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Summary of Significant Accounting Policies
9 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]  
Inventory
Inventories consist of the following (in thousands):
 
September 30,
 
December 31,
 
2018
 
2017
Aftermarket and refurbished products
$
2,287,776

 
$
1,877,653

Salvage and remanufactured products
484,761

 
487,108

Manufactured products
22,357

 
16,022

Total inventories
$
2,794,894

 
$
2,380,783


    Aftermarket and refurbished products and salvage and remanufactured products are primarily composed of finished goods. As of September 30, 2018, manufactured products inventory was composed of $16 million of raw materials, $2 million of work in process, and $4 million of finished goods. As of December 31, 2017, manufactured products inventory was composed of $10 million of raw materials, $2 million of work in process, and $4 million of finished goods.
Our May 2018 acquisition of Stahlgruber contributed $374 million to our aftermarket and refurbished products inventory. See Note 2, "Business Combinations" for further information on our acquisitions.
Receivables, Policy [Policy Text Block]
We have a reserve for uncollectible accounts, which was approximately $63 million and $58 million at September 30, 2018 and December 31, 2017, respectively. Our May 2018 acquisition of Stahlgruber contributed $3 million to our reserve for uncollectible accounts. See Note 2, "Business Combinations" for further information on our acquisitions.
Recent Accounting Pronouncements
Recent Accounting Pronouncements
Adoption of New Revenue Standard
In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2014-09, "Revenue from Contracts with Customers" ("ASU 2014-09"). This update outlines a new comprehensive revenue recognition model that supersedes the prior revenue recognition guidance and requires companies to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The FASB has issued several updates to ASU 2014-09, which collectively with ASU 2014-09, represent the FASB Accounting Standards Codification Topic 606 (“ASC 606”). On January 1, 2018, we adopted ASC 606 for all contracts using the modified retrospective method, which means the historical periods are presented under the previous revenue standards with the cumulative net income effect being adjusted through retained earnings.
Most of the changes resulting from our adoption of ASC 606 were changes in presentation within the Unaudited Condensed Consolidated Balance Sheets and the Unaudited Condensed Consolidated Statements of Income. Therefore, while we made adjustments to certain opening balances on our January 1, 2018 balance sheet, we made no adjustments to opening retained earnings. We expect the impact of the adoption of ASC 606 to be immaterial to our net income on an ongoing basis. See Note 5, "Revenue Recognition" for the required disclosures under ASC 606.
With the adoption of ASC 606, we reclassified certain amounts related to variable consideration. Under ASC 606, we are required to present a refund liability and a returns asset within the Unaudited Condensed Consolidated Balance Sheet, whereas in periods prior to adoption, we presented the estimated margin impact of expected returns as a contra-asset within accounts receivable. Additionally, under ASC 606, the changes in the refund liability are reported in revenue, and the changes in the returns assets are reported in Cost of goods sold on the Unaudited Condensed Consolidated Statements of Income. Prior to adoption, the change in the reserve for returns was generally reported as a net amount within revenue. As a result, the income statement presentation was adjusted concurrently with the balance sheet change beginning in 2018.
The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASC 606 was as follows (in thousands):
 
Balance as of December 31, 2017
 
Adjustments Due to ASC 606
 
Balance as of January 1, 2018
Balance Sheet
 
 
 
 
 
Assets
 
 
 
 
 
Accounts receivable
$
1,027,106

 
$
38,511

 
$
1,065,617

Prepaid expenses and other current assets
134,479

 
44,508

 
178,987

Liabilities
 
 
 
 
 
Refund liability

 
83,019

 
83,019


The impact of the adoption of ASC 606 on our Unaudited Condensed Consolidated Balance Sheet as of September 30, 2018 and our Unaudited Condensed Consolidated Statements of Income for the three and nine months ended September 30, 2018 was as follows (in thousands):
 
Balance as of September 30, 2018
 
As Reported
 
Amounts Without Adoption of ASC 606
 
Effect of Change Higher/(Lower)
Balance Sheet
 
 
 
 
 
Assets
 
 
 
 
 
Accounts receivable
$
1,255,876

 
$
1,205,833

 
$
50,043

Prepaid expenses and other current assets
200,944

 
144,255

 
56,689

Liabilities
 
 
 
 
 
Refund liability
106,732

 

 
106,732

 
For the three months ended September 30, 2018
 
As Reported
 
Amounts Without Adoption of ASC 606
 
Effect of Change Higher/(Lower)
Income Statement
 
 
 
 
 
