10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2017

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: 001-13718

MDC Partners Inc.

(Exact name of registrant as specified in its charter)

Canada	98-0364441
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)
745 Fifth Avenue New York, New York	10151
(Address of principal executive offices)	(Zip Code)

(646) 429-1800

(Registrant’s telephone number, including area code)

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   ý   No   ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted 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 and post such files).  Yes   ý No   ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer; a non-accelerated filer or a smaller reporting 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  ¨  (Do not check if a smaller reporting company)	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   ý

The numbers of shares outstanding as of October 27, 2017 were: 58,357,062 Class A subordinate voting shares, 3,755 Class B multiple voting shares, and 95,000 Series 4 Convertible Preference Shares.

MDC PARTNERS INC.

QUARTERLY REPORT ON FORM 10-Q

TABLE OF CONTENTS

		Page
	PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements	3
	Condensed Consolidated Statements of Operations (unaudited) for the Three and Nine Months Ended September 30, 2017 and 2016	3
	Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) for the Three and Nine Months Ended September 30, 2017 and 2016	4
	Condensed Consolidated Balance Sheets as of September 30, 2017 (unaudited) and December 31, 2016	5
	Condensed Consolidated Statements of Cash Flows (unaudited) for the Nine Months Ended September 30, 2017 and 2016	6
	Condensed Consolidated Statements of Shareholders’ Deficit (unaudited) for the Nine Months Ended September 30, 2017	7
	Notes to Unaudited Condensed Consolidated Financial Statements	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	27
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	62
Item 4.	Controls and Procedures	63
	PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	65
Item 1A.	Risk Factors	65
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	65
Item 3.	Defaults Upon Senior Securities	65
Item 4.	Mine Safety Disclosures	65
Item 5.	Exhibits	65
Signatures		66

2

PART I. FINANCIAL INFORMATION

Item 1.    Financial Statements

MDC PARTNERS INC. AND SUBSIDIARIES

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(thousands of United States dollars, except per share amounts)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Revenue:
Services	$	375,800		$	349,254		$	1,111,032		$	995,343
Operating expenses:
Cost of services sold	249,418			235,659			754,803			675,940
Office and general expenses	77,910			83,303			251,313			233,840
Depreciation and amortization	11,252			11,412			32,916			34,068
Goodwill impairment	—			29,631			—			29,631
	338,580			360,005			1,039,032			973,479
Operating profit (loss)	37,220			(10,751		)	72,000			21,864
Other income (expense):
Other, net	8,649			(6,008		)	17,812			9,530
Interest expense and finance charges	(16,403		)	(16,540		)	(48,859		)	(49,289		)
Loss on redemption of notes	—			—			—			(33,298		)
Interest income	145			218			550			599
	(7,609		)	(22,330		)	(30,497		)	(72,458		)
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates	29,611			(33,081		)	41,503			(50,594		)
Income tax expense (benefit)	9,049			(1,930		)	17,659			1,180
Income (loss) before equity in earnings of non-consolidated affiliates	20,562			(31,151		)	23,844			(51,774		)
Equity in earnings of non-consolidated affiliates	1,422			70			1,924			9
Net income (loss)	21,984			(31,081		)	25,768			(51,765		)
Net income attributable to noncontrolling interests	(3,491		)	(1,059		)	(6,588		)	(3,172		)
Net income (loss) attributable to MDC Partners Inc.	18,493			(32,140		)	19,180			(54,937		)
Accretion on convertible preference shares	(1,948		)	—			(4,365		)	—
Net income (loss) attributable to MDC Partners Inc. common shareholders	$	16,545		$	(32,140	)	$	14,815		$	(54,937	)
Income (loss) per common share:
Basic
Net income (loss) attributable to MDC Partners Inc. common shareholders	$	0.25		$	(0.62	)	$	0.24		$	(1.08	)
Diluted
Net income (loss) attributable to MDC Partners Inc. common shareholders	$	0.24		$	(0.62	)	$	0.24		$	(1.08	)
Weighted average number of common shares outstanding:
Basic	57,566,707			52,244,819			53,915,536			50,861,890
Diluted	57,943,080			52,244,819			54,228,208			50,861,890
Stock-based compensation expense is included in the following line items above:
Cost of services sold	$	5,310		$	3,026		$	12,558		$	10,393
Office and general expenses	1,070			2,202			4,312			5,050
Total	$	6,380		$	5,228		$	16,870		$	15,443

See notes to the unaudited condensed consolidated financial statements.

3

MDC PARTNERS INC. AND SUBSIDIARIES

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(thousands of United States dollars)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Comprehensive income (loss)
Net income (loss)	$	21,984		$	(31,081	)	$	25,768		$	(51,765	)
Other comprehensive (loss) income, net of applicable tax:
Foreign currency translation adjustment	(1,912		)	2,331			(1,294		)	(8,354		)
Other comprehensive income (loss)	(1,912		)	2,331			(1,294		)	(8,354		)
Comprehensive income (loss) for the period	20,072			(28,750		)	24,474			(60,119		)
Comprehensive income attributable to the noncontrolling interests	(4,695		)	(569		)	(9,063		)	(4,481		)
Comprehensive income (loss) attributable to MDC Partners Inc.	$	15,377		$	(29,319	)	$	15,411		$	(64,600	)

See notes to the unaudited condensed consolidated financial statements.

4

MDC PARTNERS INC. AND SUBSIDIARIES

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS

(thousands of United States dollars)

	September 30, 2017			December 31, 2016
	(Unaudited)
ASSETS
Current assets:
Cash and cash equivalents	$	18,861		$	27,921
Cash held in trusts	5,182			5,341
Accounts receivable, less allowance for doubtful accounts of $2,800 and $1,523	438,765			388,340
Expenditures billable to clients	42,332			33,118
Other current assets	27,647			34,862
Total current assets	532,787			489,582
Fixed assets, at cost, less accumulated depreciation of $118,241 and $105,134	91,153			78,377
Investments in non-consolidated affiliates	5,655			4,745
Goodwill	839,361			844,759
Other intangible assets, net	74,685			85,071
Deferred tax assets	39,598			41,793
Other assets	34,592			33,051
Total assets	$	1,617,831		$	1,577,378
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS, AND SHAREHOLDERS’ DEFICIT
Current liabilities:
Accounts payable	$	232,704		$	251,456
Trust liability	5,182			5,341
Accruals and other liabilities	289,471			303,581
Advance billings	165,600			133,925
Current portion of long-term debt	300			228
Current portion of deferred acquisition consideration	59,849			108,290
Total current liabilities	753,106			802,821
Long-term debt, less current portion	930,889			936,208
Long-term portion of deferred acquisition consideration	88,419			121,274
Other liabilities	54,657			56,012
Deferred tax liabilities	119,602			110,359
Total liabilities	1,946,673			2,026,674
Redeemable noncontrolling interests (Note 2)	60,092			60,180
Commitments, contingencies, and guarantees (Note 12)
Shareholders’ deficit:
Convertible preference shares (liquidation preference $99,365)	90,220			—
Common shares	351,075			317,784
Shares to be issued, 100,000 shares in 2016	—			2,360
Charges in excess of capital	(307,454		)	(311,581		)
Accumulated deficit	(562,668		)	(581,848		)
Accumulated other comprehensive loss	(5,593		)	(1,824		)
MDC Partners Inc. shareholders’ deficit	(434,420		)	(575,109		)
Noncontrolling interests	45,486			65,633
Total shareholders’ deficit	(388,934		)	(509,476		)
Total liabilities, redeemable noncontrolling interests, and shareholders’ deficit	$	1,617,831		$	1,577,378

See notes to the unaudited condensed consolidated financial statements.

5

MDC PARTNERS INC. AND SUBSIDIARIES

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(thousands of United States dollars)

	Nine Months Ended September 30,
	2017			2016
Cash flows from operating activities:
Net income (loss)	$	25,768		$	(51,765	)
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Stock-based compensation	16,870			15,443
Depreciation	18,000			16,853
Amortization of intangibles	14,916			17,215
Amortization of deferred finance charges	2,018			8,736
Goodwill impairment	—			29,631
Loss on redemption of notes	—			26,873
Adjustment to deferred acquisition consideration	13,354			17,363
Deferred income tax	8,125			(553		)
Loss on sale of assets	1,245			377
Earnings of non-consolidated affiliates	(1,924		)	(9		)
Other non-current assets and liabilities	(4,388		)	1,853
Foreign exchange	(15,113		)	(12,806		)
Changes in working capital:
Accounts receivable	(54,723		)	(47,767		)
Expenditures billable to clients	(9,294		)	5,551
Prepaid expenses and other current assets	6,400			(16,851		)
Accounts payable, accruals and other liabilities	(31,149		)	(77,355		)
Advance billings	32,015			25,824
Net cash provided by (used in) operating activities	22,120			(41,387		)
Cash flows used in investing activities:
Capital expenditures	(28,305		)	(19,723		)
Deposits	(1,461		)	—
Acquisitions, net of cash acquired	—			2,531
Proceeds from sale of assets	11,120			215
Distributions from non-consolidated affiliates	673			4,885
Other investments	(1,530		)	(2,571		)
Net cash used in investing activities	(19,503		)	(14,663		)
Cash flows (used in) provided by financing activities:
Proceeds from issuance of 6.50% Notes	—			900,000
Repayment of 6.75% Notes	—			(735,000		)
Repayments of revolving credit agreement	(1,093,508		)	(1,255,608		)
Proceeds from revolving credit agreement	1,087,688			1,326,105
Proceeds from issuance of convertible preference shares	95,000			—
Convertible preference shares issuance costs	(4,632		)	—
Acquisition related payments	(89,126		)	(129,616		)
Repayment of long-term debt	(310		)	(381		)
Purchase of shares	(1,239		)	(2,798		)
Premium paid on redemption of notes	—			(26,873		)
Deferred financing costs	—			(21,569		)
Distributions to noncontrolling interests	(5,272		)	(6,549		)
Payment of dividends	(284		)	(32,580		)
Net cash (used in) provided by financing activities	(11,683		)	15,131
Effect of exchange rate changes on cash and cash equivalents	6			1,196
Decrease in cash and cash equivalents	(9,060		)	(39,723		)
Cash and cash equivalents at beginning of period	27,921			61,458
Cash and cash equivalents at end of period	$	18,861		$	21,735
Supplemental disclosures:
Cash income taxes paid	$	6,909		$	2,798
Cash interest paid	$	32,324		$	27,979
Change in cash held in trusts	$	(159	)	$	147
Non-cash transactions:
Capital leases	$	621		$	—
Dividends payable	$	453		$	1,077
Deferred acquisition consideration settled through issuance of shares	$	28,727		$	10,458
Value of shares issued for acquisition	$	—		$	34,219
Leasehold improvements paid for directly by landlord	$	—		$	7,250

See notes to the unaudited condensed consolidated financial statements.

6

MDC PARTNERS INC. AND SUBSIDIARIES

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ DEFICIT

(thousands of United States dollars)

	Convertible Preference Shares			Common Shares					Share Capital to Be Issued					Additional Paid-in Capital			Charges in Excess of Capital			Accumulated Deficit			Accumulated Other Comprehensive Loss			MDC Partners Inc. Shareholders’ Deficit			Noncontrolling Interests			Total Shareholders’ Deficit
	Shares	Amount		Shares		Amount			Shares		Amount
Balance at December 31, 2016	—	$	—	52,802,058		$	317,784		100,000		$	2,360		$	—		$	(311,581	)	$	(581,848	)	$	(1,824	)	$	(575,109	)	$	65,633		$	(509,476	)
Net income attributable to MDC Partners Inc.	—	—		—		—			—		—			—			—			19,180			—			19,180			—			19,180
Other comprehensive income (loss)	—	—		—		—			—		—			—			—			—			(3,769		)	(3,769		)	2,475			(1,294		)
Issuance of Series 4 convertible preference shares in private placement	95,000	90,220		—		—			—		—			—			—			—			—			90,220			—			90,220
Issuance of restricted stock	—	—		273,169		5,803			—		—			(5,803		)	—			—			—			—			—			—
Shares acquired and canceled	—	—		(114,822	)	(1,239		)	—		—			—			—			—			—			(1,239		)	—			(1,239		)
Deferred acquisition consideration settled through issuance of shares	—	—		3,353,939		28,727			(100,000	)	(2,360		)	1,485			—			—			—			27,852			—			27,852
Stock-based compensation	—	—		—		—			—		—			6,082			—			—			—			6,082			—			6,082
Changes in redemption value of redeemable noncontrolling interests	—	—		—		—			—		—			(300		)	—			—			—			(300		)				(300		)
Decrease in noncontrolling interests and redeemable noncontrolling interests from business acquisitions and step-up transactions	—	—		—		—			—		—			2,315			—			—			—			2,315			(11,965		)	(9,650		)
Dispositions	—	—		—		—			—		—			—			—			—			—			—			(10,657		)	(10,657		)
Other	—	—		—		—			—		—			348			—			—			—			348						348
Transfer to charges in excess of capital	—	—		—		—			—		—			(4,127		)	4,127			—			—			—			—			—
Balance at September 30, 2017	95,000	$	90,220	56,314,344		$	351,075		—		$	—		$	—		$	(307,454	)	$	(562,668	)	$	(5,593	)	$	(434,420	)	$	45,486		$	(388,934	)

See notes to the unaudited condensed consolidated financial statements.

