuring Liability (Details) - USD ($) $ in Thousands	12 Months Ended				31 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016	Mar. 31, 2018
Restructuring Liability Rollforward [Line Items]
Stock-based compensation	$ 64,821	$ 82,044		$ 115,123
Restructuring Liability Rollforward [Roll Forward]
Restructuring reserve, beginning balance	4,121	16,395
Charges payable in cash	(136)	17,982	[1]
Cash payments	(2,777)	(30,943)
Foreign currency translation	(89)	687
Restructuring reserve, ending balance	1,119	4,121		16,395
Employee Severance and Benefit Costs
Restructuring Liability Rollforward [Line Items]
Restructuring Costs					$ 80,100
Restructuring Liability Rollforward [Roll Forward]
Restructuring reserve, beginning balance	3,817	14,135
Charges payable in cash	(353)	12,140	[1]
Cash payments	(2,256)	(23,117)
Foreign currency translation	(89)	659
Restructuring reserve, ending balance	1,119	3,817		14,135
Other Exit Costs
Restructuring Liability Rollforward [Roll Forward]
Restructuring reserve, beginning balance	304	2,260
Charges payable in cash	217	5,842	[1]
Cash payments	(521)	(7,826)
Foreign currency translation	0	28
Restructuring reserve, ending balance	0	304		2,260
Restructuring Charges
Restructuring Liability Rollforward [Line Items]
Stock-based compensation	$ 0	245		$ 851
Restructuring Charges | One-time Termination Benefits [Member]
Restructuring Liability Rollforward [Line Items]
Stock-based compensation		$ 800

[1] Excludes stock-based compensation of $0.8 million related to accelerated vesting of stock-based compensation awards for certain employees terminated as a result of our restructuring activities.

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INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Accumulated deficit	$ (1,010,499)	$ (1,088,204)
Income tax expense (benefit)	(957)	7,544	$ (5,318)
Income (loss) from continuing operations	1,031	36,145	(171,527)
Proposed income tax assessment penalties	1,600	$ 200	$ 1,200
Accounting Standards Update 2014-09 | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)	6,400
International
Operating Loss Carryforwards [Line Items]
Proposed income tax assessment penalties	110,000
Decrease in unrecognized benefits	$ 50,000

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INCOME TAXES Income Tax (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Income Taxes [Line Items]
Proposed income tax assessment penalties		$ 1,600	$ 200		$ 1,200
Income Tax Examination, Penalties and Interest Accrued		5,400	4,800		4,600
Increase (Decrease) in Income Taxes		7,900	3,000		8,400
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount		216	12,651		(60,035)
Current Income Tax Expense (Benefit)		4,043	6,941		5,130
Income tax expense (benefit)		(957)	7,544		(5,318)
Provision for income taxes		0	0		2,771
Deferred income taxes		(5,000)	603		(10,448)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	[1]	2,113	4,524		9,410
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount		1,966	(4,980)		(4,694)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		3,829	(36,057)		13,797
Reclassification for impact of U.S. tax rate change	[2]	1,544	20,466		7,135
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		607	3,332		853
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount		18	1,824		(4,899)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount		3,239	5,002		6,724
Tax Shortfalls on Stock-based Compensation		(335)	4,290		12,585
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount		0	0		4,484
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount		(8,331)	(7,862)		(8,547)
Effective Income Tax Rate Reconciliation, Forgiveness of Intercompany Liabilities		(1,340)	(2,494)		15,187
Effective Income Tax Rate Reconciliation, Deductions for Investments in Subsidiaries that have Ceased Operations		0	0		(645)
Effective Income Tax Rate Reconciliation, Expense, Ordinary Stock Loss		(11,815)	0		0
Effective Income Tax Rate Reconciliation, Non-taxable Gains on Business Dispositions		0	0		(3,481)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount		7,332	6,848		6,808
Income Tax Expense (Benefit), Continuing Operations, Discontinued Operations		(957)	7,544		(2,547)
Income (Loss) from Continuing Operations before Income Taxes, Domestic		23,349	30,095		(119,095)
Income (Loss) from Continuing Operations before Income Taxes, Foreign		(22,318)	6,050		(52,432)
Income (loss) from continuing operations before provision (benefit) for income taxes		1,031	36,145		(171,527)
Discontinued Operations, Disposed of by Sale
Income Taxes [Line Items]
Provision for income taxes	[3]		(81)	[4]	(2,771)
UNITED STATES
Income Taxes [Line Items]
Current Income Tax Expense (Benefit)		768	(120)		(1,093)
Deferred income taxes		(319)	(1,335)		(4,262)
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Current Income Tax Expense (Benefit)		57	191		912
Deferred income taxes		0	50		(11)
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Current Income Tax Expense (Benefit)		3,218	6,870		5,311
Deferred income taxes		$ (4,681)	$ 1,888		$ (6,175)

[1] Tax rates in foreign jurisdictions were generally lower than the U.S. federal statutory rate through December 31, 2018. This results in an adverse impact to the provision (benefit) for income taxes in this rate reconciliation for the years ended December 31, 2018, 2017 and 2016, prior to the impact of valuation allowances, due to the net pretax losses from continuing operations in certain foreign jurisdictions with lower tax rates.

[2] The effect of income tax rate changes on deferred items for the year ended December 31, 2017 is primarily related to the U.S. tax reform legislation that was signed into law on December 22, 2017, which included a reduction of the U.S. Federal income tax rate to 21 percent. That rate reduction did not impact the Company's provision for income taxes for the year ended December 31, 2017 due to the valuation allowance against the Company's U.S. net deferred tax assets.