Revenue
$
3,122,378

 
$
3,123,468

 
$
(1,090
)
Cost of goods sold
1,925,180

 
1,925,107

 
73

Selling, general and administrative expenses
879,150

 
880,313

 
(1,163
)
 
For the nine months ended September 30, 2018
 
As Reported
 
Amounts Without Adoption of ASC 606
 
Effect of Change Higher/(Lower)
Income Statement
 
 
 
 
 
Revenue
$
8,873,893

 
$
8,882,558

 
$
(8,665
)
Cost of goods sold
5,460,845

 
5,467,061

 
(6,216
)
Selling, general and administrative expenses
2,472,085

 
2,474,534

 
(2,449
)

We have not included a table of the impact of the balance sheet adjustments on the Unaudited Condensed Consolidated Statement of Cash Flows as the adjustment will net to zero within the operating activities section of this statement.
Under ASC 606, we have elected not to adjust consideration for the effect of a significant financing component at contract inception if the period between the transfer of goods to the customer and payment received from the customer is one year or less. Generally, our payment terms are short term in nature, but in some instances we may offer extended terms to customers exceeding one year such that interest would be accrued with respect to those contracts. The interest that would be accrued related to these contracts is immaterial at September 30, 2018.
Under ASC 340, "Other Assets and Deferred Costs," we have elected to recognize incremental costs of obtaining a contract (commissions earned by our sales representatives on product sales) as an expense when incurred, as we believe the amortization period of the asset would be one year or less due to the short-term nature of our contracts.
Other Recently Adopted Accounting Pronouncements
During the first quarter of 2018, we adopted ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities” (“ASU 2016-01”), which changes how entities will recognize, measure, present and make disclosures about certain financial assets and financial liabilities. The adoption of ASU 2016-01 did not have a significant impact on our financial position, results of operations, cash flows or disclosures.
During the first quarter of 2018, we adopted ASU No. 2016-15, "Classification of Certain Cash Receipts and Cash Payments" ("ASU 2016-15"), which includes guidance on classification for the following items: debt prepayment or debt extinguishment costs, settlement of zero coupon bonds, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims and corporate-owned or bank-owned life insurance policies, distributions received from equity method investees, beneficial interests in securitization transactions, and other separately identifiable cash flows where application of the predominance principle is prescribed. No adjustments were required in our Unaudited Condensed Consolidated Statement of Cash Flows upon adoption. Within our Unaudited Condensed Consolidating Statements of Cash Flows in Note 18, "Condensed Consolidating Financial Information," we now present a new line item, Payments of deferred purchase price on receivables securitization, as a result of adopting ASU 2016-15; prior year cash flow information within this footnote has been recast to reflect the impact of adopting this accounting standard. Other than the addition of this new line item, there was no impact to our Unaudited Condensed Consolidating Statements of Cash Flows upon adoption.
During the first quarter of 2018, we adopted ASU No. 2017-01, "Clarifying the Definition of a Business" (“ASU 2017-01”), which requires an evaluation of whether substantially all of the fair value of assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. If so, the transaction does not qualify as a business. The guidance also requires an acquired business to include at least one substantive process and narrows the definition of outputs.  The adoption of ASU 2017-01 did not have a material impact on our unaudited condensed consolidated financial statements.
During the first quarter of 2018, we adopted ASU No. 2018-02, "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" ("ASU 2018-02"), which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the reduction of the U.S. federal statutory income tax rate to 21% from 35% due to the enactment of the Tax Cuts and Jobs Act of 2017 (the "Tax Act"). In addition, under ASU 2018-02, an entity is required to provide certain disclosures regarding stranded tax effects. ASU 2018-02 is effective for fiscal years and interim periods beginning after December 15, 2018; early adoption is permitted. As a result of the adoption of ASU 2018-02, we recorded a $5 million reclassification to increase Accumulated Other Comprehensive (Loss) Income and decrease Retained Earnings.
During the first quarter of 2018, we adopted ASU No. 2017-07, "Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost" ("ASU 2017-07"), which requires presentation of the current service cost component of net periodic benefit expense with other current compensation expenses for the related employees, and requires presentation of the remaining components of net periodic benefit expense, such as interest, expected return on plan assets, and amortization of actuarial gains and losses, outside of operating income. ASU 2017-07 also specifies that, on a prospective basis, only the service cost component is eligible for capitalization into inventory or other assets. While the income statement classification provisions of ASU 2017-07 are applicable on a retrospective basis, due to the immaterial impact to our Unaudited Condensed Consolidated Statements of Income in prior periods, we did not recast prior period income statement information and adopted the classification provisions on a prospective basis. The change in the capitalization provisions under ASU 2017-07 did not have a material impact on our unaudited condensed consolidated financial statements. See Note 13, "Employee Benefit Plans," for further disclosure on the components of net periodic benefit expense and classification of the components within our Unaudited Condensed Consolidated Statements of Income for the three and nine months ended September 30, 2018 and 2017.
During the third quarter of 2018, the FASB issued ASU No. 2018-15, "Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract" ("ASU 2018-15"). This update requires an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. ASU 2018-15 is effective for fiscal years and interim periods beginning after December 15, 2019; early adoption is permitted. We have adopted ASU 2018-15 in the third quarter of 2018 as we believe that our existing policy is consistent with the new guidance and thus no adjustments were required to be in compliance with this standard update.