7

MDC PARTNERS INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(thousands of United States dollars, except per share amounts, unless otherwise stated)

1. Basis of Presentation

MDC Partners Inc. (the “Company” or “MDC”) has prepared the unaudited condensed consolidated interim financial statements included herein pursuant to the rules and regulations of the United States Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with generally accepted accounting principles of the United States of America (“U.S. GAAP”) have been condensed or omitted pursuant to these rules.

The accompanying financial statements reflect all adjustments, consisting of normally recurring accruals, which in the opinion of management are necessary for a fair presentation, in all material respects, of the information contained therein. Results of operations for interim periods are not necessarily indicative of annual results.

References herein to “Partner Firms” generally refer to the Company’s subsidiary agencies.

These statements should be read in conjunction with the consolidated financial statements and related notes thereto included in the Company’s Annual Report on Amendment No. 1 on Form 10-K/A (the "Annual Report on Form 10-K/A") for the year ended December 31, 2016.

2. Significant Accounting Policies

The Company’s significant accounting policies are summarized as follows:

Principles of Consolidation. The accompanying condensed consolidated financial statements include the accounts of MDC Partners Inc. and its domestic and international controlled subsidiaries that are not considered variable interest entities, and variable interest entities for which the Company is the primary beneficiary. Intercompany balances and transactions have been eliminated in consolidation.

Reclassifications. Certain reclassifications have been made to the prior period financial statements to conform to the current period presentation. During the nine months ended September 30, 2017, the Company changed the presentation of book overdrafts on its statement of cash flows to classify the associated cash flows as operating activities. Book overdrafts were previously presented within financing activities. This resulted in cash inflows of $17,532 being reclassified from financing activities to operating activities for the nine months ended September 30, 2016. There was no impact on the Company’s consolidated statements of operations, comprehensive income (loss), or balance sheets.

Use of Estimates. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities including goodwill, intangible assets, contingent deferred acquisition consideration, valuation allowances for receivables, deferred tax assets and the amounts of revenue and expenses reported during the period. These estimates are evaluated on an ongoing basis and are based on historical experience, current conditions and various other assumptions believed to be reasonable under the circumstances. Actual results could differ from these estimates.

Fair Value. The Company applies the fair value measurement guidance of the Financial Accounting Standards Board (the “FASB”) Accounting Standards Codification (the “ASC”) Topic 820, Fair Value Measurements, for financial assets and liabilities that are required to be measured at fair value and for non-financial assets and liabilities that are not required to be measured at fair value on a recurring basis, including goodwill and other identifiable intangible assets. The measurement of fair value requires the use of techniques based on observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect market assumptions. The inputs create the following fair value hierarchy:

• Level 1 - Quoted prices for identical instruments in active markets.

• Level 2 - Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations where inputs are observable or where significant value drivers are observable.

• Level 3 - Instruments where significant value drivers are unobservable to third parties.

When available, the Company uses quoted market prices to determine the fair value of its financial instruments and classifies such items in Level 1. In some cases, quoted market prices are used for similar instruments in active markets and the Company classifies such items in Level 2.

Concentration of Credit Risk. The Company provides marketing communications services to clients who operate in most industry sectors. Credit is granted to qualified clients in the ordinary course of business. Due to the diversified nature of the Company’s client base, the Company does not believe that it is exposed to a concentration of credit risk. No client accounted for

8

more than 10% of the Company’s consolidated accounts receivable at September 30, 2017 and December 31, 2016. No client accounted for 10% of the Company’s revenue for the three and nine months ended September 30, 2017 or the three and nine months ended September 30, 2016.

Cash and Cash Equivalents. The Company’s cash equivalents are primarily comprised of investments in overnight interest-bearing deposits, commercial paper and money market instruments and other short-term investments with original maturity dates of three months or less at the time of purchase. The Company has a concentration of credit risk in that there are cash deposits in excess of federally insured amounts.

Cash in Trust. A subsidiary of the Company holds restricted cash in trust accounts related to funds received on behalf of clients.  Such amounts are held in escrow under depositary service agreements and distributed at the direction of the clients.  The funds are presented as a corresponding liability on the balance sheet.

Allowance for Doubtful Accounts.  Trade receivables are stated at invoiced amounts less allowances for doubtful accounts. The allowances represent estimated uncollectible receivables associated with potential customer defaults usually due to customers’ potential insolvency. The allowances include amounts for certain customers where a risk of default has been specifically identified. The assessment of the likelihood of customer defaults is based on various factors, including the length of time the receivables are past due, historical experience and existing economic conditions.

Expenditures Billable to Clients.  Expenditures billable to clients consist principally of outside vendor costs incurred on behalf of clients when providing advertising, marketing and corporate communications services that have not yet been invoiced to clients. Such amounts are invoiced to clients at various times over the course of the production process.

Fixed Assets.  Fixed assets are stated at cost, net of accumulated depreciation. Computers, furniture and fixtures are depreciated on a straight-line basis over periods of three to seven years. Leasehold improvements are depreciated on a straight-line basis over the lesser of the term of the related lease or the estimated useful life of the asset. Repairs and maintenance costs are expensed as incurred.

Equity Method Investments. The equity method is used to account for investments in entities in which the Company has an ownership interest of less than 50% and has significant influence, or joint control by contractual arrangement, (i) over the operating and financial policies of the affiliate or (ii) has an ownership interest greater than 50%; however, the substantive participating rights of the noncontrolling interest shareholders preclude the Company from exercising unilateral control over the operating and financial policies of the affiliate. The Company’s investments that were accounted for using the equity method include a 30% undivided interest in a real estate joint venture and various interests in investment funds. The Company’s management periodically evaluates these investments to determine if there has been a decline in value that is other than temporary. These investments are included in investments in non-consolidated affiliates on the balance sheet.

Cost Method Investments. From time to time, the Company makes non-material cost based investments in start-up advertising technology companies and innovative consumer product companies where the Company does not exercise significant influence over the operating and financial policies of the investee. The total net cost basis of these investments, which is included in other assets on the balance sheet as of September 30, 2017 and December 31, 2016, was $10,350 and $10,132, respectively. These investments are periodically evaluated to determine whether a significant event or change in circumstances has occurred that may impact the fair value of each investment other than temporary declines below book value. A variety of factors are considered when determining if a decline is other than temporary, including, among others, the financial condition and prospects of the investee, as well as the Company’s investment intent.  In addition, the Company’s partner agencies may receive minority equity interests from start-up companies in lieu of fees.

Goodwill and Indefinite Lived Intangibles. In accordance with the FASB ASC Topic 350, Intangibles - Goodwill and Other, goodwill and indefinite lived intangible assets (trademarks) acquired as a result of a business combination, which are not subject to amortization, are tested for impairment annually as of October 1st of each year, or more frequently if indicators of potential impairment exist. For goodwill, impairment is assessed at the reporting unit level. For the nine months ended September 30, 2017 and the year ended December 31, 2016, goodwill was $839,361 and $844,759, respectively. For the three and nine months endedSeptember 30, 2017, there was a reduction in goodwill of $17,593 relating to the sale of certain subsidiaries, which was offset by $12,195 net foreign exchange translation adjustments. As a result of the these transactions, the Company performed interim goodwill testing on two reporting units and determined that there was no impairment charge in respect to the impacted reporting units. For the three and nine months endedSeptember 30, 2016, due to triggering events during the third quarter of 2016, the Company performed an interim goodwill impairment test and recognized goodwill impairment of $29,631. In addition, in the third quarter of 2016, the Company sold all of its ownership interests in Bryan Mills Iradesso Corporation (“Bryan Mills”) to the noncontrolling shareholders, resulting in a write off of goodwill of $764. See Note 4 for further information on the dispositions.

Business Combinations. Business combinations are accounted for using the acquisition method and accordingly, the assets acquired (including identified intangible assets), the liabilities assumed and any noncontrolling interest in the acquired business

9

are recorded at their acquisition date fair values. The Company’s acquisition model typically provides for an initial payment at closing and for future additional contingent purchase price obligations. Contingent purchase price obligations are recorded as deferred acquisition consideration on the balance sheet at the acquisition date fair value and are remeasured at each reporting period. Changes in such estimated values are recorded in the results of operations. For further information see Notes 4 and 9. For the three and nine months ended September 30, 2017 and 2016, $2,462 of income and $12,152 of expense, respectively, and $11,152 and $17,180 of expense, respectively, related to changes in such estimated values and was recorded in results of operations. The Company expenses acquisition related costs as incurred. For the three and nine months ended September 30, 2017 and 2016, $216 and $693 respectively, and $806 and $2,266, respectively, of acquisition related costs were charged to operations.

For each acquisition, the Company undertakes a detailed review to identify intangible assets and a valuation is performed for all such identified assets. The Company uses several market participant measurements to determine the estimated value. This approach includes consideration of similar and recent transactions, as well as utilizing discounted expected cash flow methodologies. Like most service businesses, a substantial portion of the intangible asset value that the Company acquires is the specialized know-how of the workforce, which is treated as part of goodwill and is not required to be valued separately. The majority of the value of the identifiable intangible assets acquired is derived from customer relationships, including the related customer contracts, as well as trade names. In executing the Company’s overall acquisition strategy, one of the primary drivers in identifying and executing a specific transaction is the existence of, or the ability to expand the existing, client relationships. The expected benefits of the Company’s acquisitions are typically shared across multiple agencies and regions.

Redeemable Noncontrolling Interests. Many of the Company’s acquisitions include contractual arrangements where the noncontrolling shareholders have an option to purchase, or may require the Company to purchase, such noncontrolling shareholders’ incremental ownership interests under certain circumstances and the Company has similar call options under the same contractual terms. The amount of consideration under these contractual arrangements is not a fixed amount, but rather is dependent upon various valuation formulas as described in Note 12. In the event that an incremental purchase may be required of the Company, the amounts are recorded as redeemable noncontrolling interests in mezzanine equity on the balance sheet at their acquisition date fair value and adjusted for changes to their estimated redemption value through additional paid-in capital (but not less than their initial redemption value), except for foreign currency translation adjustments. These adjustments will not impact the calculation of earnings (loss) per share if the redemption values are less than the estimated fair values.

For the three and nine months ended September 30, 2017 and 2016, there was no related impact on the Company’s earnings (loss) per share calculation.  Changes in the estimated redemption amounts of the redeemable noncontrolling interests are adjusted at each reporting period with a corresponding adjustment to equity. These adjustments will not impact the calculation of earnings (loss) per share.

The following table presents changes in redeemable noncontrolling interests:

	Nine Months Ended September 30, 2017			Year Ended December 31, 2016
Beginning Balance	$	60,180		$	69,471
Redemptions	(816		)	(1,708		)
Additions (1)	—			2,274
Changes in redemption value	299			(9,604		)
Currency translation adjustments	429			(253		)
Ending Balance	$	60,092		$	60,180

(1) Additions consist of transfers from noncontrolling interests related to step-up transactions and new acquisitions.

Subsidiary and Equity Investment Stock Transactions. Transactions involving the purchase, sale or issuance of stock of a subsidiary where control is maintained are recorded as a reduction in the redeemable noncontrolling interests or noncontrolling interests, as applicable. Any difference between the purchase price and noncontrolling interest are recorded to additional paid-in capital. In circumstances where the purchase of shares of an equity investment results in obtaining control, the existing carrying value of the investment is remeasured to the acquisition date fair value and any gain or loss is recognized in results of operations.

Variable Interest Entity. Effective March 28, 2012, the Company invested in Doner Partners LLC (“Doner”). The Company acquired a 30% voting interest and convertible preferred interests that allow the Company to increase ordinary voting ownership to 70% at the Company’s option. Effective April 1, 2017, the Company acquired an additional 15% voting and convertible preferred interest that allowed the Company to increase ordinary voting ownership to 85% at the Company’s option. The Company now has a 45% voting interest. The Company has determined that (i) this entity is a variable interest entity, and (ii) the Company is the primary beneficiary because it receives a disproportionate share of profits and losses as compared to its ownership percentage. As such, Doner is consolidated for all periods subsequent to the date of investment.