[3] (1)The loss from discontinued operations before gain (loss) on dispositions and provision for income taxes for the years ended December 31, 2017 and 2016 includes the results of each business through its respective disposition date.

[4] (2)Selling, general and administrative expense from discontinued operations for the year ended December 31, 2017 includes increases to contingent liabilities under indemnification agreements. See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

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INCOME TAXES Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Increase (Decrease) in Income Taxes	$ 7,900	$ 3,000	$ 8,400
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	233,100
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals	25,694	36,786
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	5,167	3,720
Deferred Tax Assets, Operating Loss Carryforwards	206,328	208,040
Deferred Tax Assets, Goodwill and Intangible Assets	16,482	23,722
Deferred Tax Assets, Investments	5,916	814
Deferred Tax Assets, Unrealized Currency Losses	1,882	2,771
Deferred Tax Assets, Other	1,021	687
Deferred Tax Assets, Gross	262,490	276,540
Deferred Tax Assets, Valuation Allowance	(228,023)	(238,702)
Deferred Tax Assets, Net of Valuation Allowance	34,467	37,838
Deferred Tax Liabilities, Prepaid Expenses	12,737	10,011
Deferred Tax Liabilities, Property, Plant and Equipment	12,576	11,315
Deferred Tax Liabilities, Financing Arrangements	2,457	2,773
Deferred Tax Liabilities, Tax Deferred Income	7,255	10,436
Deferred Tax Liabilities, Gross, Noncurrent	35,025	34,535
Deferred Tax Liabilities, Net	558
Deferred Tax Assets, Net		$ 3,303
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	1,057,500
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	$ 462,200

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INCOME TAXES Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	$ 87,600	$ 87,400	$ 80,100	$ 79,600
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	33,300	37,600	34,500
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	1,500	960	1,708
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	21	1,196	3,154
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	7,533	9,571	11,443
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	0	(3,176)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	(9,447)	(3,777)	(4,906)
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation	$ (713)	$ (1,720)	$ (1,471)

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VARIABLE INTEREST ENTITY (Details)	12 Months Ended
	Dec. 31, 2018
Variable Interest Entity [Abstract]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	50.00%

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FAIR VALUE MEASUREMENTS - Fair Value, Assets and Liabilities, Reconciliation of Level 3 Inputs (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		$ 10,340	$ 26,785
Fair value option investments		73,902	82,966	$ 82,584	$ 130,725
(Gain) loss from changes in fair value of investments		(9,064)	382	(48,141)
Unrealized Gains (Losses) Still Held - Assets	[1]	(9,064)	382	(48,141)
Contingent consideration liability incurred in connection with acquisition of business		1,589	0	0
Business Combination, Contingent Consideration, Liability		0	(7,858)	0
Reclassification of contingent liability to non-fair value		0	(6,778)	(285)
Purchase of convertible note hedges		0	0	(59,163)
Proceeds from Convertible Debt		0	0	(250,000)
(Gain) loss, net from changes in fair value of contingent consideration		0	0	4,092
Business Combination, Contingent Consideration, Liability		1,529	0	14,588	10,781
Redeemable Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value option investments		10,340	15,431	17,444	22,834
Unrealized Gains (Losses) Still Held - Assets	[1]	(5,091)	(2,013)	(816)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		379	931	(816)
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities		5,470	2,944	0
Convertible Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value option investments		0	11,354	10,038	$ 10,116
Unrealized Gains (Losses) Still Held - Assets	[1]	0	1,303	1,607
Proceeds from Convertible Debt		(8,594)	(1,843)	(1,685)
available-for-sale investment transfer to other equity investment		(4,008)	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(1,148)	(437)	703
Unrealized Gain (Loss) on Securities	[2]	2,396	1,984	904
Convertible Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	11,354
Payments to Acquire Investments		0	(1,612)	$ 0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			137,975
Fair value option investments		73,902	82,966
Fair Value, Measurements, Recurring [Member] | Convertible Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities			11,354
Fair Value, Measurements, Recurring [Member] | Redeemable Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		10,340	15,431
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			137,975
Fair value option investments		0	0
Business Combination, Contingent Consideration, Liability		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Convertible Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities			0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Redeemable Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			0
Fair value option investments		0	0
Business Combination, Contingent Consideration, Liability		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Convertible Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities			0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Redeemable Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			0
Fair value option investments		73,902	82,966
Business Combination, Contingent Consideration, Liability		1,529
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Convertible Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities			11,354
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Redeemable Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		$ 10,340	$ 15,431

[1] (1)Represents the unrealized gains or losses recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.

[2] (2)Represents a gain at maturity of a previously impaired convertible debt security, accretion of interest income and changes in the fair value of an embedded derivative.