Recently Issued Accounting Pronouncements
In February 2016, the FASB issued ASU 2016-02, "Leases" ("ASU 2016-02"), to increase transparency and comparability by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The main difference between current GAAP and ASU 2016-02 is the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under current GAAP. ASU 2016-02 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018. The standard requires that entities apply the effects of these changes using a modified retrospective approach, which includes a number of optional practical expedients. While we are still in the process of quantifying the impact that the adoption of ASU 2016-02 will have on our consolidated financial statements and related disclosures, we anticipate the adoption will materially affect our consolidated balance sheet and disclosures, as the majority of our operating leases will be recorded on the balance sheet under ASU 2016-02. While we do not anticipate the adoption of this accounting standard to have a material impact on our consolidated statements of income at this time, this conclusion may change as we finalize our assessment. In order to assist in our timely implementation of the new standard, we have purchased new software to track our leases. We have engaged a third party to assist with the implementation of the new software with an expectation to complete the implementation by the end of 2018. During the second quarter, we completed phase one of the software roll-out for our North America and Specialty operations. We are nearing completion of the phase one roll-out in our Europe operations as of the filing date of this Quarterly Report on Form 10-Q.
In August 2017, the FASB issued ASU No. 2017-12, "Targeted Improvements to Accounting for Hedging Activities" ("ASU 2017-12"), which amends the hedge accounting recognition and presentation requirements in ASC 815 ("Derivatives and Hedging"). ASU 2017-12 significantly alters the hedge accounting model by making it easier for an entity to achieve and maintain hedge accounting and provides for accounting that better reflects an entity's risk management activities. ASU 2017-12 is effective for fiscal years and interim periods beginning after December 15, 2018; early adoption is permitted. Entities will adopt the provisions of ASU 2017-12 by applying a modified retrospective approach to existing hedging relationships as of the adoption date. At this time, we are still evaluating the impact of this standard on our financial statements.
In August 2018, the FASB issued ASU No. 2018-13, "Disclosure Framework- Changes to the Disclosure Requirements for Fair Value Measurement" ("ASU 2018-13"), which removes, modifies, and adds certain disclosure requirements in ASC 820. ASU 2018-13 is effective for fiscal years and interim periods beginning after December 15, 2019; early adoption is permitted. We are in the process of evaluating the impact of this standard on our disclosures but do not believe that it will have a material impact.
In August 2018, the FASB issued ASU No. 2018-14, "Disclosure Framework- Changes to the Disclosure Requirements for Defined Benefit Plans" ("ASU 2018-14"), which removes, modifies, and adds certain disclosure requirements to ASC 715-20. ASU 2018-14 is effective for fiscal years and interim periods beginning after December 15, 2020; early adoption is permitted. We are in the process of evaluating the impact of this standard on our disclosures.
Financial Statement Information [Line Items]
Financial Statement Information
Allowance for Doubtful Accounts
We have a reserve for uncollectible accounts, which was approximately $63 million and $58 million at September 30, 2018 and December 31, 2017, respectively. Our May 2018 acquisition of Stahlgruber contributed $3 million to our reserve for uncollectible accounts. See Note 2, "Business Combinations" for further information on our acquisitions.
Inventories
Inventories consist of the following (in thousands):
 