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Doner is a full service integrated creative agency that is included as part of the Company’s portfolio in the Global Integrated Agencies segment. The Company’s Credit Agreement (see Note 6) is guaranteed and secured by all of Doner’s assets.

Total assets and total liabilities of Doner included in the Company’s consolidated balance sheet at September 30, 2017 were $100,229 and $53,508, respectively, and at December 31, 2016 were $102,456 and $57,622, respectively.

Guarantees.  Guarantees issued or modified by the Company to third parties after January 1, 2003 are generally recognized at the inception or modification of the guarantee as a liability for the obligations it has undertaken in issuing the guarantee, including its ongoing obligation to stand ready to perform over the term of the guarantee in the event that the specified triggering events or conditions occur. The initial measurement of that liability is the fair value of the guarantee. The recognition of a liability is required even if it is not probable that payments will be required under a guarantee. The Company’s liability associated with guarantees is not significant. See Note 12.

Revenue Recognition. The Company’s revenue recognition policies are established in accordance with the Revenue Recognition topics of the FASB ASC, and accordingly, revenue is recognized when all of the following criteria are satisfied: (i) persuasive evidence of an arrangement exists; (ii) the selling price is fixed or determinable; (iii) services have been performed or upon delivery of the products when ownership and risk of loss has transferred to the client; and (iv) collection of the resulting receivable is reasonably assured.

The Company follows the Multiple-Element Arrangement topic of the FASB ASC, which addresses certain aspects of the accounting by a vendor for arrangements under which it will perform multiple revenue-generating activities and how to determine whether an arrangement involving multiple deliverables contains more than one unit of accounting.

The Company follows the Principal Agent Consideration topic of the FASB ASC which addresses (i) whether revenue should be recorded at the gross amount billed because it has earned revenue from the sale of goods or services, or recorded at the net amount retained because it has earned a fee or commission, and (ii) that reimbursements received for out-of-pocket expenses incurred should be characterized in the income statement as revenue. Accordingly, the Company has included such reimbursed expenses in revenue.

The Company earns revenue from agency arrangements in the form of retainer fees or commissions; from short-term project arrangements in the form of fixed fees or per diem fees for services; and from incentives or bonuses.

Non-refundable retainer fees are generally recognized on a straight-line basis over the term of the specific customer arrangement. Commission revenue is earned and recognized upon the placement of advertisements in various media when the Company has no further performance obligations. Fixed fees for services are recognized upon completion of the earnings process and acceptance by the client. Per diem fees are recognized upon the performance of the Company’s services. In addition, for a limited number of certain service transactions, which require delivery of a number of service acts, the Company uses the proportional performance model, which generally results in revenue being recognized based on the straight-line method.

For arrangements with customers for which the Company earns a fixed fee for development of customized mobile applications (“Apps”), revenue is recognized in accordance with the accounting guidance contained in ASC 605-35 and is primarily recognized using the proportional performance method of accounting. Performance is generally measured based upon the efforts incurred to date in relation to total estimated efforts to the completion of the contract.

Fees billed to clients in excess of fees recognized as revenue are classified as advanced billings on the Company’s balance sheet.

A small portion of the Company’s contractual arrangements with customers includes performance incentive provisions, which allow the Company to earn additional revenue as a result of its performance relative to both quantitative and qualitative goals. The Company recognizes the incentive portion of revenue under these arrangements when specific quantitative goals are assured, or when the Company’s clients determine performance against qualitative goals has been achieved. In all circumstances, revenue is only recognized when collection is reasonably assured. The Company records revenue net of sales and other taxes due to be collected and remitted to governmental authorities.

Cost of Services Sold.  Cost of services sold do not include depreciation charges for fixed assets.

Interest Expense. Interest expense primarily consists of the cost of borrowing on the Company’s previously outstanding 6.75% Senior Notes due 2020 (the “6.75% Notes”); the Company’s currently outstanding 6.50% senior unsecured notes due 2024 (the “6.50% Notes”); and the Company’s $325 million senior secured revolving credit agreement due 2021 (the “Credit Agreement”). The Company uses the effective interest method to amortize the deferred financing costs on the 6.75% Notes and the 6.50% Notes as well as the original issue premium on the previously outstanding 6.75% Notes. The Company also uses the straight-line method to amortize the deferred financing costs on the Credit Agreement. For the three and nine months ended September 30, 2017 and 2016, interest expense included $24 and $77, respectively, and $30 and $181, respectively, relating to present value adjustments for fixed deferred acquisition consideration payments.

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The Company redeemed the 6.75% Notes with the net proceeds from the issuance of the 6.50% Notes. For further information see Note 6.

Income Taxes. The Company’s U.S. operating units are generally structured as limited liability companies, which are treated as partnerships for tax purposes. The Company is only taxed on its share of the profits, while noncontrolling holders are responsible for taxes on their share of the profits. Deferred income taxes reflect the tax effects of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes, as well as the tax effect of carryforwards. The Company currently has a fully reserved valuation allowance on its deferred tax assets related to U.S. net operating losses. Realization of our deferred tax assets is evaluated on a quarterly basis and is based upon all available evidence. It is possible that sufficient positive evidence to support the realization of the Company’s net deferred tax assets will exist in the near future, and the previously provided valuation allowance could be reversed in whole or in part.

During the nine months ended September 30, 2017 and 2016, the Company’s effective tax rate was impacted by losses in certain tax jurisdictions where a valuation allowance was deemed necessary.

During the second quarter of 2017, the Company identified and recorded out-of-period adjustments related to the misapplication of ASC 740 and ASC 850-740 accounting policies as they applied to the calculation of deferred tax liabilities.  The corrections have resulted in a $6,916 increase to the Company’s deferred tax liability on the condensed consolidated balance sheet as of December 31, 2016. The Company has performed a qualitative and quantitative analysis of this misapplication and determined it not to be material to prior periods. The Company has revised prior period information presented on this Form 10-Q as follows: (i) for the three and nine months ended September 30, 2016, income tax expense has been decreased by $1,390 and decreased by $713, respectively, (ii) basic and diluted net loss attributable to MDC Partners Inc. common shareholders for the nine months ended September 30, 2016 increased by $0.01 per share, and (iii) deferred tax liabilities and accumulated deficit increased by $6,916 as of December 31, 2016. The correction had no impact on the Company’s cash flows.

Stock-Based Compensation.  Under the fair value method, compensation cost is measured at fair value at the date of grant and is expensed over the service period, in this case the award’s vesting period. The Company recognizes forfeitures as they occur. When awards are exercised, share capital is credited by the sum of the consideration paid, together with the related portion previously credited to additional paid-in capital when compensation costs were charged against income or acquisition consideration.

The Company uses its historical volatility derived over the expected term of the award to determine the volatility factor used in determining the fair value of the award.

Stock-based awards that are settled in cash, or may be settled in cash at the option of employees, are recorded as liabilities. The measurement of the liability and compensation cost for these awards is based on the fair value of the award, and is recorded in operating income over the service period, in this case the award’s vesting period. Changes in the Company’s payment obligation prior to the settlement date of a stock-based award are recorded as compensation cost in operating income in the period of the change. The final payment amount for such awards is established on the date of the exercise of the award by the employee.

Stock-based awards that are settled in cash or equity at the option of the Company are recorded at fair value on the date of grant and recorded as additional paid-in capital. The fair value measurement of the compensation cost for these awards is based on using the Black-Scholes option pricing-model and is recorded in operating income over the service period, in this case the award’s vesting period.

It is the Company’s policy for issuing shares upon the exercise and/or vesting of an equity incentive award to verify the amount of shares to be issued, as well as the amount of proceeds to be collected (if any) and to deliver new shares to the exercising party.

The Company has adopted the straight-line attribution method for determining the compensation cost to be recorded during each accounting period. The Company commences recording compensation expense related to awards that are based on performance conditions under the straight-line attribution method when it is probable that such performance conditions will be met.

The Company treats benefits paid by shareholders or equity members to employees as a stock-based compensation charge with a corresponding credit to additional paid-in-capital.

From time to time, certain acquisitions and step-up transactions include an element of compensation related payments. The Company accounts for those payments as stock-based compensation.

In January 2017, the Company issued 327,500 Stock Appreciation Rights (“SARS”) to its employees. The SARS have an exercise price of $6.60 and will vest on the three year anniversary of the grant date. The Company will be recording a stock-based compensation charge of $770 from the date of the grant through 2020 for these SARS awards.

During the nine months ended September 30, 2017, the Company issued 243,000 shares of restricted stock and restricted stock units (collectively, “RSUs”) to its employees and directors. The RSUs have an aggregate grant date fair value of $1,966 and generally vest on the third anniversary of the date of grant. In addition, during the first quarter of 2017, the Company issued RSUs of which 930,600 awarded shares were outstanding as of September 30, 2017. However, the vesting of these awards is

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contingent upon the Company meeting a cumulative three year financial performance target and continued employment through the March 1, 2020 vesting date. These RSU awards do not yet have an established grant date fair value because the financial performance target is not yet established. Once the Company defines the financial performance target, and assuming the achievement of such performance targets is expected, the grant date is established and the Company will record the compensation expense over the vesting period. Additionally, the Company still has outstanding RSUs of 513,321 which are also based on a cumulative financial performance target and will vest on March 1, 2019.

Income (Loss) per Common Share.  Basic income (loss) per common share is based upon the weighted average number of common shares outstanding during each period. Share capital to be issued, as reflected in shareholders’ deficit on the balance sheet, are also included if there is no circumstance under which those shares would not be issued. Diluted income (loss) per common share is based on the above, in addition, if dilutive, it also includes common share equivalents, which include outstanding options, stock appreciation rights, and unvested restricted stock units. In periods of net loss, all potentially issuable common shares are excluded from diluted net loss per common share because they are anti-dilutive.

During the first quarter of 2017, the Company issued and sold 95,000 newly authorized Series 4 Convertible Preference Shares (the “Preference Shares”) in a private placement. The two-class method is applied to calculate basic net income (loss) attributable to MDC Partners, Inc. per common share in periods in which shares of convertible preference shares were outstanding, as shares of convertible preference shares are participating securities due to their dividend rights. See Notes 7 and 8. The two-class method is an earnings allocation method under which earnings per share is calculated for common stock considering a participating security’s rights to undistributed earnings as if all such earnings had been distributed during the period. Either the two-class method or the if-converted method is applied to calculate diluted net income per common share, depending on which method results in more dilution. The Company’s participating securities are not included in the computation of net loss per common share in periods of net loss because the convertible preference shareholders have no contractual obligation to participate in losses.

Foreign Currency Translation.  The Company’s financial statements were prepared in accordance with the requirements of FASB ASC Topic 830, Foreign Currency Matters. The functional currency of the Company is the Canadian dollar and it has decided to use U.S. dollars as its reporting currency for consolidated reporting purposes. Generally, the Company’s subsidiaries use their local currency as their functional currency. Accordingly, the currency impacts of the translation of the balance sheets of the Company’s non-U.S. dollar based subsidiaries to U.S. dollar statements are included as cumulative translation adjustments in accumulated other comprehensive income. Translation of intercompany debt, which is not intended to be repaid, is included in cumulative translation adjustments. Cumulative translation adjustments are not included in net earnings unless they are actually realized through a sale or upon complete or substantially complete liquidation of the Company’s net investment in the foreign operation. Translation of current intercompany balances are included in net earnings. The balance sheets of non-U.S. dollar based subsidiaries are translated at the period end rate. The income statements of non-U.S. dollar based subsidiaries are translated at average exchange rates for the period.

Gains and losses arising from the Company’s foreign currency transactions are reflected in net earnings. Unrealized gains or losses arising on the translation of certain intercompany foreign currency transactions that are of a long-term nature (that is settlement is not planned or anticipated in the future) are included as cumulative translation adjustments in accumulated other comprehensive loss.