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INCOME (LOSS) PER SHARE - Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		2 Months Ended	3 Months Ended																10 Months Ended	12 Months Ended
		Dec. 31, 2016	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Oct. 31, 2016	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Earnings Per Share, Diluted			$ 0.08	[1]	$ 0.08	[1],[2]	$ (0.17)	[1],[2]	$ (0.01)	[1]	$ 0.08	[1]	$ 0.00	[1]	$ (0.02)	[1]	$ (0.04)	[1]		$ (0.02)	$ 0.02
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share			$ 0.00	[1]	$ 0.00	[1],[2]	$ 0.00	[1],[2]	$ 0.00	[1]	$ 0.00	[1]	$ 0.00	[1]	$ (0.01)	[1]	$ 0.00	[1]		$ 0.00	$ (0.01)
Numerator
Income (loss) from continuing operations			$ 49,862		$ 47,175		$ (92,254)		$ (2,795)		$ 51,071		$ 3,802		$ (5,403)		$ (20,869)			$ 1,988	$ 28,601		$ (166,209)
Less: Net income (loss) attributable to noncontrolling interests																				13,067	12,587		11,264
Income (loss) from discontinued operations, net of tax			0	[3]	0	[2],[3]	0	[2],[3]	0	[3]	(223)	[3]	(862)	[3]	(1,376)	[3]	487	[3]		0	(1,974)	[4],[5]	(17,114)	[4]
Net income (loss) attributable to common stockholders			$ 46,228		$ 44,615	[2]	$ (95,034)	[2]	$ (6,888)		$ 47,721		$ 59		$ (9,326)		$ (24,414)			$ (11,079)	$ 14,040		$ (194,587)
Denominator
Weighted-average common shares outstanding (in shares)																				566,511,108	559,367,075
Weighted Average Number of Shares Outstanding, Diluted																				566,511,108	568,418,371		576,354,258	[6]
Basic net income (loss) per share (in usd per share)			$ 0.08	[1]	$ 0.08	[1],[2]	$ (0.17)	[1],[2]	$ (0.01)	[1]	$ 0.09	[1]	$ 0.00	[1]	$ (0.02)	[1]	$ (0.04)	[1]		$ (0.02)	$ 0.03		$ (0.34)	[6],[7]
Income (Loss) from Continuing Operations, Per Basic Share			0.08	[1]	0.08	[1],[2]	(0.17)	[1],[2]	(0.01)	[1]	0.09	[1]	0.00	[1]	(0.01)	[1]	(0.04)	[1]		(0.02)	0.03		(0.31)	[6],[7]
Discontinued operations (in usd per share)			0.00	[1]	0.00	[1],[2]	0.00	[1],[2]	0.00	[1]	0.00	[1]	0.00	[1]	(0.01)	[1]	0.00	[1]		0.00	0.00		$ (0.03)	[6],[7]
Income (Loss) from Continuing Operations, Per Diluted Share			$ 0.08	[1]	$ 0.08	[1],[2]	$ (0.17)	[1],[2]	$ (0.01)	[1]	$ 0.08	[1]	$ 0.00	[1]	$ (0.01)	[1]	$ (0.04)	[1]		$ (0.02)	$ 0.03
Common Class A [Member]
Numerator
Income (loss) from continuing operations																			$ (151,284)	$ 1,988	$ 28,601
Less: Net income (loss) attributable to noncontrolling interests																			9,559	13,067	12,587
Net income (loss) attributable to common stockholders - continuing operations																			(160,843)	(11,079)	16,014
Income (loss) from discontinued operations, net of tax																			(7,152)	0	(1,974)
Net income (loss) attributable to common stockholders																			$ (167,995)	$ (11,079)	$ 14,040
Denominator
Weighted-average common shares outstanding (in shares)																			574,755,214
Basic and diluted net income (loss) per share (1):
Continuing operations (in usd per share)	[7]																		$ (0.28)
Basic and diluted net income (loss) per share (in usd per share)	[7]																		$ (0.29)
Employee Stock Option
Denominator
Weighted Average Number Diluted Shares Outstanding Adjustment																				0	842,047
Restricted Stock [Member]
Denominator
Weighted Average Number Diluted Shares Outstanding Adjustment																				0	488,773
Restricted Stock Units (RSUs)
Denominator
Weighted Average Number Diluted Shares Outstanding Adjustment																				0	7,153,674
Employee Stock [Member]
Denominator
Weighted Average Number Diluted Shares Outstanding Adjustment																				0	201,504
Performance Shares
Denominator
Weighted Average Number Diluted Shares Outstanding Adjustment																				0	365,298
Common Stock
Numerator
Income (loss) from continuing operations		$ (14,293)																					$ (166,209)	[6]
Less: Net income (loss) attributable to noncontrolling interests		1,665																					11,264	[6]
Net income (loss) attributable to common stockholders - continuing operations		(15,958)																					(177,473)	[6]
Income (loss) from discontinued operations, net of tax		(9,932)																					(17,114)	[6]
Net income (loss) attributable to common stockholders		$ (25,890)																					(194,587)	[6]
Denominator
Weighted-average common shares outstanding (in shares)		574,884,987
Basic and diluted net income (loss) per share (1):
Continuing operations (in usd per share)	[7]	$ (0.03)
Basic and diluted net income (loss) per share (in usd per share)	[7]	$ (0.05)
Continuing Operations
Numerator
Income (loss) from continuing operations																				$ 1,988	$ 28,601		$ (166,209)

[1] The sum of per share amounts for quarterly periods may not equal year-to-date amounts due to rounding.

[2] Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

[3] Income (loss) from continuing operations includes restructuring charges of $11.5 million, $4.6 million and $2.7 million for the three months ended September 30, 2017, June 30, 2017 and March 31, 2017. Restructuring charges were not material for any quarterly period during the year ended December 31, 2018 or for the three months ended December 31, 2017.

[4] (1)The loss from discontinued operations before gain (loss) on dispositions and provision for income taxes for the years ended December 31, 2017 and 2016 includes the results of each business through its respective disposition date.

[5] (2)Selling, general and administrative expense from discontinued operations for the year ended December 31, 2017 includes increases to contingent liabilities under indemnification agreements. See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

[6] The potentially dilutive impacts of a conversion of Class B to Class A shares, outstanding equity awards, warrants and convertible senior notes have been excluded from the calculation of dilutive net income (loss) per share for the years ended December 31, 2016 as their effect on net income (loss) per share from continuing operations was antidilutive.