September 30,
 
December 31,
 
2018
 
2017
Aftermarket and refurbished products
$
2,287,776

 
$
1,877,653

Salvage and remanufactured products
484,761

 
487,108

Manufactured products
22,357

 
16,022

Total inventories
$
2,794,894

 
$
2,380,783


    Aftermarket and refurbished products and salvage and remanufactured products are primarily composed of finished goods. As of September 30, 2018, manufactured products inventory was composed of $16 million of raw materials, $2 million of work in process, and $4 million of finished goods. As of December 31, 2017, manufactured products inventory was composed of $10 million of raw materials, $2 million of work in process, and $4 million of finished goods.
Our May 2018 acquisition of Stahlgruber contributed $374 million to our aftermarket and refurbished products inventory. See Note 2, "Business Combinations" for further information on our acquisitions.
Property, Plant and Equipment
Property, plant and equipment are recorded at cost less accumulated depreciation. Expenditures for major additions and improvements that extend the useful life of the related asset are capitalized. As property, plant and equipment are sold or retired, the applicable cost and accumulated depreciation are removed from the accounts and any resulting gain or loss thereon is recognized. Construction in progress consists primarily of building and land improvements at our existing facilities. Depreciation is calculated using the straight-line method over the estimated useful lives or, in the case of leasehold improvements, the term of the related lease and reasonably assured renewal periods, if shorter.
Our estimated useful lives are as follows:
Land improvements
10-20 years
Buildings and improvements
20-40 years
Machinery and equipment
3-20 years
Computer equipment and software
3-10 years
Vehicles and trailers
3-10 years
Furniture and fixtures
5-7 years
Property, plant and equipment consists of the following (in thousands):
 
September 30,
 
December 31,
 
2018
 
2017
Land and improvements
$
189,404

 
$
137,790

Buildings and improvements
373,607

 
233,078

Machinery and equipment
618,209

 
521,526

Computer equipment and software
142,719

 
133,753

Vehicles and trailers
177,778

 
161,269

Furniture and fixtures
52,595

 
31,794

Leasehold improvements
283,603

 
257,506

 
1,837,915

 
1,476,716

Less—Accumulated depreciation
(691,086
)
 
(606,112
)
Construction in progress
54,174

 
42,485

Total property, plant and equipment, net
$
1,201,003

 
$
913,089


    
The components of opening property, plant and equipment acquired as part of our acquisition of Stahlgruber in May 2018 are as follows (in thousands):
 
 
 
Gross Amount
Land and improvements
$
47,281

Buildings and improvements
125,649

Machinery and equipment
49,384

Computer equipment and software
3,760

Vehicles and trailers
643

Furniture and fixtures
28,535

Leasehold improvements
1,890

 
257,142

Construction in progress
3,519

Total property, plant and equipment
$
260,661



We record depreciation expense associated with our refurbishing, remanufacturing, manufacturing and furnace operations as well as our distribution centers in Cost of goods sold on the Unaudited Condensed Consolidated Statements of Income. All other depreciation expense is reported in Depreciation and amortization. Total depreciation expense for the three and nine months ended September 30, 2018 was $39 million and $115 million, respectively, and $34 million and $93 million during the three and nine months ended September 30, 2017, respectively.
Intangible Assets
Intangible assets consist primarily of goodwill (the cost of purchased businesses in excess of the fair value of the identifiable net assets acquired) and other specifically identifiable intangible assets, such as trade names, trademarks, customer and supplier relationships, software and other technology related assets, and covenants not to compete.
The changes in the carrying amount of goodwill by reportable segment for the nine months ended September 30, 2018 are as follows (in thousands):
 
North America
 
Europe
 
Specialty
 
Total
Balance as of January 1, 2018
$
1,709,354

 
$
1,414,898

 
$
412,259

 
$
3,536,511

Business acquisitions and adjustments to previously recorded goodwill
1,073

 
1,002,277

 
(5,720
)
 
997,630

Exchange rate effects
(3,049
)
 
(55,901
)
 
75

 
(58,875
)
Balance as of September 30, 2018
$
1,707,378

 
$
2,361,274

 
$
406,614

 
$
4,475,266

During the nine months ended September 30, 2018, we recorded $929 million of goodwill related to our acquisition of Stahlgruber. See Note 2, "Business Combinations" for further information on our acquisitions.
The components of other intangibles, net are as follows (in thousands):
 
September 30, 2018
 
December 31, 2017
Intangible assets subject to amortization
$
872,072

 
$
664,969

Indefinite-lived intangible assets
 
 
 
Trademarks
81,300

 
78,800

Total
$
953,372

 
$
743,769



The components of intangible assets subject to amortization are as follows (in thousands):
 
September 30, 2018
 
December 31, 2017
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Trade names and trademarks
$
495,839

 
$
(88,805
)
 
$
407,034

 
$
327,332

 
$
(75,095
)
 
$
252,237

Customer and supplier relationships
586,221

 
(223,085
)
 
363,136

 
510,113

 
(167,532
)
 