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3. Income (Loss) Per Common Share

The following table sets forth the computation of basic and diluted income (loss) per common share:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
	2017			2016			2017			2016
Numerator
Net income (loss) attributable to MDC Partners Inc.	$	18,493		$	(32,140	)	$	19,180		$	(54,937	)
Accretion on convertible preference shares	(1,948		)	—			(4,365		)	—
Net income allocated to convertible preference shares	(2,408		)	—			(1,782		)	—
Numerator for basic loss per common share - Net income (loss) attributable to MDC Partners Inc. common shareholders	14,137			(32,140		)	13,033			(54,937		)
Effect of dilutive securities:
Adjustment to net income allocated to convertible preference shares	13			—			9			—
Numerator for diluted income (loss) per common share- Net income (loss) attributable to MDC Partners Inc. common shareholders	$	14,150		$	(32,140	)	$	13,042		$	(54,937	)
Denominator
Denominator for basic income (loss) per common share - weighted average common shares	57,566,707			52,244,819			53,915,536			50,861,890
Effect of dilutive securities:
Impact of stock options and non-vested stock under employee stock incentive plans	376,373			—			312,672			—
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions	57,943,080			52,244,819			54,228,208			50,861,890
Basic income (loss) per common share	$	0.25		$	(0.62	)	$	0.24		$	(1.08	)
Diluted income (loss) per common share	$	0.24		$	(0.62	)	$	0.24		$	(1.08	)

As of September 30, 2017, options and other rights to purchase 1,118,085 shares of common stock were outstanding, of which 741,712 and 805,413 shares of non-vested restricted stock and restricted stock units were anti-dilutive during the three and nine months ended September 30, 2017, respectively, and therefore excluded from the computation of diluted income per common share. Additionally, 1,443,921 shares of non-vested restricted stock and restricted stock unit awards, which are contingent upon the Company meeting an undefined cumulative three year earnings target and continued employment, are excluded from the computation of diluted income per common share as the contingency has not been satisfied at September 30, 2017. Lastly, there were 95,000 shares of Preference Shares outstanding which were convertible into 9,936,514 Class A common shares at September 30, 2017. These Preference Shares were anti-dilutive for the three and nine months ended September 30, 2017, and are therefore excluded from the diluted loss per common share calculation for the period.

As of September 30, 2016, options and other rights to purchase 918,260 shares of common stock were outstanding, of which 880,760 shares of non-vested restricted stock and restricted stock units were anti-dilutive during the three and nine months ended September 30, 2016 and therefore excluded from the computation of diluted income per common share. Additionally, 523,321 shares of non-vested restricted stock and restricted stock unit awards, which are contingent upon the Company meeting an undefined cumulative three year earnings target and continued employment, are excluded from the computation of diluted income per common share as the contingency had not been satisfied as of September 30, 2016.

,4. Acquisitions and Dispositions

Valuations of acquired companies are based on a number of factors, including specialized know-how, reputation, competitive position and service offerings. The Company’s acquisition strategy has been focused on acquiring the expertise of an assembled workforce in order to continue to build upon the core capabilities of its various strategic business platforms to better serve the Company’s clients. The Company’s strategy includes acquiring ownership stakes in well-managed businesses with strong reputations in the industry. The Company’s model of “Perpetual Partnership” often involves acquiring a majority interest rather than a 100% interest and leaving management owners with a significant financial interest in the performance of the acquired entity for a minimum period of time, typically not less than five years. The Company’s acquisition model in this scenario typically provides for (i) an initial payment at the time of closing, (ii) additional contingent purchase price obligations based on the future performance of the acquired entity, and (iii) an option by the Company to purchase (and in some instances a requirement to so purchase) the remaining interest of the acquired entity under a predetermined formula.

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Contingent purchase price obligations. The Company’s contingent purchase price obligations are generally payable within a five year period following the acquisition date, and are based on (i) the achievement of specific thresholds of future earnings, and (ii) in certain cases, the growth rate of those earnings. Contingent purchase price obligations are recorded as deferred acquisition consideration on the balance sheet at the acquisition date fair value and adjusted at each reporting period through operating income or net interest expense, depending on the nature of the arrangement. On occasion, the Company may initiate a renegotiation of previously acquired ownership interests and any resulting change in the estimated amount of consideration to be paid is adjusted in the reporting period through operating income or net interest expense, depending on the nature of the arrangement. See Notes 2, 9, and 12 for additional information on the deferred acquisition consideration.

Options to purchase. When acquiring less than 100% ownership, the Company may enter into agreements that give the Company an option to purchase, or require the Company to purchase, the incremental ownership interests under certain circumstances. Where the option to purchase the incremental ownership is within the Company’s control, the amounts are recorded as noncontrolling interests in the equity section of the Company’s balance sheet. Where the incremental purchase may be required of the Company, the amounts are recorded as redeemable noncontrolling interests in mezzanine equity at their estimated acquisition date redemption value and adjusted at each reporting period for changes to their estimated redemption value through additional paid-in capital (but not less than their initial redemption value), except for foreign currency translation adjustments. On occasion, the Company may initiate a renegotiation to acquire an incremental ownership interest and the amount of consideration paid may differ materially from the balance sheet amounts. See Note 12 for additional information on redeemable noncontrolling interests.

Employment conditions. From time to time, specifically when the projected success of an acquisition is deemed to be dependent on retention of specific personnel, such acquisition may include deferred payments that are contingent upon employment terms as well as financial performance. The Company accounts for those payments through operating income as stock-based compensation over the required retention period. For the three and nine months ended September 30, 2017 and 2016, stock-based compensation included $4,064 and $9,792, respectively, and $2,259 and $7,184, respectively, of expense relating to those payments.

Distributions to noncontrolling shareholders. If noncontrolling shareholders have the right to receive distributions based on the profitability of an acquired entity, the amount is recorded as income attributable to noncontrolling interests.  However, there are circumstances when the Company acquires a majority interest and the selling shareholders waive their right to receive distributions with respect to their retained interest for a period of time, typically not less than five years.  Under this model, the right to receive such distributions typically begins concurrently with the purchase option period and, therefore, if such option is exercised at the first available date, the Company may not record any noncontrolling interest over the entire period from the initial acquisition date through the acquisition date of the remaining interests.

2017 Acquisitions

In 2017, the Company entered into various non-material transactions in connection with certain of its majority-owned entities. As a result of the foregoing, the Company made total cash closing payments of $3,858, increased fixed deferred consideration liability by $7,208, reduced redeemable noncontrolling interests by $816, reduced noncontrolling interests equity by $11,965, reduced noncontrolling interest payable by $397, and increased additional paid-in capital by $2,316. In addition, a stock-based compensation charge of $996 has been recognized representing the consideration paid in excess of the fair value of the interest acquired.

2017 Dispositions

During the three months ended September 30, 2017, the Company sold all of its ownership interests in three subsidiaries resulting in recognition of a net loss on sale of business of $1,424. The net assets reflected in the calculation of the net loss on sale was inclusive of goodwill of $17,593. Goodwill was allocated to the subsidiaries based on the relative fair value of the sold subsidiaries compared to the fair value of the respective reporting units. See Note 1 for details. Additionally, the Company recorded a reduction in noncontrolling interests of $10,657.

2016 Acquisitions

Effective July 1, 2016, the Company acquired 100% of the equity interests of Forsman & Bodenfors AB (“F&B”), an advertising agency based in Sweden, for an estimated aggregate purchase price at acquisition date of $49,837, consisting of a closing payment of 1,900,000 MDC Class A subordinate voting shares with an acquisition date fair value of $34,219, plus additional deferred acquisition payments with an estimated present value at acquisition date of $15,618. The amount of additional payments are based on the financial results of the acquired business for 2015 and 2016 as well as for the value of the Company’s shares from July 1, 2016 up to and including the close of business on November 2, 2016. During the three months ended June 30, 2017, the Company paid cash of $3,055 and issued an additional 2,450,000 MDC Class A subordinate voting shares with a fair value of $20,800 as a settlement of deferred acquisition consideration.

An allocation of excess purchase price consideration of this acquisition to the fair value of the net assets acquired resulted in identifiable intangibles of $36,698, consisting primarily of customer lists, trade names and covenants not to compete, and goodwill

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of $24,778, including the value of the assembled workforce. The identified assets have a weighted average useful life of approximately 10.8 years and will be amortized in a manner represented by the pattern in which the economic benefits of such assets are expected to be realized. In addition, the Company has recorded $2,275 as the present value of redeemable noncontrolling interests and $5,514 as the present value of noncontrolling interests both relating to the noncontrolling interest of F&B’s subsidiaries. None of the intangibles and goodwill are tax deductible and the Company recorded a deferred tax liability of $8,074 related to the intangibles. F&B’s results are included in the Global Integrated Agencies segment.

During the six months ended June 30, 2017, F&B earned revenue of $43,535 and incurred a net loss of $4,460, which is included in our consolidated results for the nine months ended September 30, 2017. The net loss was attributable to an increase in the deferred acquisition payment liability related to such acquisition, driven by the decrease in t    he future market performance of the Company’s stock price and the amortization of the intangibles identified in the allocation of the purchase price consideration.

Effective April 1, 2016, the Company acquired the remaining 40% ownership interests of Luntz Global Partners LLC. In 2016, the Company also entered into various non-material transactions in connection with other majority-owned entities. As a result of the foregoing, the Company made total cash closing payments of $1,581, eliminated the contingent deferred acquisition payments of $4,052 and fixed deferred acquisition payments of $467 related to certain initial acquisition of the equity interests, reduced other assets by $428, reduced redeemable noncontrolling interests by $1,005, reduced noncontrolling interests by $19,354, increased accruals and other liabilities by $94, and increased additional paid-in capital by $22,775. Additional deferred payments with an estimated present value at acquisition date of $2,393 that are contingent upon service conditions have been excluded from deferred acquisition consideration and will be expensed as stock-based compensation over the required service period.

2016 Dispositions

Effective September 30, 2016, the Company sold all of its ownership interests in Bryan Mills to the noncontrolling shareholders and recognized a loss of $800. The net assets reflected in the calculation of the loss on sale was inclusive of goodwill of $764.

Noncontrolling Interests

Changes in the Company’s ownership interests in its less than 100% owned subsidiaries during the three and nine months ended September 30, 2017 and 2016 were as follows:

Net Income (Loss) Attributable to MDC Partners Inc. and

Transfers (to) from the Noncontrolling Interests

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017		2016
Net income (loss) attributable to MDC Partners Inc.	$	18,493		$	(32,140	)	$	19,180	$	(54,937	)
Transfers from the noncontrolling interest:
(Decrease) increase in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of Redeemable Noncontrolling Interests and Noncontrolling Interests	(337		)	(520		)	2,315		22,498
Net transfers from noncontrolling interests	$	(337	)	$	(520	)	$	2,315	$	22,498
Change from net income (loss) attributable to MDC Partners Inc. and transfers to noncontrolling interests	$	18,156		$	(32,660	)	$	21,495	$	(32,439	)

5. Accounts Payable, Accruals and Other Liabilities

At September 30, 2017 and December 31, 2016, accruals and other liabilities included accrued media of $169,460 and $201,872, respectively; and included amounts due to noncontrolling interest holders for their share of profits, which will be distributed within the next twelve months of $5,802 and $4,154, respectively.

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Changes in amounts due to noncontrolling interest holders included in accrued and other liabilities for the year ended December 31, 2016 and nine months ended September 30, 2017 were as follows:

	Noncontrolling Interests
Balance, December 31, 2015	$	5,473
Income attributable to noncontrolling interests	5,218
Distributions made	(7,772		)
Other (1)	1,235
Balance, December 31, 2016	$	4,154
Income attributable to noncontrolling interests	6,588
Distributions made	(5,272		)
Other (1)	332
Balance, September 30, 2017	$	5,802

(1) Other consists primarily of business acquisitions, sale of a business, step-up transactions, and cumulative translation adjustments.

At September 30, 2017 and December 31, 2016, accounts payable included $47,430 and $80,193 of outstanding checks, respectively.

6. Debt

The Company’s indebtedness was comprised as follows:

	September 30, 2017			December 31, 2016
Revolving credit agreement	$	48,607		$	54,425
6.50% Notes due 2024	900,000			900,000
Debt issuance costs	(18,161		)	(18,420		)
	930,446			936,005
Obligations under capital leases	743			431
	931,189			936,436
Less: Current portion of long-term debt	300			228
	$	930,889		$	936,208

6.50% Notes

On March 23, 2016, MDC entered into an indenture (the “Indenture”) among MDC, its existing and future restricted subsidiaries that guarantee, are co-borrowers under, or grant liens to secure, the Credit Agreement, as guarantors (the “Guarantors”) and The Bank of New York Mellon, as trustee, relating to the issuance by MDC of $900,000 aggregate principal amount of the 6.50% Notes. The 6.50% Notes were sold in a private placement in reliance on exceptions from registration under the Securities Act of 1933. The 6.50% Notes bear interest at a rate of 6.50% per annum, accruing from March 23, 2016. Interest is payable semiannually in arrears on May 1 and November 1 of each year, beginning November 1, 2016. The 6.50% Notes mature on May 1, 2024, unless earlier redeemed or repurchased. The Company received net proceeds from the offering of the 6.50% Notes equal to approximately $880,000. The Company used the net proceeds to redeem all of its existing 6.75% Notes, together with accrued interest, related premiums, fees and expenses and recorded a charge for the loss on redemption of such notes of $33,298, including write offs of unamortized original issue premium and debt issuance costs. Remaining proceeds were used for general corporate purposes, including funding of deferred acquisition consideration.