[7] The shares of Class A and Class B common stock had equal dividend rights and converted into shares of common stock on a one-for-one basis on October 31, 2016. This full year column reflects the weighted average Class A and Class B common shares outstanding for the period from January 1, 2016 through the October 31, 2016 conversion date and the weighted average common shares outstanding for the period from November 1, 2016 through December 31, 2016 in the denominator of the basic and diluted loss per share calculations for the year ended December 31, 2016.

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FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($)			3 Months Ended			8 Months Ended	12 Months Ended
		Apr. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value						$ 73,902,000	$ 73,902,000	$ 82,966,000	$ 82,584,000	$ 130,725,000
(Gain) loss from changes in fair value of investments							(9,064,000)	382,000	(48,141,000)
Unrealized Gains (Losses) Still Held - Assets	[1]						(9,064,000)	382,000	(48,141,000)
Proceeds from Convertible Debt							0	0	(250,000,000)
Payment for Contingent Consideration Liability, Operating Activities							0	(7,858,000)	0
Reclassification of contingent liability to non-fair value							0	(6,778,000)	(285,000)
(Gain) loss, net from changes in fair value of contingent consideration							56,000	48,000	4,092,000
Foreign Currency Contracts, Liability, Fair Value Disclosure							116,000	0	0
Business Combination, Contingent Consideration, Liability						1,529,000	1,529,000	0	14,588,000	$ 10,781,000
Contingent consideration liability incurred in connection with acquisition of business							1,589,000	0	0
Unrealized (Losses) Gains Still Held - Liabilities	[1]						56,000	0	3,966,000
Restructuring charges			$ 11,500,000	$ 4,600,000	$ 2,700,000		(136,000)	18,828,000	40,438,000
Investments, Fair Value Disclosure						84,242,000	84,242,000	109,751,000
Monster LP
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
(Gain) loss from changes in fair value of investments							$ (9,509,000)	$ 249,000	(35,350,000)
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate							21.00%	22.00%
Convertible Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments to Acquire Investments							$ 0	$ 1,612,000	0
Cloud Savings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent Consideration Classified as Equity, Fair Value Disclosure						2,500,000	2,500,000
Contingent consideration liability incurred in connection with acquisition of business		$ 1,600,000				$ 1,589,000
Asset Impairments Related to Restructuring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring charges							0	$ 0	328,000
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure									$ 0
Other Equity Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities							$ (4,600,000)

[1] (1)Represents the unrealized gains or losses recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.

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INCOME (LOSS) PER SHARE - Schedule of Weighted-Average Potentially Dilutive Instruments (Details) - USD ($) $ / shares in Units, $ in Thousands		2 Months Ended	3 Months Ended																10 Months Ended	12 Months Ended
		Dec. 31, 2016	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Oct. 31, 2016	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (loss) from continuing operations			$ 49,862		$ 47,175		$ (92,254)		$ (2,795)		$ 51,071		$ 3,802		$ (5,403)		$ (20,869)			$ 1,988	$ 28,601		$ (166,209)
Net income attributable to noncontrolling interests																				13,067	12,587		11,264
Income (loss) from discontinued operations, net of tax			0	[1]	0	[1],[2]	0	[1],[2]	0	[1]	(223)	[1]	(862)	[1]	(1,376)	[1]	487	[1]		0	(1,974)	[3],[4]	(17,114)	[3]
Net income (loss) attributable to parent			$ 46,228		$ 44,615	[2]	$ (95,034)	[2]	$ (6,888)		$ 47,721		$ 59		$ (9,326)		$ (24,414)			$ (11,079)	$ 14,040		$ (194,587)
Weighted-average common shares outstanding (in shares)																				566,511,108	559,367,075
Weighted Average Number of Shares Outstanding, Diluted																				566,511,108	568,418,371		576,354,258	[5]
Continuing operations (in usd per share)			$ 0.08	[6]	$ 0.08	[2],[6]	$ (0.17)	[2],[6]	$ (0.01)	[6]	$ 0.09	[6]	$ 0.00	[6]	$ (0.01)	[6]	$ (0.04)	[6]		$ (0.02)	$ 0.03		$ (0.31)	[5],[7]
Income (Loss) from Continuing Operations, Per Diluted Share			0.08	[6]	0.08	[2],[6]	(0.17)	[2],[6]	(0.01)	[6]	0.08	[6]	0.00	[6]	(0.01)	[6]	(0.04)	[6]		(0.02)	0.03
Discontinued operations (in usd per share)			0.00	[6]	0.00	[2],[6]	0.00	[2],[6]	0.00	[6]	0.00	[6]	0.00	[6]	(0.01)	[6]	0.00	[6]		0.00	0.00		$ (0.03)	[5],[7]
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share			0.00	[6]	0.00	[2],[6]	0.00	[2],[6]	0.00	[6]	0.00	[6]	0.00	[6]	(0.01)	[6]	0.00	[6]		$ 0.00	$ (0.01)
Antidilutive securities excluded from computation of earnings per share (in shares)																				125,185,727	100,693,145		101,306,228
Earnings Per Share, Diluted			0.08	[6]	0.08	[2],[6]	(0.17)	[2],[6]	(0.01)	[6]	0.08	[6]	0.00	[6]	(0.02)	[6]	(0.04)	[6]		$ (0.02)	$ 0.02
Basic net income (loss) per share (in usd per share)			$ 0.08	[6]	$ 0.08	[2],[6]	$ (0.17)	[2],[6]	$ (0.01)	[6]	$ 0.09	[6]	$ 0.00	[6]	$ (0.02)	[6]	$ (0.04)	[6]		$ (0.02)	$ 0.03		$ (0.34)	[5],[7]
Common Class A [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (loss) from continuing operations																			$ (151,284)	$ 1,988	$ 28,601
Net income attributable to noncontrolling interests																			9,559	13,067	12,587
Net income (loss) attributable to common stockholders - continuing operations																			(160,843)	(11,079)	16,014
Income (loss) from discontinued operations, net of tax																			(7,152)	0	(1,974)
Net income (loss) attributable to parent																			$ (167,995)	$ (11,079)	$ 14,040
Weighted-average common shares outstanding (in shares)																			574,755,214
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	[7]																		$ (0.28)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic and Diluted Share	[7]																		(0.01)
Basic and diluted net income (loss) per share (in usd per share)	[7]																		$ (0.29)
Common Class B [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (loss) from continuing operations																			$ (632)
Net income attributable to noncontrolling interests																			40
Net income (loss) attributable to common stockholders - continuing operations																			(672)
Income (loss) from discontinued operations, net of tax																			(30)
Net income (loss) attributable to parent																			$ (702)
Weighted-average common shares outstanding (in shares)																			2,399,976
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	[7]																		$ (0.28)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic and Diluted Share	[7]																		(0.01)
Basic and diluted net income (loss) per share (in usd per share)	[7]																		$ (0.29)
Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (loss) from continuing operations		$ (14,293)																					$ (166,209)	[5]
Net income attributable to noncontrolling interests		1,665																					11,264	[5]
Net income (loss) attributable to common stockholders - continuing operations		(15,958)																					(177,473)	[5]
Income (loss) from discontinued operations, net of tax		(9,932)																					(17,114)	[5]
Net income (loss) attributable to parent		$ (25,890)																					$ (194,587)	[5]
Weighted-average common shares outstanding (in shares)		574,884,987
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	[7]	$ (0.03)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic and Diluted Share	[7]	(0.02)
Basic and diluted net income (loss) per share (in usd per share)	[7]	$ (0.05)
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)																				30,552,028	8,087,545		33,480,458
Other stock-based compensation awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)																				2,041,099	13,000		3,850,389
Convertible Debt [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)																				46,296,300	46,296,300		34,213,474
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)																				46,296,300	46,296,300		29,761,907