342,581

Software and other technology related assets
172,391

 
(73,760
)
 
98,631

 
124,049

 
(59,081
)
 
64,968

Covenants not to compete
13,488

 
(10,217
)
 
3,271

 
14,981

 
(9,798
)
 
5,183

Total
$
1,267,939

 
$
(395,867
)
 
$
872,072

 
$
976,475

 
$
(311,506
)
 
$
664,969



The components of intangible assets acquired as part of our acquisitions in 2018 are as follows (in thousands):
 
Nine Months Ended
 
September 30, 2018
 
Stahlgruber
 
Other Acquisitions
 
Total
Trade names and trademarks
$
173,946

 
$
2,895

 
$
176,841

Customer and supplier relationships
78,239

 
8,194

 
86,433

Software and other technology related assets
33,344

 
92

 
33,436

Total
$
285,529

 
$
11,181

 
$
296,710


    
The weighted-average amortization periods for our intangible assets acquired during the nine months ended September 30, 2018 and the year ended December 31, 2017 are as follows (in years):
 
Nine Months Ended
 
Year Ended
 
September 30, 2018
 
December 31, 2017
 
Stahlgruber
 
Other Acquisitions
 
Total
 
All Acquisitions
Trade names and trademarks
19.9
 
20.0
 
19.9
 
11.2
Customer and supplier relationships
3.0
 
9.6
 
3.6
 
18.6
Software and other technology related assets
6.8
 
6.0
 
6.8
 
11.1
Covenants not to compete
-
 
-
 
-
 
4.4
Total acquired finite-lived intangible assets
13.7
 
12.2
 
13.7
 
16.5

Our estimated useful lives for our finite-lived intangible assets are as follows:
 
Method of Amortization
 
Useful Life
Trade names and trademarks
Straight-line
 
4-30 years
Customer and supplier relationships
Accelerated
 
3-20 years
Software and other technology related assets
Straight-line
 
3-15 years
Covenants not to compete
Straight-line
 
2-5 years

Amortization expense for intangibles was $42 million and $96 million during the three and nine months ended September 30, 2018, respectively, and $26 million and $74 million during the three and nine months ended September 30, 2017, respectively. Estimated amortization expense for each of the five years in the period ending December 31, 2022 is $40 million (for the remaining three months of 2018), $136 million, $104 million, $75 million and $62 million, respectively.
Investments in Unconsolidated Subsidiaries
Our investment in unconsolidated subsidiaries was $157 million and $208 million as of September 30, 2018 and December 31, 2017, respectively. On December 1, 2016, we acquired a 26.5% equity interest in Mekonomen AB ("Mekonomen") for an aggregate purchase price of $181 million. Headquartered in Stockholm, Sweden, Mekonomen is the leading independent car parts and service chain in the Nordic region of Europe, offering a range of products including spare parts and accessories for cars, and workshop services for consumers and businesses. As a result of the investment, we nominated two representatives for election to Mekonomen's board of directors; both representatives were subsequently elected to and continue to serve on the board of directors, including one as the chairman of the board. We are accounting for our interest in Mekonomen using the equity method of accounting, as our investment gives us the ability to exercise significant influence, but not control, over the investee. As of September 30, 2018, the book value of our investment in Mekonomen exceeded our share of the book value of Mekonomen's net assets by $64 million; this difference is primarily related to goodwill and the fair value of other intangible assets. We are recording our equity in the net earnings of Mekonomen on a one quarter lag. We recorded equity losses of $20 million and $18 million during the three and nine months ended September 30, 2018, respectively, and equity in earnings of $3 million and $5 million during the three and nine months ended September 30, 2017 related to our investment in Mekonomen, including adjustments to convert the results to GAAP and to recognize the impact of our purchase accounting adjustments. In May 2018 and May 2017, we received cash dividends of $8 million (SEK 67 million) and $7 million (SEK 67 million), respectively, related to our investment in Mekonomen.
On July 6, 2018, Mekonomen announced the acquisition of two automotive spare parts distributors in Denmark and Poland. The objective of the acquisition is to strengthen Mekonomen's position in the sale of automotive spare parts in northern Europe and to establish a strong market position in Denmark and Poland, where Mekonomen has no current operations. The acquisition is partially being financed by a rights issue with preferential rights for Mekonomen's existing shareholders, who were given the right to subscribe for four new Mekonomen shares per seven existing owned shares at a discounted share price. On October 5, 2018, we subscribed for our pro rata share in the rights issue giving us the right to acquire an additional $48 million of equity in Mekonomen at a discounted share price, retaining our 26.5% equity interest. We recorded a derivative instrument of $29 million in Other assets on our Unaudited Condensed Consolidated Balance Sheets, which represents our right to acquire Mekonomen shares at a discount. We are measuring the derivative instrument at fair value, and we recorded a $3 million gain on our fair value remeasurement during the three months ended September 30, 2018; the gain is recorded in Other income, net on the Unaudited Condensed Consolidated Statements of Income. In the fourth quarter, we will record an $8 million loss related to the settlement of the derivative instrument in October 2018 due to a decrease in the Mekonomen share price from the last day of the third quarter to the settlement date.
We evaluated our investment in Mekonomen for other-than-temporary impairment as of September 30, 2018, and concluded the decline in fair value was other-than-temporary due to a prolonged and significant stock price decrease. Therefore, we recognized an other-than-temporary impairment of $23 million, which represents the difference in the carrying value and the fair value of our investment in Mekonomen. The fair value of our investment in Mekonomen was determined using the Mekonomen share price as of September 30, 2018. The impairment charge is recorded in Equity in (losses) earnings of unconsolidated subsidiaries in our Unaudited Condensed Consolidated Statements of Income. Equity in losses and earnings from our investment in Mekonomen are reported in the Europe segment. As a result of the impairment charge, the Level 1 fair value of our equity investment in the publicly traded Mekonomen common stock at September 30, 2018 approximated the carrying value of $134 million.
Warranty Reserve
Some of our salvage mechanical products are sold with a standard six month warranty against defects. Additionally, some of our remanufactured engines are sold with a standard three year warranty against defects. We also provide a limited lifetime warranty for certain of our aftermarket products. These assurance-type warranties are not considered a separate performance obligation, and thus no transaction price is allocated to them. We record the warranty costs in Cost of goods sold on our Unaudited Condensed Consolidated Statements of Income. Our warranty reserve is calculated using historical claim information to project future warranty claims activity and is recorded within Other accrued expenses and Other noncurrent liabilities on our Unaudited Condensed Consolidated Balance Sheets based on the expected timing of the related payments.
The changes in the warranty reserve are as follows (in thousands):
Balance as of December 31, 2017
$
23,151