The 6.50% Notes are guaranteed on a senior unsecured basis by all of MDC’s existing and future restricted subsidiaries that guarantee, or are co-borrowers under or grant liens to secure, the Credit Agreement. The 6.50% Notes are unsecured and unsubordinated obligations of MDC and rank (i) equally in right of payment with all of MDC’s or any Guarantor’s existing and future senior indebtedness, (ii) senior in right of payment to MDC’s or any Guarantor’s existing and future subordinated indebtedness, (iii) effectively subordinated to all of MDC’s or any Guarantor’s existing and future secured indebtedness to the extent of the collateral securing such indebtedness, including the Credit Agreement, and (iv) structurally subordinated to all existing and future liabilities of MDC’s subsidiaries that are not Guarantors.

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MDC may, at its option, redeem the 6.50% Notes in whole at any time or in part from time to time, on and after May 1, 2019 (i) at a redemption price of 104.875% of the principal amount thereof if redeemed during the twelve-month period beginning on May 1, 2019, (ii) at a redemption price of 103.250% of the principal amount thereof if redeemed during the twelve-month period beginning on May 1, 2020, (iii) at a redemption price of 101.625% of the principal amount thereof if redeemed during the twelve-month period beginning on May 1, 2021, and (iv) at a redemption price of 100% of the principal amount thereof if redeemed on May 1, 2022 and thereafter.

Prior to May 1, 2019, MDC may, at its option, redeem some or all of the 6.50% Notes at a price equal to 100% of the principal amount of the 6.50% Notes plus a “make whole” premium and accrued and unpaid interest. MDC may also redeem, at its option, prior to May 1, 2019, up to 35% of the 6.50% Notes with the proceeds from one or more equity offerings at a redemption price of 106.50% of the principal amount thereof.

If MDC experiences certain kinds of changes of control (as defined in the Indenture), holders of the 6.50% Notes may require MDC to repurchase any 6.50% Notes held by them at a price equal to 101% of the principal amount of the 6.50% Notes plus accrued and unpaid interest. In addition, if MDC sells assets under certain circumstances, it must apply the proceeds from such sale and offer to repurchase the 6.50% Notes at a price equal to 100% of the principal amount plus accrued and unpaid interest.

The Indenture includes covenants that, among other things, restrict MDC’s ability and the ability of its restricted subsidiaries (as defined in the Indenture) to incur or guarantee additional indebtedness; pay dividends on or redeem or repurchase the capital stock of MDC; make certain types of investments; create restrictions on the payment of dividends or other amounts from MDC’s restricted subsidiaries; sell assets; enter into transactions with affiliates; create liens; enter into sale and leaseback transactions; and consolidate or merge with or into, or sell substantially all of MDC’s assets to, another person. These covenants are subject to a number of important limitations and exceptions. The 6.50% Notes are also subject to customary events of default, including a cross-payment default and cross-acceleration provision.

Redemption of 6.75% Notes

On March 23, 2016, the Company redeemed the 6.75% Notes in whole at a redemption price of 103.375% of the principal amount thereof with the proceeds from the issuance of the 6.50% Notes.

Credit Agreement

On March 20, 2013, MDC, Maxxcom Inc. (a subsidiary of MDC) and each of their subsidiaries party thereto entered into an amended and restated, $225,000 senior secured revolving credit agreement due 2018 (the “Credit Agreement”) with Wells Fargo Capital Finance, LLC, as agent, and the lenders from time to time party thereto. Advances under the Credit Agreement are to be used for working capital and general corporate purposes, in each case pursuant to the terms of the Credit Agreement. Capitalized terms used in this section and not otherwise defined have the meanings set forth in the Credit Agreement.

Effective October 23, 2014, MDC and its subsidiaries entered into an amendment to its Credit Agreement. The amendment: (i) expanded the commitments under the facility by $100,000, from $225,000 to $325,000; (ii) extended the date by an additional eighteen months to September 30, 2019; (iii) reduced the base borrowing interest rate by 25 basis points (the applicable margin for borrowing is 1.00% in the case of Base Rate Loans and 1.75% in the case of LIBOR Rate Loans); and (iv) modified certain covenants to provide the Company with increased flexibility to fund its continued growth and other general corporate purposes.

Effective May 3, 2016, MDC and its subsidiaries entered into an additional amendment to its Credit Agreement. The amendment: (i) extends the date by an additional nineteen months to May 3, 2021; (ii) reduces the base borrowing interest rate by 25 basis points; (iii) provides the Company the ability to borrow in foreign currencies; and (iv) certain other modifications to provide additional flexibility in operating the Company’s business.

Advances under the Credit Agreement bear interest as follows: (a)(i) LIBOR Rate Loans bear interest at the LIBOR Rate and (ii) Base Rate Loans bear interest at the Base Rate, plus (b) an applicable margin. The initial applicable margin for borrowing is 1.50% in the case of Base Rate Loans and 1.75% in the case of LIBOR Rate Loans. In addition to paying interest on outstanding principal under the Credit Agreement, MDC is required to pay an unused revolver fee to lenders under the Credit Agreement in respect of unused commitments thereunder.

The Credit Agreement is guaranteed by substantially all of MDC’s present and future subsidiaries, other than immaterial subsidiaries and subject to customary exceptions. The Credit Agreement includes covenants that, among other things, restrict MDC’s ability and the ability of its subsidiaries to incur or guarantee additional indebtedness; pay dividends on or redeem or repurchase the capital stock of MDC; make certain types of investments; impose limitations on dividends or other amounts from MDC’s subsidiaries; incur certain liens, sell or otherwise dispose of certain assets; enter into transactions with affiliates; enter into sale and leaseback transactions; and consolidate or merge with or into, or sell substantially all of MDC’s assets to, another person. These covenants are subject to a number of important limitations and exceptions. The Credit Agreement also contains financial covenants, including a total leverage ratio, a senior leverage ratio, a fixed charge coverage ratio and a minimum earnings level (each as more fully described in the Credit Agreement). The Credit Agreement is also subject to customary events of default.

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The Company is currently in compliance with all of the terms and conditions of its Credit Agreement, and management believes, based on its current financial projections, that the Company will be in compliance with the covenants over the next twelve months. At September 30, 2017, there were $48,607 borrowings under the Credit Agreement.

At September 30, 2017, the Company had issued $5,009 of undrawn outstanding letters of credit.

7. Share Capital

The Company’s issued and outstanding share capital is as follows:

Series 4 Convertible Preference Shares

A total of 95,000, non-voting convertible preference shares, all of which were issued and outstanding as of September 30, 2017. See Note 8 for details. There were no such shares issued and outstanding as of December 31, 2016.

Class A Common Shares (“Class A Shares”)

An unlimited number of subordinate voting shares, carrying one vote each, entitled to dividends equal to or greater than Class B Shares, convertible at the option of the holder into one Class B Share for each Class A Share after the occurrence of certain events related to an offer to purchase all Class B shares. There were 56,310,589 and 52,798,303 Class A Shares issued and outstanding as of September 30, 2017 and December 31, 2016, respectively.

Class B Common Shares (“Class B Shares”)

An unlimited number of voting shares, carrying 20 votes each, convertible at any time at the option of the holder into one Class A share for each Class B share. There were 3,755 Class B Shares issued and outstanding as of September 30, 2017 and December 31, 2016.

8. Convertible Preference Shares

On March 7, 2017 (the “Issue Date”), the Company issued 95,000 newly created Preference Shares to affiliates of The Goldman Sachs Group, Inc. (collectively, the “Purchaser”) pursuant to a $95,000 private placement. The Company received proceeds of approximately $90,220, net of fees and estimated expenses, which were primarily used to pay down existing debt under the Company’s credit facility and for general corporate purposes. In connection with the closing of the transaction, effective March 7, 2017, the Company increased the size of its Board of Directors (the “Board”) to seven members and appointed one nominee designated by the Purchaser. Except as required by law, the Preference Shares do not have voting rights, and are not redeemable at the option of the Purchaser.

The holders of the Preference Shares have the right to convert their Preference Shares in whole at any time and from time to time, and in part at any time and from time to time after the ninetieth day following the original issuance date of the Preference Shares, into a number of Class A Shares equal to the then-applicable liquidation preference divided by the applicable conversion price at such time (the “Conversion Price”). The initial liquidation per share preference of each Preference Share is $1,000. The initial Conversion Price will be $10.00 per Preference Share, subject to customary adjustments for share splits and combinations, dividends, recapitalizations and other matters, including weighted average anti-dilution protection for certain issuances of equity or equity-linked securities.

The Preference Shares’ liquidation preference accretes at 8.0% per annum, compounded quarterly until the five-year anniversary of the Issue Date. During the nine months ended September 30, 2017, the Preference Shares accreted at a monthly rate of approximately $6.84 per Preference Share, for total accretion of $4,365, bringing the aggregate liquidation preference to $99,365 as of September 30, 2017. The accretion is considered in the calculation of net income (loss) attributable to MDC Partners Inc. common shareholders. See Notes 2 and 3.

Holders of the Preference Shares are entitled to dividends in an amount equal to any dividends that would otherwise have been payable on the Class A Shares issued upon conversion of the Preference Shares. The Preference Shares are convertible at the Company’s option (i) on and after the two-year anniversary of the Issue Date, if the closing trading price of the Class A Shares over a specified period prior to conversion is at least 125% of the Conversion Price or (ii) after the fifth anniversary of the Issue Date, if the closing trading price of the Class A Shares over a specified period prior to conversion is at least equal to the Conversion Price.

Following certain change in control transactions of the Company in which holders of Preference Shares are not entitled to receive cash or qualifying listed securities with a value at least equal to the liquidation preference plus accrued and unpaid dividends, (i) holders will be entitled to cash dividends on the liquidation preference at an increasing rate (beginning at 7%), and (ii) the

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Company will have a right to redeem the Preference Shares for cash at the greater of their liquidation preference plus accrued and unpaid dividends or their as-converted value.

9. Fair Value Measurements

Authoritative guidance for fair value establishes a framework for measuring fair value. A fair value measurement assumes a transaction to sell an asset or transfer a liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability.

In order to increase consistency and comparability in fair value measurements, the guidance establishes a hierarchy for observable and unobservable inputs used to measure fair value into three broad levels, which are described below: 

• Level 1 - Quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities. The fair value hierarchy gives the highest priority to Level 1 inputs.

• Level 2 - Observable prices that are based on inputs not quoted on active markets, but corroborated by market data.

• Level 3 - Unobservable inputs are used when little or no market data is available. The fair value hierarchy gives the lowest priority to Level 3 inputs.

In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible as well as considers counterparty credit risk in its assessment of fair value.

Financial Liabilities Measured at Fair Value on a Recurring Basis

The following tables present certain information for the financial liabilities that are disclosed at fair value on a recurring basis at September 30, 2017 and December 31, 2016:

	Level 1				Level 1
	September 30, 2017				December 31, 2016
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Liabilities:
6.50% Notes due 2024	$	900,000	$	909,000	$	900,000	$	812,250

Long-term debt includes fixed rate debt. The fair value of this instrument is based on quoted market prices.

The following table presents changes in deferred acquisition consideration:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	September 30,			December 31,
	2017			2016
Beginning balance of contingent payments	$	224,754		$	306,734
Payments (1)	(73,358		)	(105,169		)
Additions (2)	—			16,132
Redemption value adjustments (3)	19,233			13,930
Other (4)	(27,118		)	(6,412		)
Foreign translation adjustment	1,336			(461		)
Ending balance of contingent payments	$	144,847		$	224,754

(1) For the nine months ended September 30, 2017 and the year ended December 31, 2016, payments include $28,727 and $10,458, respectively, of deferred acquisition consideration settled through the issuance of 3,353,939 and 691,559 MDC Class A subordinate voting shares, respectively, in lieu of cash.

(2) Additions are the initial estimated deferred acquisition payments of new acquisitions and step-up transactions completed within that fiscal period.