[1] Income (loss) from continuing operations includes restructuring charges of $11.5 million, $4.6 million and $2.7 million for the three months ended September 30, 2017, June 30, 2017 and March 31, 2017. Restructuring charges were not material for any quarterly period during the year ended December 31, 2018 or for the three months ended December 31, 2017.

[2] Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

[3] (1)The loss from discontinued operations before gain (loss) on dispositions and provision for income taxes for the years ended December 31, 2017 and 2016 includes the results of each business through its respective disposition date.

[4] (2)Selling, general and administrative expense from discontinued operations for the year ended December 31, 2017 includes increases to contingent liabilities under indemnification agreements. See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

[5] The potentially dilutive impacts of a conversion of Class B to Class A shares, outstanding equity awards, warrants and convertible senior notes have been excluded from the calculation of dilutive net income (loss) per share for the years ended December 31, 2016 as their effect on net income (loss) per share from continuing operations was antidilutive.

[6] The sum of per share amounts for quarterly periods may not equal year-to-date amounts due to rounding.

[7] The shares of Class A and Class B common stock had equal dividend rights and converted into shares of common stock on a one-for-one basis on October 31, 2016. This full year column reflects the weighted average Class A and Class B common shares outstanding for the period from January 1, 2016 through the October 31, 2016 conversion date and the weighted average common shares outstanding for the period from November 1, 2016 through December 31, 2016 in the denominator of the basic and diluted loss per share calculations for the year ended December 31, 2016.

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FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Method Investments	[1]					$ 25,438
Fair value option investments					$ 73,902	82,966	$ 82,584	$ 130,725
Available-for-sale Securities					10,340	26,785
Cost Method Investments, Fair Value Disclosure	[1]					32,792
Restructuring charges		$ 11,500	$ 4,600	$ 2,700	(136)	18,828	40,438
Unrealized (Losses) Gains Still Held - Liabilities	[2]				56	0	3,966
Business Combination, Contingent Consideration, Liability					1,529	0	14,588	10,781
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets:						137,975
Fair value option investments					73,902	82,966
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets:						137,975
Fair value option investments					0	0
Business Combination, Contingent Consideration, Liability					0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets:						0
Fair value option investments					0	0
Business Combination, Contingent Consideration, Liability					0
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets:						0
Fair value option investments					73,902	82,966
Business Combination, Contingent Consideration, Liability					1,529
Redeemable Preferred Stock | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities					10,340	15,431
Redeemable Preferred Stock | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities					0	0
Redeemable Preferred Stock | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities					0	0
Redeemable Preferred Stock | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities					10,340	15,431
Asset Impairments Related to Restructuring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring charges					0	0	328
Convertible Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value option investments					0	11,354	10,038	10,116
Redeemable Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities					5,470	2,944	0
Transfer to Cost Method Investment Classification					0	0	(4,574)
Fair value option investments					$ 10,340	$ 15,431	$ 17,444	$ 22,834

[1] (1)See Note 2, Summary of Significant Accounting Policies, and Note 7, Investments, for information about our adoption of ASU 2016-01 on January 1, 2018 and its impact on accounting for equity investments without readily determinable fair values that were previously subject to the cost method of accounting.