Warranty expense
33,670

Warranty claims
(31,980
)
Balance as of September 30, 2018
$
24,841


Recent Accounting Pronouncements
Adoption of New Revenue Standard
In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2014-09, "Revenue from Contracts with Customers" ("ASU 2014-09"). This update outlines a new comprehensive revenue recognition model that supersedes the prior revenue recognition guidance and requires companies to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The FASB has issued several updates to ASU 2014-09, which collectively with ASU 2014-09, represent the FASB Accounting Standards Codification Topic 606 (“ASC 606”). On January 1, 2018, we adopted ASC 606 for all contracts using the modified retrospective method, which means the historical periods are presented under the previous revenue standards with the cumulative net income effect being adjusted through retained earnings.
Most of the changes resulting from our adoption of ASC 606 were changes in presentation within the Unaudited Condensed Consolidated Balance Sheets and the Unaudited Condensed Consolidated Statements of Income. Therefore, while we made adjustments to certain opening balances on our January 1, 2018 balance sheet, we made no adjustments to opening retained earnings. We expect the impact of the adoption of ASC 606 to be immaterial to our net income on an ongoing basis. See Note 5, "Revenue Recognition" for the required disclosures under ASC 606.
With the adoption of ASC 606, we reclassified certain amounts related to variable consideration. Under ASC 606, we are required to present a refund liability and a returns asset within the Unaudited Condensed Consolidated Balance Sheet, whereas in periods prior to adoption, we presented the estimated margin impact of expected returns as a contra-asset within accounts receivable. Additionally, under ASC 606, the changes in the refund liability are reported in revenue, and the changes in the returns assets are reported in Cost of goods sold on the Unaudited Condensed Consolidated Statements of Income. Prior to adoption, the change in the reserve for returns was generally reported as a net amount within revenue. As a result, the income statement presentation was adjusted concurrently with the balance sheet change beginning in 2018.
The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASC 606 was as follows (in thousands):
 
Balance as of December 31, 2017
 
Adjustments Due to ASC 606
 
Balance as of January 1, 2018
Balance Sheet
 
 
 
 
 
Assets
 
 
 
 
 
Accounts receivable
$
1,027,106

 
$
38,511

 
$
1,065,617

Prepaid expenses and other current assets
134,479

 
44,508

 
178,987

Liabilities
 
 
 
 
 