(3) Redemption value adjustments are fair value changes from the Company’s initial estimates of deferred acquisition payments, including the accretion of present value and stock-based compensation charges relating to acquisition payments that are tied to continued employment.

(4) For the year ended December 31, 2016, other is comprised of (i) $2,360 transferred to shares to be issued related to

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100,000 MDC Class A subordinate voting shares to be issued contingent on specific thresholds of future earnings that management expects to be attained; and (ii) $4,052 of contingent payments eliminated through the acquisition of incremental ownership interests, see Note 4.

In addition to the above amounts, there are fixed payments of $3,421 and $4,810 for total deferred acquisition consideration of $148,268 and $229,564, which reconciles to the consolidated balance sheets at September 30, 2017 and December 31, 2016, respectively.

The Company includes the payments of all deferred acquisition consideration in financing activities in the Company’s consolidated statement of cash flows as the Company believes these payments to be seller-related financing activities, which is the predominant source of cash flows. The FASB recently issued new guidance regarding the classification of cash flows for contingent consideration that is effective January 1, 2018. See Note 13 for further information.

Level 3 payments relate to payments made for deferred acquisition consideration. Level 3 grants relate to contingent purchase price obligations related to acquisitions and are recorded on the balance sheet at the acquisition date fair value. The estimated liability is determined in accordance with various contractual valuation formulas that may be dependent on future events, such as the growth rate of the earnings of the relevant subsidiary during the contractual period and, in some cases, the currency exchange rate as of the date of payment. Level 3 redemption value adjustments relate to the remeasurement and change in these various contractual valuation formulas as well as adjustments of present value.

At September 30, 2017 and December 31, 2016, the carrying amount of the Company’s financial instruments, including cash and cash equivalents, accounts receivable and accounts payable, approximated fair value because of their short-term maturity. Borrowings under the Credit Agreement approximate fair value due to the debt bearing fluctuating market interest rates. The Company does not disclose the fair value for equity method investments or investments held at cost as it is not practical to estimate fair value since there is no readily available market data.

Non-financial Assets and Liabilities that are Measured at Fair Value on a Non-recurring Basis

On a non-recurring basis, the Company uses fair value measures when analyzing asset impairment. Long-lived assets and certain identifiable intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If it is determined such indicators are present and the review indicates that the assets will not be fully recoverable, based on undiscounted estimated cash flows over the remaining amortization periods, their carrying values are reduced to estimated fair value. Measurements based on undiscounted cash flows are considered to be Level 3 inputs. During the fourth quarter of each year, the Company evaluates goodwill and indefinite-lived intangibles for impairment at the reporting unit level. For each acquisition, the Company performed a detailed review to identify intangible assets and a valuation is performed for all such identified assets. The Company used several market participant measurements to determine estimated value. This approach includes consideration of similar and recent transactions, as well as utilizing discounted expected cash flow methodologies. The amounts allocated to assets acquired and liabilities assumed in the acquisitions were determined using Level 3 inputs. Fair value for property and equipment was based on other observable transactions for similar property and equipment. Accounts receivable represents the best estimate of balances that will ultimately be collected, which is based in part on allowance for doubtful accounts reserve criteria and an evaluation of the specific receivable balances.

10. Other Income

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Other income (expense)	$	(7	)	$	26		$	271		$	(220	)
Loss on sale of business (1)	(1,424		)	(800		)	(1,424		)	(800		)
Gain on sale of investments (2)	168			682			168			682
Foreign currency transaction gain (loss)	9,912			(5,916		)	18,797			9,868
	$	8,649		$	(6,008	)	$	17,812		$	9,530

(1) During the three months ended September 30, 2017, the Company sold all of its ownership interests in three subsidiaries resulting in recognition of a net loss on sale of business of $1,424. See Note 4 for further information.

Effective September 30, 2016, the Company sold all of its ownership interests in Bryan Mills to the noncontrolling shareholders and recognized a loss of $800.

(2) During the third quarter of 2017, the Company sold one investment accounted for under the cost method and recognized a gain of $168. During the third quarter of 2016, the Company sold one investment accounted for under the equity method and one investment accounted for under the cost method and recognized a gain of $682.

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11. Segment Information

The Company determines an operating segment if a component (i) engages in business activities from which it earns revenues and incurs expenses, (ii) has discrete financial information, and is (iii) regularly reviewed by the Chief Operating Decision Maker (“CODM”) to make decisions regarding resource allocation for the segment and assess its performance. Once operating segments are identified, the Company performs an analysis to determine if aggregation of its operating segments is consistent with the principles detailed in ASC 280. This determination is based upon a quantitative analysis of the expected and historic average long-term profitability for each operating segment, together with an assessment of the qualitative characteristics set forth in ASC Topic 280-10-50.

The four reportable segments that meet the appropriate aggregation criteria are as follows: “Global Integrated Agencies”; “Domestic Creative Agencies”; “Specialist Communications”; and “Media Services.” In addition, the Company combines and discloses those operating segments that do not meet the aggregation criteria as “All Other.” The Company also reports corporate expenses, as further detailed below, as “Corporate.” All segments follow the same basis of presentation and accounting policies as those described in Note 1 and 2, respectively.

• The Global Integrated Agencies reportable segment is comprised of the Company’s six global, integrated operating segments with broad marketing communication capabilities, including advertising, branding, digital, social media, design and production services, serving multinational clients around the world. The Global Integrated Agencies reportable segment includes 72andSunny, Anomaly, Crispin Porter + Bogusky, Doner, Forsman & Bodenfors, and kbs+. These operating segments share similar characteristics related to (i) the nature of their services; (ii) the type of global clients and the methods used to provide services; and (iii) the extent to which they may be impacted by global economic and geopolitical risks. In addition, these operating segments compete with each other for new business and from time to time have business move between them. The Company believes the historic and expected average long-term profitability is similar among the operating segments aggregated in the Global Integrated Agencies reportable segment.

• The Domestic Creative Agencies reportable segment is comprised of four operating segments that are national advertising agencies leveraging creative capabilities at their core. The Domestic Creative Agencies reportable segment includes Colle + McVoy, Laird+Partners, Mono Advertising and Union. These operating segments share similar characteristics related to (i) the nature of their creative advertising services; (ii) the type of domestic client accounts and the methods used to provide services; and (iii) the extent to which they may be impacted by domestic economic and policy factors within North America. In addition, these operating segments compete with each other for new business and from time to time have business move between them. The Company believes the historic and expected average long-term profitability is similar among the operating segments aggregated in the Domestic Creative Agencies reportable segment.

• The Specialist Communications reportable segment is comprised of seven operating segments that are each communications agencies with core service offerings in public relations and related communications services. The Specialist Communications reportable segment includes Allison & Partners, Hunter PR, HL Group Partners, Kwittken, Luntz Global, Sloane & Company and Veritas. These operating segments share similar characteristics related to (i) the nature of their public relations and communication services, including content creation, social media and influencer marketing; (ii) the type of client accounts and the methods used to provide services; (iii) the extent to which they may be impacted by domestic economic and policy factors within North America; and (iv) the regulatory environment regarding public relations and social media. In addition, these operating segments compete with each other for new business and from time to time have business move between them. The Company believes the historic and expected average long-term profitability is similar among the operating segments aggregated in the Specialist Communications reportable segment.

• The Media Services reportable segment is comprised of a unique single operating segment known as MDC Media Partners. MDC Media Partners is comprised of the Company’s network of stand-alone agencies with media buying and planning as their core competency, including the integrated platform Assembly. The agencies within this single operating segment share a Chief Executive Officer and Chief Financial Officer, who have operational oversight of these agencies. These agencies provide other services, including influencer marketing, content, insights & analytics, out-of-home, paid search, social media, lead generation, programmatic, artificial intelligence, and corporate barter. MDC Media Partners operates primarily in North America.

• All Other consists of the Company’s remaining operating segments that provide a range of diverse marketing communication services, but generally do not have similar services offerings or financial characteristics as those aggregated in the reportable segments. The All Other category includes 6Degrees, Bruce Mau Design, Concentric Partners, Civilian, Gale Partners, Hello Design, Kenna, Kingsdale, Northstar Research Partners, Redscout, Relevent, Source Marketing, Team, Vitro, Yamamoto and Y Media Labs. The nature of the specialist services provided by these operating segments vary among each other and from those operating segments aggregated into the reportable segments. This results

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in these operating segments having current and long-term performance expectations inconsistent with those operating segments aggregated in the reportable segments.

• Corporate consists of corporate office expenses incurred in connection with the strategic resources provided to the operating segments, as well as certain other centrally managed expenses that are not fully allocated to the operating segments. These office and general expenses include (i) salaries and related expenses for corporate office employees, including employees dedicated to supporting the operating segments, (ii) occupancy expenses relating to properties occupied by all corporate office employees, (iii) other office and general expenses including professional fees for the financial statement audits and other public company costs, and (iv) certain other professional fees managed by the corporate office. Additional expenses managed by the corporate office that are directly related to the operating segments are allocated to the appropriate reportable segment and the All Other category.

	Three Months Ended   September 30,						Nine Months Ended   September 30,
	2017			2016			2017			2016
Revenue:
Global Integrated Agencies	$	193,979		$	177,262		$	576,935		$	489,880
Domestic Creative Agencies	24,173			22,181			67,473			66,274
Specialist Communications	40,670			40,309			125,470			123,006
Media Services	33,027			34,481			103,966			96,681
All Other	83,951			75,021			237,188			219,502
Total	$	375,800		$	349,254		$	1,111,032		$	995,343
Segment operating income (loss):
Global Integrated Agencies	$	19,819		$	2,873		$	33,765		$	24,316
Domestic Creative Agencies	5,716			4,688			13,563			14,779
Specialist Communications	4,775			11,101			13,410			17,860
Media Services	2,421			466			8,618			3,510
All Other	15,213			(22,828		)	31,626			(5,619		)
Corporate	(10,724		)	(7,051		)	(28,982		)	(32,982		)
Total	$	37,220		$	(10,751	)	$	72,000		$	21,864
Other Income (Expense):
Other income (expense), net	8,649			(6,008		)	17,812			9,530
Interest expense and finance charges, net	(16,258		)	(16,322		)	(48,309		)	(48,690		)
Loss on redemption of notes	—			—			—			(33,298		)
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates	29,611			(33,081		)	41,503			(50,594		)
Income tax expense (benefit)	9,049			(1,930		)	17,659			1,180
Income (loss) before equity in earnings of non-consolidated affiliates	20,562			(31,151		)	23,844			(51,774		)
Equity in earnings of non-consolidated affiliates	1,422			70			1,924			9
Net income (loss)	21,984			(31,081		)	25,768			(51,765		)
Net income attributable to the noncontrolling interest	(3,491		)	(1,059		)	(6,588		)	(3,172		)
Net income (loss) attributable to MDC Partners Inc.	$	18,493		$	(32,140	)	$	19,180		$	(54,937	)

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	Three Months Ended   September 30,				Nine Months Ended   September 30,
	2017		2016		2017		2016
Depreciation and amortization:
Global Integrated Agencies	$	6,359	$	6,111	$	17,889	$	14,986
Domestic Creative Agencies	$	336	$	353	$	1,062	$	1,263
Specialist Communications	$	1,220	$	189	$	3,657	$	5,123
Media Services	$	917	$	2,338	$	2,933	$	4,437
All Other (1)	$	2,165	$	31,693	$	6,511	$	36,624
Corporate	$	255	$	359	$	864	$	1,266
Total	$	11,252	$	41,043	$	32,916	$	63,699
(1) Includes impairment of goodwill charge of $29,631 for the three and nine months ended September 30, 2016.
Stock-based compensation:
Global Integrated Agencies	$	3,840	$	2,890	$	9,892	$	9,030
Domestic Creative Agencies	$	177	$	150	$	502	$	487
Specialist Communications	$	659	$	564	$	2,264	$	1,556
Media Services	$	150	$	70	$	464	$	187
All Other	$	1,077	$	949	$	2,149	$	2,124
Corporate	$	477	$	605	$	1,599	$	2,059
Total	$	6,380	$	5,228	$	16,870	$	15,443
Capital expenditures:
Global Integrated Agencies	$	1,950	$	3,003	$	17,639	$	10,703
Domestic Creative Agencies	$	324	$	222	$	874	$	920
Specialist Communications	$	206	$	56	$	673	$	2,183
Media Services	$	2,171	$	2,008	$	3,455	$	2,634
All Other	$	2,497	$	985	$	5,660	$	3,251
Corporate	$	1	$	—	$	4	$	32
Total	$	7,149	$	6,274	$	28,305	$	19,723

The Company’s CODM does not use segment assets to allocate resources or to assess performance of the segments and therefore, total segment assets have not been disclosed.