[2] (1)Represents the unrealized gains or losses recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.

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FAIR VALUE MEASUREMENTS - Fair Value of Financial Assets and Liabilities Not Measured at Fair Value (Details) $ in Thousands	Dec. 31, 2017 USD ($)	[1]
Fair Value Disclosures [Abstract]
Carrying Amount	$ 25,438
Fair Value	$ 32,792

[1] (1)See Note 2, Summary of Significant Accounting Policies, and Note 7, Investments, for information about our adoption of ASU 2016-01 on January 1, 2018 and its impact on accounting for equity investments without readily determinable fair values that were previously subject to the cost method of accounting.

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SEGMENT INFORMATION - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017 segment	Dec. 31, 2016 segment
Segment Reporting [Abstract]
Number of Reportable Segments	2	2	3

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SEGMENT INFORMATION - Schedule of Revenue by Segment (Details) - USD ($) $ in Thousands		3 Months Ended										12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Revenue by Segment [Line Items]
Stock-based compensation												$ 64,821	$ 82,044	$ 115,123
Total revenue												2,636,746	2,843,877	3,013,615
Revenues		$ 799,927	$ 592,883		$ 617,396		$ 626,540	$ 873,166	$ 634,466	$ 662,619	$ 673,626
North America
Schedule of Revenue by Segment [Line Items]
Stock-based compensation												59,700	76,100	104,700
Total revenue	[2]											1,639,395	1,914,168	2,151,769
International
Schedule of Revenue by Segment [Line Items]
Stock-based compensation												5,000	5,700	9,500
Total revenue	[2]											997,351	929,709	861,846
Local
Schedule of Revenue by Segment [Line Items]
Total revenue												1,059,563
Local | North America
Schedule of Revenue by Segment [Line Items]
Total revenue												752,863
Local | International
Schedule of Revenue by Segment [Line Items]
Total revenue												306,700
Goods
Schedule of Revenue by Segment [Line Items]
Total revenue												32,885
Goods | North America
Schedule of Revenue by Segment [Line Items]
Total revenue												18,283
Goods | International
Schedule of Revenue by Segment [Line Items]
Total revenue												14,602
Travel
Schedule of Revenue by Segment [Line Items]
Total revenue												113,039
Travel | North America
Schedule of Revenue by Segment [Line Items]
Total revenue												71,856
Travel | International
Schedule of Revenue by Segment [Line Items]
Total revenue												41,183
UNITED STATES
Schedule of Revenue by Segment [Line Items]
Revenues												1,600,200	1,884,700	2,120,300
UNITED KINGDOM
Schedule of Revenue by Segment [Line Items]
Revenues												390,400	343,900	321,900
Product
Schedule of Revenue by Segment [Line Items]
Total revenue												1,431,259	1,577,425	1,807,174
Product | Goods
Schedule of Revenue by Segment [Line Items]
Total revenue												1,431,259
Product | Goods | North America
Schedule of Revenue by Segment [Line Items]
Total revenue												796,393	993,326	1,297,810
Product | Goods | International
Schedule of Revenue by Segment [Line Items]
Total revenue												634,866	584,099	509,364
Service
Schedule of Revenue by Segment [Line Items]
Total revenue												1,205,487	1,266,452	1,206,441
Service | Local | North America
Schedule of Revenue by Segment [Line Items]
Total revenue												752,863	825,579	762,314
Service | Local | International
Schedule of Revenue by Segment [Line Items]
Total revenue												306,700	281,466	270,045
Service | Goods | North America
Schedule of Revenue by Segment [Line Items]
Total revenue												18,283	16,768	9,068
Service | Goods | International
Schedule of Revenue by Segment [Line Items]
Total revenue												14,602	20,358	32,681
Service | Travel | North America
Schedule of Revenue by Segment [Line Items]
Total revenue												71,856	78,495	82,577
Service | Travel | International
Schedule of Revenue by Segment [Line Items]
Total revenue												$ 41,183	$ 43,786	$ 49,756

[1] Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

[2] North America includes revenue from the United States of $1,600.2 million, $1,884.7 million and $2,120.3 million for the years ended December 31, 2018, 2017 and 2016. International includes revenue from the United Kingdom of $390.4 million, $343.9 million and $321.9 million for the years ended December 31, 2018, 2017 and 2016. There were no other individual countries that represented more than 10% of consolidated total revenue for the years ended December 31, 2018, 2017 and 2016. Revenue is attributed to individual countries based on the location of the customer. In prior periods, revenue was attributed to individual countries based on the domicile of the legal entities within our consolidated group that undertook those transactions. Beginning in the second quarter of 2017, we updated our attribution of revenue by country to be based on the location of the customer. Prior period revenue amounts by country have been retrospectively adjusted to reflect that change in attribution.