Refund liability

 
83,019

 
83,019


The impact of the adoption of ASC 606 on our Unaudited Condensed Consolidated Balance Sheet as of September 30, 2018 and our Unaudited Condensed Consolidated Statements of Income for the three and nine months ended September 30, 2018 was as follows (in thousands):
 
Balance as of September 30, 2018
 
As Reported
 
Amounts Without Adoption of ASC 606
 
Effect of Change Higher/(Lower)
Balance Sheet
 
 
 
 
 
Assets
 
 
 
 
 
Accounts receivable
$
1,255,876

 
$
1,205,833

 
$
50,043

Prepaid expenses and other current assets
200,944

 
144,255

 
56,689

Liabilities
 
 
 
 
 
Refund liability
106,732

 

 
106,732

 
For the three months ended September 30, 2018
 
As Reported
 
Amounts Without Adoption of ASC 606
 
Effect of Change Higher/(Lower)
Income Statement
 
 
 
 
 
Revenue
$
3,122,378

 
$
3,123,468

 
$
(1,090
)
Cost of goods sold
1,925,180

 
1,925,107

 
73

Selling, general and administrative expenses
879,150

 
880,313

 
(1,163
)
 
For the nine months ended September 30, 2018
 
As Reported
 
Amounts Without Adoption of ASC 606
 
Effect of Change Higher/(Lower)
Income Statement
 
 
 
 
 
Revenue
$
8,873,893

 
$
8,882,558

 
$
(8,665
)
Cost of goods sold
5,460,845

 
5,467,061

 
(6,216
)
Selling, general and administrative expenses
2,472,085

 
2,474,534

 
(2,449
)

We have not included a table of the impact of the balance sheet adjustments on the Unaudited Condensed Consolidated Statement of Cash Flows as the adjustment will net to zero within the operating activities section of this statement.
Under ASC 606, we have elected not to adjust consideration for the effect of a significant financing component at contract inception if the period between the transfer of goods to the customer and payment received from the customer is one year or less. Generally, our payment terms are short term in nature, but in some instances we may offer extended terms to customers exceeding one year such that interest would be accrued with respect to those contracts. The interest that would be accrued related to these contracts is immaterial at September 30, 2018.
Under ASC 340, "Other Assets and Deferred Costs," we have elected to recognize incremental costs of obtaining a contract (commissions earned by our sales representatives on product sales) as an expense when incurred, as we believe the amortization period of the asset would be one year or less due to the short-term nature of our contracts.
Other Recently Adopted Accounting Pronouncements
During the first quarter of 2018, we adopted ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities” (“ASU 2016-01”), which changes how entities will recognize, measure, present and make disclosures about certain financial assets and financial liabilities. The adoption of ASU 2016-01 did not have a significant impact on our financial position, results of operations, cash flows or disclosures.
During the first quarter of 2018, we adopted ASU No. 2016-15, "Classification of Certain Cash Receipts and Cash Payments" ("ASU 2016-15"), which includes guidance on classification for the following items: debt prepayment or debt extinguishment costs, settlement of zero coupon bonds, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims and corporate-owned or bank-owned life insurance policies, distributions received from equity method investees, beneficial interests in securitization transactions, and other separately identifiable cash flows where application of the predominance principle is prescribed. No adjustments were required in our Unaudited Condensed Consolidated Statement of Cash Flows upon adoption. Within our Unaudited Condensed Consolidating Statements of Cash Flows in Note 18, "Condensed Consolidating Financial Information," we now present a new line item, Payments of deferred purchase price on receivables securitization, as a result of adopting ASU 2016-15; prior year cash flow information within this footnote has been recast to reflect the impact of adopting this accounting standard. Other than the addition of this new line item, there was no impact to our Unaudited Condensed Consolidating Statements of Cash Flows upon adoption.
During the first quarter of 2018, we adopted ASU No. 2017-01, "Clarifying the Definition of a Business" (“ASU 2017-01”), which requires an evaluation of whether substantially all of the fair value of assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. If so, the transaction does not qualify as a business. The guidance also requires an acquired business to include at least one substantive process and narrows the definition of outputs.  The adoption of ASU 2017-01 did not have a material impact on our unaudited condensed consolidated financial statements.
During the first quarter of 2018, we adopted ASU No. 2018-02, "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" ("ASU 2018-02"), which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the reduction of the U.S. federal statutory income tax rate to 21% from 35% due to the enactment of the Tax Cuts and Jobs Act of 2017 (the "Tax Act"). In addition, under ASU 2018-02, an entity is required to provide certain disclosures regarding stranded tax effects. ASU 2018-02 is effective for fiscal years and interim periods beginning after December 15, 2018; early adoption is permitted. As a result of the adoption of ASU 2018-02, we recorded a $5 million reclassification to increase Accumulated Other Comprehensive (Loss) Income and decrease Retained Earnings.
During the first quarter of 2018, we adopted ASU No. 2017-07, "Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost" ("ASU 2017-07"), which requires presentation of the current service cost component of net periodic benefit expense with other current compensation expenses for the related employees, and requires presentation of the remaining components of net periodic benefit expense, such as interest, expected return on plan assets, and amortization of actuarial gains and losses, outside of operating income. ASU 2017-07 also specifies that, on a prospective basis, only the service cost component is eligible for capitalization into inventory or other assets. While the income statement classification provisions of ASU 2017-07 are applicable on a retrospective basis, due to the immaterial impact to our Unaudited Condensed Consolidated Statements of Income in prior periods, we did not recast prior period income statement information and adopted the classification provisions on a prospective basis. The change in the capitalization provisions under ASU 2017-07 did not have a material impact on our unaudited condensed consolidated financial statements. See Note 13, "Employee Benefit Plans," for further disclosure on the components of net periodic benefit expense and classification of the components within our Unaudited Condensed Consolidated Statements of Income for the three and nine months ended September 30, 2018 and 2017.
During the third quarter of 2018, the FASB issued ASU No. 2018-15, "Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract" ("ASU 2018-15"). This update requires an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. ASU 2018-15 is effective for fiscal years and interim periods beginning after December 15, 2019; early adoption is permitted. We have adopted ASU 2018-15 in the third quarter of 2018 as we believe that our existing policy is consistent with the new guidance and thus no adjustments were required to be in compliance with this standard update.