A summary of the Company’s revenue by geographic area, based on the location in which the services originated, is set forth in the following table:

	United States		Canada		Other		Total
Revenue
Three Months Ended September 30,
2017	$	289,702	$	31,418	$	54,680	$	375,800
2016	$	274,506	$	30,233	$	44,515	$	349,254
Nine Months Ended September 30,
2017	$	868,847	$	88,471	$	153,714	$	1,111,032
2016	$	799,696	$	92,253	$	103,394	$	995,343

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12. Commitments, Contingencies, and Guarantees

Deferred Acquisition Consideration. In addition to the consideration paid by the Company in respect of certain of its acquisitions at closing, additional consideration may be payable, or may be potentially payable based on the achievement of certain threshold levels of earnings. See Notes 2, 4, and 9.

Options to purchase. Noncontrolling shareholders in certain subsidiaries have the right in certain circumstances to require the Company to acquire the remaining ownership interests held by them. The noncontrolling shareholders’ ability to exercise any such option right is subject to the satisfaction of certain conditions, including conditions requiring notice in advance of exercise and specific employment termination conditions. In addition, these rights cannot be exercised prior to specified staggered exercise dates. The exercise of these rights at their earliest contractual date would result in obligations of the Company to fund the related amounts during the remainder of 2017 to 2023. It is not determinable, at this time, if or when the owners of these rights will exercise all or a portion of these rights.

The amount payable by the Company in the event such rights are exercised is dependent on various valuation formulas and on future events, such as the average earnings of the relevant subsidiary through the date of exercise, the growth rate of the earnings of the relevant subsidiary during that period and, in some cases, the currency exchange rate at the date of payment.

Management estimates, assuming that the subsidiaries owned by the Company at September 30, 2017, perform over the relevant future periods at their trailing twelve-months earnings levels, that these rights, if all exercised, could require the Company, in future periods, to pay an aggregate amount of approximately $15,493 to the owners of such rights to acquire such ownership interests in the relevant subsidiaries. Of this amount, the Company is entitled, at its option, to fund approximately $202 by the issuance of share capital.

In addition, the Company is obligated under similar contractual rights to pay an aggregate amount of approximately $42,268 only upon termination of such owner’s employment with the applicable subsidiary or death.

The amount the Company would be required to pay to the noncontrolling interest holders should the Company acquire the remaining ownership interests is $2,330 less than the initial redemption value recorded in redeemable noncontrolling interests.

Included in redeemable noncontrolling interests at September 30, 2017 was $60,092 of these options to purchase because they are not within the control of the Company. The ultimate amount payable relating to these transactions will vary because it is dependent on the future results of operations of the subject businesses and the timing of when these rights are exercised.

Natural Disasters. Certain of the Company’s operations are located in regions of the United States which typically are subject to hurricanes. During the nine months ended September 30, 2017 and 2016, these operations did not incur any costs related to damages resulting from hurricanes.

Guarantees. Generally, the Company has indemnified the purchasers of certain assets in the event that a third party asserts a claim against the purchaser that relates to a liability retained by the Company. These types of indemnification guarantees typically extend for a number of years. Historically, the Company has not made any significant indemnification payments under such agreements and no amount has been accrued in the accompanying consolidated financial statements with respect to these indemnification guarantees. The Company continues to monitor the conditions that are subject to guarantees and indemnifications to identify whether it is probable that a loss has occurred, and would recognize any such losses under any guarantees or indemnifications in the period when those losses are probable and estimable.

Legal Proceedings. The Company’s operating entities are involved in legal proceedings of various types. While any litigation contains an element of uncertainty, the Company has no reason to believe that the outcome of such proceedings or claims will have a material adverse effect on the financial condition or results of operations of the Company. In addition, the Company is involved in class action suits as described below.

Class Action Litigation in Canada. On August 7, 2015, Roberto Paniccia issued a Statement of Claim in the Ontario Superior Court of Justice in the City of Brantford, Ontario seeking to certify a class action suit naming the following as defendants: MDC, former CEO Miles S. Nadal, former CAO Michael C. Sabatino, CFO David Doft and BDO U.S.A. LLP. The Plaintiff alleges violations of section 138.1 of the Ontario Securities Act (and equivalent legislation in other Canadian provinces and territories) as well as common law misrepresentation based on allegedly materially false and misleading statements in the Company’s public statements, as well as omitting to disclose material facts with respect to the SEC investigation. The Company intends to continue to vigorously defend this Canadian suit on the same basis as which the U.S. class action was previously dismissed. A first case management meeting has been held. The plaintiff has served his material for leave to proceed under the Securities Act. MDC and the other defendants have served a motion to limit the scope of the proposed class definition to Canadian residents who purchased and sold shares of MDC stock on the Toronto Stock Exchange. Those motions are returnable in the fourth quarter of 2017.

Antitrust Subpoena. One of the Company’s subsidiaries received a subpoena from the U.S. Department of Justice Antitrust Division concerning the Division’s ongoing investigation of production practices in the advertising industry. The Company and its subsidiary are fully cooperating with this confidential investigation.

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Commitments.  At September 30, 2017, the Company had issued $5,009 of undrawn outstanding letters of credit. In addition, the Company has commitments to fund investments in an aggregate amount of $198.

13. New Accounting Pronouncements

In May 2017, the FASB issued Accounting Standards Update (“ASU”) 2017-09, Compensation - Stock Compensation: Scope of Modification Accounting, which provides guidance concerning which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in ASC 718.  This guidance is effective for annual and interim periods beginning after December 15, 2017, and early adoption is permitted. Amendments in this ASU will be applied prospectively to any award modified on or after the adoption date.  The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits, which requires the presentation of the service cost component of the net periodic pension and postretirement benefits costs in the same line item in the statement of operations as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of the net periodic pension and postretirement benefits costs are required to be presented as non-operating expenses in the statement of operations. This guidance is effective for annual periods beginning after December 15, 2017 and early adoption is permitted. The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other: Simplifying the Test for Goodwill Impairment, which eliminates step two from the two-step goodwill impairment test. Under the new guidance, an entity will perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value provided the loss recognized does not exceed the total amount of goodwill allocated to that reporting unit. This guidance is effective for annual or interim goodwill impairment tests performed in fiscal years beginning after December 15, 2019. The Company will early adopt this guidance for our impairment test performed during 2017, and does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows. This new guidance is intended to reduce diversity in practice regarding the classification of certain transactions in the statement of cash flows. This guidance is effective January 1, 2018 and requires a retrospective transition method. Early adoption is permitted. The Company currently classifies all cash outflows for contingent consideration as a financing activity. Upon adoption the Company is required to classify only the original estimated liability as a financing activity and any changes as an operating activity.

In February 2016, the FASB issued ASU 2016-02, which amends the ASC and creates Topic 842, Leases. Topic 842 will require lessees to recognize right-to-use assets and lease liabilities for those leases classified as operating leases under previous U.S. GAAP on the balance sheet. This guidance is effective for annual periods beginning after December 15, 2018 and early adoption is permitted. While not yet in a position to assess the full impact of the application of the new standard, the Company expects that the impact of recording the lease liabilities and the corresponding right-to-use assets will have a significant impact on its total assets and liabilities with a minimal impact on equity.

In January 2016, the FASB issued ASU 2016-01,Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Liabilities, which will require equity investments, except equity method investments, to be measured at fair value and any changes in fair value will be recognized in results of operations. This guidance is effective for annual and interim periods beginning after December 15, 2017 and early application is not permitted. Additionally, this guidance provides for the recognition of the cumulative effect of retrospective application of the new standard in the period of initial application. The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which will replace all existing revenue guidance under U.S GAAP. The core principle of ASU 2014-09 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration expected to be received in exchange for those goods or services. On July 9, 2015, the FASB approved a one year deferral of the effective date of ASU 2014-09 to all annual and interim periods beginning after December 15, 2017. ASU 2014-09 provides for one of two methods of transition: (i) retrospective application to each prior period presented (Full Retrospective); or (ii) recognition of the cumulative effect of retrospective application of the new standard as of the beginning of the period of initial application (Modified Retrospective). The Company plans to apply ASU 2014-09 on the effective date of January 1, 2018, and intends to apply the Modified Retrospective method. Based on the Company’s assessment, the application of the new standard will result in a change in the timing of our revenue recognition within certain of the Company’s arrangements. Performance incentives are currently recognized in revenue when specific quantitative goals are achieved, or when the Company’s performance against qualitative goals is determined by the client. Under the new standard, the Company will be required to estimate the amount of the incentive that will be earned at the inception of the contract and recognize

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such incentive over the term of the contract. While performance incentives are not material to the Company’s revenue, this will result in an acceleration of revenue recognition for certain contract incentives compared to the current method. Further, based on the Company’s initial assessment, it is expected that an input measure such as cost to cost or labor hours would be an appropriate measure of progress in the majority of situations for which over time revenue recognition is applied.

Furthermore, in certain businesses, the Company records revenue as a principal and includes certain third-party-pass-through and out-of-pocket costs, which are billed to clients in connection with the services provided. In March 2016, the FASB issued further guidance on principal versus agent considerations; however, our initial assessments indicate that such change is not expected to have a material effect on the Company’s results of operations. The Company is continuing to evaluate the standard’s impact on the consolidated results of operations and financial condition, and the related disclosure requirements.

Item 2.    Management’s Discussion and Analysis of Financial Condition and Results of Operations

Unless otherwise indicated, references to the “Company” or “MDC” mean MDC Partners Inc. and its subsidiaries, and references to a fiscal year means the Company’s year commencing on January 1 of that year and ending December 31 of that year (e.g., fiscal 2017 means the period beginning January 1, 2017, and ending December 31, 2017).

The Company reports its financial results in accordance with generally accepted accounting principles (“GAAP”) of the United States of America (“U.S. GAAP”). In addition, the Company has included certain non-U.S. GAAP financial measures and ratios, which it believes provide useful supplemental information to both management and readers of this report in measuring the financial performance and financial condition of the Company. These measures do not have a standardized meaning prescribed by U.S. GAAP and should not be construed as an alternative to other titled measures determined in accordance with U.S. GAAP.

Two such non-U.S. GAAP measures are “organic revenue growth” or “organic revenue decline” that refer to the positive or negative results, respectively, of subtracting both the foreign exchange and acquisition (disposition) components from total revenue growth. The acquisition (disposition) component is calculated by aggregating the prior period revenue for any acquired businesses, less the prior period revenue of any businesses that were disposed of in the current period. The organic revenue growth (decline) component reflects the constant currency impact (a) of the change in revenue of the Partner Firms which the Company has held throughout each of the comparable periods presented and (b) “non-GAAP acquisitions (dispositions), net.” Non-GAAP acquisitions (dispositions), net consists of (i) for acquisitions during the current year, the revenue effect from such acquisition as if the acquisition had been owned during the equivalent period in the prior year and (ii) for acquisitions during the previous year, the revenue effect from such acquisitions as if they had been owned during that entire year or same period as the current reportable period, taking into account their respective pre-acquisition revenues for the applicable periods and (iii) for dispositions, the revenue effect from such disposition as if they had been disposed of during the equivalent period in the prior year. The Company believes that isolating the impact of acquisition activity and foreign currency impacts is an important and informative component to understand the overall change in the Company’s consolidated revenue. The change in the consolidated revenue that remains after these adjustments illustrates the underlying financial performance of the Company’s businesses. Specifically, it represents the impact of the Company’s management oversight, investments and resources dedicated to supporting the businesses’ growth strategy and operations. In addition, it reflects the network benefit of inclusion in the broader portfolio of firms that includes, but is not limited to, cross-selling and sharing of best practices. This approach isolates changes in performance of the business that take place under the Company’s stewardship, whether favorable or unfavorable, and thereby reflects the potential benefits and risks associated with owning and managing a talent-driven services business.

Accordingly, during the first twelve months of ownership by the Company, the organic growth measure may credit the Company with growth from an acquired business that is dependent on work performed prior to the acquisition date, and may include the impact of prior work in progress, existing contracts and backlog of the acquired businesses. It is the presumption of the Company that positive developments that may have taken place at an acquired business during the period preceding the acquisition will continue to result in value creation in the post-acquisition period.

While the Company believes that the methodology used in the calculation of organic revenue change is entirely consistent with our closest U.S. competitors, the calculations may not be comparable to similarly titled measures presented by other publicly traded companies in other industries. Additional information regarding the Company’s acquisition activity as it relates to potential revenue growth is provided in Item 2 “Management’s Discussion and Analysis of Financial Condition and Results of Operations” under “Certain Factors Affecting our Business.”