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SEGMENT INFORMATION - Schedule of Gross Profit by Segment (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Gross Profit	$ 366,069	$ 305,989		$ 323,658		$ 324,885	$ 386,918	$ 309,425	$ 328,067	$ 309,451	$ 1,320,601	$ 1,333,861	$ 1,280,653
North America
Segment Reporting Information [Line Items]
Gross Profit											890,684	927,678	885,547
International
Segment Reporting Information [Line Items]
Gross Profit											429,917	406,183	395,106
Service | Local | North America
Segment Reporting Information [Line Items]
Gross Profit											671,352	708,573	660,983
Service | Local | International
Segment Reporting Information [Line Items]
Gross Profit											289,427	265,348	250,435
Service | Goods | North America
Segment Reporting Information [Line Items]
Gross Profit											15,302	12,929	7,470
Service | Goods | International
Segment Reporting Information [Line Items]
Gross Profit											13,252	17,910	27,976
Service | Travel | North America
Segment Reporting Information [Line Items]
Gross Profit											57,945	60,594	64,355
Service | Travel | International
Segment Reporting Information [Line Items]
Gross Profit											38,132	40,288	45,191
Product | Goods | North America
Segment Reporting Information [Line Items]
Gross Profit											146,085	145,582	152,739
Product | Goods | International
Segment Reporting Information [Line Items]
Gross Profit											$ 89,106	$ 82,637	$ 71,504

[1] Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

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SEGMENT INFORMATION - Schedule of Operating Income by Segment (Details) - USD ($) $ in Thousands		3 Months Ended										12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Schedule of Operating Income (Loss) by Segment
Income (loss) from operations		$ 61,876	$ 53,023		$ (64,245)		$ 3,385	$ 49,726	$ (1,213)	$ (7,398)	$ (11,680)	$ 54,039	[2],[3],[4],[5]	$ 29,435	[2],[3],[4],[5]	$ (100,238)	[2],[3],[4],[5]
Stock-based compensation												64,821		82,044		115,123
North America
Schedule of Operating Income (Loss) by Segment
Income (loss) from operations	[2],[3],[4],[5]											19,909		(45)		(85,423)
Stock-based compensation												59,700		76,100		104,700
Acquisition related (benefit) expense, net																5,700
Provision for loss contingency												34,600
International
Schedule of Operating Income (Loss) by Segment
Income (loss) from operations	[2],[3],[4],[5]											34,130		29,480		(14,815)
Stock-based compensation												5,000		$ 5,700		$ 9,500
Acquisition related (benefit) expense, net												$ 700

[1] Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

[2] Includes a $34.6 million charge related to the IBM patent litigation matter for North America for the year ended December 31, 2018. See Note 10, Commitments and Contingencies, for additional information.

[3] Includes acquisition-related (benefit) expense, net of $0.7 million for International for the year ended December 31, 2018 and $5.7 million for North America for the year ended December 31, 2016.

[4] Includes restructuring charges for North America and International. See Note 14, Restructuring, for restructuring charges by segment.

[5] Includes stock-based compensation of $59.7 million, $76.1 million and $104.7 million for North America and $5.0 million, $5.7 million and $9.5 million for International for the years ended December 31, 2018, 2017 and 2016, respectively.

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SEGMENT INFORMATION - Schedule of Total Assets, Tangible Property and Equipment, Depreciation and Amortization and Property Additions by Segment (Details) - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		$ 1,642,142,000	$ 1,677,505,000
Property, Plant and Equipment, Net		143,117,000	151,145,000
Depreciation, Depletion and Amortization, Nonproduction		115,828,000	137,827,000	$ 135,909,000
Property, Plant and Equipment, Additions		16,587,000	11,023,000	15,025,000
North America
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	[1]	958,412,000	1,045,072,000
Depreciation, Depletion and Amortization, Nonproduction		101,419,000	121,616,000	116,865,000
Property, Plant and Equipment, Additions		6,194,000	5,917,000	9,770,000
International
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	[1]	683,730,000	632,433,000
Depreciation, Depletion and Amortization, Nonproduction		14,409,000	16,211,000	19,044,000
Property, Plant and Equipment, Additions		10,393,000	5,106,000	$ 5,255,000
UNITED STATES
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		940,500,000	1,006,200,000
IRELAND
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		204,600,000	219,700,000
Property, Plant and Equipment, Net			0.12
Other Machinery and Equipment
Segment Reporting, Asset Reconciling Item [Line Items]
Property, Plant and Equipment, Net		71,805,000	85,252,000
Other Machinery and Equipment | North America
Segment Reporting, Asset Reconciling Item [Line Items]
Property, Plant and Equipment, Net	[2]	51,032,000	63,402,000
Other Machinery and Equipment | International
Segment Reporting, Asset Reconciling Item [Line Items]
Property, Plant and Equipment, Net	[3]	$ 20,773,000	$ 21,850,000

[1] North America contains assets from the United States of $940.5 million and $1,006.2 million as of December 31, 2018 and 2017. International contains assets from Ireland of $204.6 million and $219.7 million as of December 31, 2018 and 2017. There were no other individual countries that represented more than 10% of consolidated total assets as of December 31, 2018 and 2017.

[2] Substantially all tangible property and equipment within North America is located in the United States.

[3] Tangible property and equipment, net located within Ireland represented approximately 12% of our consolidated tangible property and equipment, net as of December 31, 2017. There were no other individual countries located outside of the United States that represented more than 10% of consolidated tangible property and equipment, net as of December 31, 2018 and 2017.