Recently Issued Accounting Pronouncements
In February 2016, the FASB issued ASU 2016-02, "Leases" ("ASU 2016-02"), to increase transparency and comparability by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The main difference between current GAAP and ASU 2016-02 is the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under current GAAP. ASU 2016-02 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018. The standard requires that entities apply the effects of these changes using a modified retrospective approach, which includes a number of optional practical expedients. While we are still in the process of quantifying the impact that the adoption of ASU 2016-02 will have on our consolidated financial statements and related disclosures, we anticipate the adoption will materially affect our consolidated balance sheet and disclosures, as the majority of our operating leases will be recorded on the balance sheet under ASU 2016-02. While we do not anticipate the adoption of this accounting standard to have a material impact on our consolidated statements of income at this time, this conclusion may change as we finalize our assessment. In order to assist in our timely implementation of the new standard, we have purchased new software to track our leases. We have engaged a third party to assist with the implementation of the new software with an expectation to complete the implementation by the end of 2018. During the second quarter, we completed phase one of the software roll-out for our North America and Specialty operations. We are nearing completion of the phase one roll-out in our Europe operations as of the filing date of this Quarterly Report on Form 10-Q.
In August 2017, the FASB issued ASU No. 2017-12, "Targeted Improvements to Accounting for Hedging Activities" ("ASU 2017-12"), which amends the hedge accounting recognition and presentation requirements in ASC 815 ("Derivatives and Hedging"). ASU 2017-12 significantly alters the hedge accounting model by making it easier for an entity to achieve and maintain hedge accounting and provides for accounting that better reflects an entity's risk management activities. ASU 2017-12 is effective for fiscal years and interim periods beginning after December 15, 2018; early adoption is permitted. Entities will adopt the provisions of ASU 2017-12 by applying a modified retrospective approach to existing hedging relationships as of the adoption date. At this time, we are still evaluating the impact of this standard on our financial statements.
In August 2018, the FASB issued ASU No. 2018-13, "Disclosure Framework- Changes to the Disclosure Requirements for Fair Value Measurement" ("ASU 2018-13"), which removes, modifies, and adds certain disclosure requirements in ASC 820. ASU 2018-13 is effective for fiscal years and interim periods beginning after December 15, 2019; early adoption is permitted. We are in the process of evaluating the impact of this standard on our disclosures but do not believe that it will have a material impact.
In August 2018, the FASB issued ASU No. 2018-14, "Disclosure Framework- Changes to the Disclosure Requirements for Defined Benefit Plans" ("ASU 2018-14"), which removes, modifies, and adds certain disclosure requirements to ASC 715-20. ASU 2018-14 is effective for fiscal years and interim periods beginning after December 15, 2020; early adoption is permitted. We are in the process of evaluating the impact of this standard on our disclosures.