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RELATED PARTY TRANSACTION (Details) - Uptake [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Capital Leases, Future Minimum Sublease Rentals	$ 18.2
Sublease Income	$ 2.1	$ 1.9

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QUARTERLY RESULTS (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 799,927		$ 592,883	[1]	$ 617,396	[1]	$ 626,540		$ 873,166		$ 634,466		$ 662,619		$ 673,626
Cost of Revenue	433,858		286,894	[1]	293,738	[1]	301,655		486,248		325,041		334,552		364,175
Gross Profit	366,069		305,989	[1]	323,658	[1]	324,885		386,918		309,425		328,067		309,451		$ 1,320,601		$ 1,333,861		$ 1,280,653
Income (loss) from operations	61,876		53,023	[1]	(64,245)	[1]	3,385		49,726		(1,213)		(7,398)		(11,680)		54,039	[2],[3],[4],[5]	29,435	[2],[3],[4],[5]	(100,238)	[2],[3],[4],[5]
Income (loss) from continuing operations	49,862		47,175		(92,254)		(2,795)		51,071		3,802		(5,403)		(20,869)		1,988		28,601		(166,209)
Income (loss) from discontinued operations, net of tax	0	[6]	0	[1],[6]	0	[1],[6]	0	[6]	(223)	[6]	(862)	[6]	(1,376)	[6]	487	[6]	0		(1,974)	[7],[8]	(17,114)	[7]
Net income (loss) attributable to parent	$ 46,228		$ 44,615	[1]	$ (95,034)	[1]	$ (6,888)		$ 47,721		$ 59		$ (9,326)		$ (24,414)		$ (11,079)		$ 14,040		$ (194,587)
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.08	[9]	$ 0.08	[1],[9]	$ (0.17)	[1],[9]	$ (0.01)	[9]	$ 0.09	[9]	$ 0.00	[9]	$ (0.01)	[9]	$ (0.04)	[9]	$ (0.02)		$ 0.03		$ (0.31)	[10],[11]
Discontinued operations (in usd per share)	0.00	[9]	0.00	[1],[9]	0.00	[1],[9]	0.00	[9]	0.00	[9]	0.00	[9]	(0.01)	[9]	0.00	[9]	0.00		0.00		(0.03)	[10],[11]
Basic net income (loss) per share (in usd per share)	0.08	[9]	0.08	[1],[9]	(0.17)	[1],[9]	(0.01)	[9]	0.09	[9]	0.00	[9]	(0.02)	[9]	(0.04)	[9]	(0.02)		0.03		$ (0.34)	[10],[11]
Income (Loss) from Continuing Operations, Per Diluted Share	0.08	[9]	0.08	[1],[9]	(0.17)	[1],[9]	(0.01)	[9]	0.08	[9]	0.00	[9]	(0.01)	[9]	(0.04)	[9]	(0.02)		0.03
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0.00	[9]	0.00	[1],[9]	0.00	[1],[9]	0.00	[9]	0.00	[9]	0.00	[9]	(0.01)	[9]	0.00	[9]	0.00		(0.01)
Earnings Per Share, Diluted	$ 0.08	[9]	$ 0.08	[1],[9]	$ (0.17)	[1],[9]	$ (0.01)	[9]	$ 0.08	[9]	$ 0.00	[9]	$ (0.02)	[9]	$ (0.04)	[9]	$ (0.02)		$ 0.02

[1] Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

[2] Includes a $34.6 million charge related to the IBM patent litigation matter for North America for the year ended December 31, 2018. See Note 10, Commitments and Contingencies, for additional information.

[3] Includes acquisition-related (benefit) expense, net of $0.7 million for International for the year ended December 31, 2018 and $5.7 million for North America for the year ended December 31, 2016.

[4] Includes restructuring charges for North America and International. See Note 14, Restructuring, for restructuring charges by segment.

[5] Includes stock-based compensation of $59.7 million, $76.1 million and $104.7 million for North America and $5.0 million, $5.7 million and $9.5 million for International for the years ended December 31, 2018, 2017 and 2016, respectively.

[6] Income (loss) from continuing operations includes restructuring charges of $11.5 million, $4.6 million and $2.7 million for the three months ended September 30, 2017, June 30, 2017 and March 31, 2017. Restructuring charges were not material for any quarterly period during the year ended December 31, 2018 or for the three months ended December 31, 2017.

[7] (1)The loss from discontinued operations before gain (loss) on dispositions and provision for income taxes for the years ended December 31, 2017 and 2016 includes the results of each business through its respective disposition date.

[8] (2)Selling, general and administrative expense from discontinued operations for the year ended December 31, 2017 includes increases to contingent liabilities under indemnification agreements. See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

[9] The sum of per share amounts for quarterly periods may not equal year-to-date amounts due to rounding.

[10] The potentially dilutive impacts of a conversion of Class B to Class A shares, outstanding equity awards, warrants and convertible senior notes have been excluded from the calculation of dilutive net income (loss) per share for the years ended December 31, 2016 as their effect on net income (loss) per share from continuing operations was antidilutive.

[11] The shares of Class A and Class B common stock had equal dividend rights and converted into shares of common stock on a one-for-one basis on October 31, 2016. This full year column reflects the weighted average Class A and Class B common shares outstanding for the period from January 1, 2016 through the October 31, 2016 conversion date and the weighted average common shares outstanding for the period from November 1, 2016 through December 31, 2016 in the denominator of the basic and diluted loss per share calculations for the year ended December 31, 2016.

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QUARTERLY RESULTS (UNAUDITED) - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 11,500	$ 4,600	$ 2,700	$ (136)	$ 18,828	$ 40,438
IBM Patent Litigation Case
Restructuring Cost and Reserve [Line Items]
Gain (Loss) Related to Litigation Settlement	$ 40,400	$ 75,000				$ 34,600

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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - Tax Valuation Allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 238,702	$ 220,611	$ 205,152
Charged to Expense(1)	3,829	10,476	13,797
Acquisitions and Other	(14,508)	7,615	1,662
Balance at End of Year	$ 228,023	$ 238,702	$ 220,611