The following discussion focuses on the operating performance of the Company for the nine months ended September 30, 2017 and 2016 and the financial condition of the Company as of September 30, 2017. This analysis should be read in conjunction with the interim condensed consolidated financial statements presented in this interim report and the annual audited consolidated financial statements and Management’s Discussion and Analysis presented in the Annual Report for the year ended December 31, 2016 as reported on the Annual Report on Amendment No. 1 on Form 10-K/A (the "Annual Report on Form 10-K/A"). All amounts are in dollars unless otherwise stated. Amounts reported in millions herein are computed based on the amounts in thousands. As a result, the sum of the components, and related calculations, reported in millions may not equal the total amounts due to rounding.

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Executive Summary

MDC conducts its business through its network of Partner Firms, the “Advertising and Communications Group,” who provide a comprehensive array of marketing and communications services for clients both domestically and globally. The Company’s objective is to create shareholder value by building, growing and acquiring market-leading Partner Firms that deliver innovative, value-added marketing, activation, communications and strategic consulting to their clients. Management believes that shareholder value is maximized with an operating philosophy of “Perpetual Partnership” with proven committed industry leaders in marketing communications.

MDC manages its business by monitoring several financial and non-financial performance indicators. The key indicators that we focus on are revenues, operating expenses and capital expenditures. Revenue growth is analyzed by reviewing a mix of measurements, including (i) growth by major geographic location, (ii) growth by client industry vertical, (iii) growth from existing clients and the addition of new clients, (iv) growth by primary discipline (v) growth from currency changes, and (vi) growth from acquisitions. In addition to monitoring the foregoing financial indicators, the Company assesses and monitors several non-financial performance indicators relating to the business performance of our Partner Firms. These indicators may include a Partner Firm’s recent new client win/loss record; the depth and scope of a pipeline of potential new client account activity; the overall quality of the services provided to clients; and the relative strength of the Partner Firm’s next generation team that is in place as part of a potential succession plan to succeed the current senior executive team.

As discussed in Note 11 of the Notes to Unaudited Condensed Consolidated Financial Statements, the Company aggregates operating segments that meet the aggregation criteria detailed in ASC 280 into one of the four reportable segments and combines and discloses those operating segments that do not meet the aggregation criteria in the All Other category.The following discussion provides additional detailed disclosure for each of the Company’s four reportable segments, plus the All Other category, within the Advertising and Communications Group.

The four reportable segments are as follows:

Global Integrated Agencies - This segment is comprised of the Company’s six global, integrated operating segments with broad marketing communication capabilities, including advertising, branding, digital, social media, design and production services, serving multinational clients around the world.

Domestic Creative Agencies - This segment is comprised of four operating segments that are national advertising agencies leveraging creative capabilities at their core.

Specialist Communications Agencies - This segment is comprised of seven operating segments that are each communications agencies with core service offerings in public relations and related communications services.

Media Services - This segment is comprised of a unique single operating segment with media buying and planning as its core competency.

The All Other category consists of the Company’s remaining operating segments that provide a range of diverse marketing communication services, but are not eligible for aggregation with the reportable segments in accordance with ASC 280.

In addition, MDC reports its corporate office expenses incurred in connection with the strategic resources provided to the operating segments, as well as certain other centrally managed expenses that are not fully allocated to the operating segments as Corporate. Corporate provides client and business development support to the operating segements as well as certain strategic resources, including accounting, administrative, financial, real estate, human resource and legal functions. Additional expenses managed by the corporate office that are directly related to the operating segments are allocated to the appropriate reportable segment and the All Other category.

Certain Factors Affecting Our Business

Overall Factors Affecting our Business and Results of Operations.  The most significant factors include national, regional and local economic conditions, our clients’ business trends and profitability, mergers and acquisitions of our clients, changes in top management of our clients and our ability to retain and attract key employees. New business wins and client losses occur due to a variety of factors. The two most significant factors are (i) our clients’ desire to change marketing communication firms, and (ii) the creative product that our Partner Firms offer. A client may choose to change marketing communication firms for a number of reasons, such as a change in top management and the new management wants to retain an agency that it may have previously worked with. In addition, if the client is merged or acquired by another company, the marketing communication firm is often changed. Further, global clients are trending to consolidate the use of numerous marketing communication firms to just one or two. Another factor in a client changing firms is the agency’s campaign or work product is not providing results and client’s feel a change is in order to generate additional revenues.

Clients will generally reduce or increase their spending or outsourcing needs based on their current business trends and profitability.

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Acquisitions and Dispositions. The Company’s strategy includes acquiring ownership stakes in well-managed businesses with world class expertise and strong reputations in the industry. The Company’s corporate group provides post-acquisition support to Partner Firms in order to help accelerate growth, including in areas such as business and client development (including cross-selling), corporate communications, corporate development, talent recruitment and training, procurement, legal services, human resources, financial management and reporting, and real estate utilization, among other areas. As most of the Company’s acquisitions remain as stand-alone entities post acquisition, integration is typically implemented promptly, and new Partner Firms can begin to tap into the full range of MDC’s resources immediately. Often the acquired businesses may begin to tap into certain MDC resources in the pre-acquisition period, such as talent recruitment or real estate. The Company engaged in a number of acquisition and disposition transactions during the 2009 to 2016 period, which affected revenues, expenses, operating income and net income. Additional information regarding acquisitions is provided in Note 4 of the Notes to Unaudited Condensed Consolidated Financial Statements.

Foreign Exchange Fluctuations. Our financial results and competitive position are affected by fluctuations in the exchange rate between the U.S. dollar and non-U.S. dollars, primarily the Canadian dollar. See also “Quantitative and Qualitative Disclosures About Market Risk — Foreign Exchange.”

Seasonality. Historically, with some exceptions, the Company generates the lowest quarterly revenue and lowest volume of media placements during the first quarter while the Company generates the highest quarterly revenues and highest volume of media placements during the fourth quarter ever year.

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Results of Operations:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
	2017			2016			2017			2016
Revenue:
Global Integrated Agencies	$	193,979		$	177,262		$	576,935		$	489,880
Domestic Creative Agencies	24,173			22,181			67,473			66,274
Specialist Communications	40,670			40,309			125,470			123,006
Media Services	33,027			34,481			103,966			96,681
All Other	83,951			75,021			237,188			219,502
Total	$	375,800		$	349,254		$	1,111,032		$	995,343
Segment operating income (loss):
Global Integrated Agencies	$	19,819		$	2,873		$	33,765		$	24,316
Domestic Creative Agencies	5,716			4,688			13,563			14,779
Specialist Communications	4,775			11,101			13,410			17,860
Media Services	2,421			466			8,618			3,510
All Other	15,213			(22,828		)	31,626			(5,619		)
Corporate	(10,724		)	(7,051		)	(28,982		)	(32,982		)
Total	$	37,220		$	(10,751	)	$	72,000		$	21,864
Other Income (Expense):
Other income (expense), net	8,649			(6,008		)	17,812			9,530
Interest expense and finance charges, net	(16,258		)	(16,322		)	(48,309		)	(48,690		)
Loss on redemption of notes	—			—			—			(33,298		)
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates	29,611			(33,081		)	41,503			(50,594		)
Income tax expense (benefit)	9,049			(1,930		)	17,659			1,180
Income (loss) before equity in earnings of non-consolidated affiliates	20,562			(31,151		)	23,844			(51,774		)
Equity in earnings of non-consolidated affiliates	1,422			70			1,924			9
Net income (loss)	21,984			(31,081		)	25,768			(51,765		)
Net income attributable to the noncontrolling interest	(3,491		)	(1,059		)	(6,588		)	(3,172		)
Net income (loss) attributable to MDC Partners Inc.	$	18,493		(32,140		)	19,180			(54,937		)

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	Three Months Ended   September 30,				Nine Months Ended   September 30,
	2017		2016		2017		2016
Depreciation and amortization:
Global Integrated Agencies	$	6,359	$	6,111	$	17,889	$	14,986
Domestic Creative Agencies	336		353		1,062		1,263
Specialist Communications	1,220		189		3,657		5,123
Media Services	917		2,338		2,933		4,437
All Other (1)	2,165		31,693		6,511		36,624
Corporate	255		359		864		1,266
Total	$	11,252	$	41,043	$	32,916	$	63,699
(1) Includes impairment of goodwill charge of $29,631 for the three and nine months ended September 30, 2016.
Stock-based compensation:
Global Integrated Agencies	$	3,840	$	2,890	$	9,892	$	9,030
Domestic Creative Agencies	177		150		502		487
Specialist Communications	659		564		2,264		1,556
Media Services	150		70		464		187
All Other	1,077		949		2,149		2,124
Corporate	477		605		1,599		2,059
Total	$	6,380	$	5,228	$	16,870	$	15,443
Capital expenditures:
Global Integrated Agencies	$	1,950	$	3,003	$	17,639	$	10,703
Domestic Creative Agencies	324		222		874		920
Specialist Communications	206		56		673		2,183
Media Services	2,171		2,008		3,455		2,634
All Other	2,497		985		5,660		3,251
Corporate	1		—		4		32
Total	$	7,149	$	6,274	$	28,305	$	19,723

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Three Months Ended September 30, 2017 Compared to Three Months Ended September 30, 2016

Revenue was $375.8 million for the three months ended September 30, 2017, compared to revenue of $349.3 million for the three months ended September 30, 2016, representing an increase of $26.5 million, or 7.6%. The change in revenue was driven by revenue growth from existing Partner Firms of $27.1 million, or 7.8% and a positive foreign exchange impact of $2.6 million, or 0.8%, partially offset by a negative impact from dispositions of $3.2 million, or 0.9%.

Operating profit for the three months ended September 30, 2017 was $37.2 million compared to an operating loss of $10.8 million for the three months ended September 30, 2016, representing an increase of $48.0 million. The increase in operating profit was primarily driven by an increase in operating profit in the Advertising and Communications Group of $51.6 million, partially offset by an increase in Corporate operating expenses of $3.7 million.

Net income was $22.0 million for the three months ended September 30, 2017 compared to a net loss of $31.1 million for the three months ended September 30, 2016, representing a net income increase of $53.1 million. The increase was primarily attributable to an increase in operating profit of $48.0 million and an increase in foreign exchange gain of $15.8 million, partially offset by an increase in income tax expense of $11.0 million.

Advertising and Communications Group

The following discussion provides additional detailed disclosure for each of the Company’s four (4) reportable segments, plus “All Other,” within the Advertising and Communications Group.

Revenue in the Advertising and Communications Group was $375.8 million for the three months ended September 30, 2017 compared to revenue of $349.3 million for the three months ended September 30, 2016, representing an increase of $26.5 million, or 7.6%. The change in revenue was driven by revenue growth from existing Partner Firms of $27.1 million, or 7.8%, and a positive foreign exchange impact of $2.6 million, or 0.8%, partially offset by a negative impact from dispositions of $3.2 million, or 0.9%. Revenue growth was attributable to net new client wins, increased spending as well as expanded scopes of services by existing clients, and higher pass-through costs. The performance by client sector was led by growth in communications, financials, food & beverage, partially offset by a decline in technology, retail, and automotive.

Revenue growth in the Advertising and Communications Group was driven by the Company’s business in the United States with growth of $15.2 million, or 5.5%, due to new business wins, increased spending as well as expanded scopes of services by existing clients, and higher pass-through costs. In Canada, revenue increased by $1.2 million, or 3.9% mostly due to a positive foreign exchange impact. Outside of the North American region, revenue growth was $10.2 million, or 22.8%, primarily driven by new client wins, increased spend from existing clients, and higher pass-through costs as we continue to extend our capabilities into new markets throughout Europe, Asia, and to a lesser degree, South America.

The Company also utilizes non-GAAP metrics called organic revenue growth (decline) and non-GAAP acquisitions (dispositions), net, as defined in Item 2. For the three months ended September 30, 2017 organic revenue growth was $27.1 million, or 7.8%, all of which pertained to Partner Firms which the Company has owned throughout each of the comparable periods presented. The other components of non-GAAP activity include a negative non-GAAP acquisition (disposition), net adjustment of $3.2 million, or 0.9%, and a positive foreign exchange impact of $2.6 million, or 0.8%.

The components of the change in revenues for the three months ended September 30, 2017 are as follows:

			2017 Non-GAAP Activity									Change
Advertising and Communications Group	2016 Revenue		Foreign Exchange		Non-GAAP Acquisitions (Dispositions), net			Organic Revenue Growth (Decline)		2017 Revenue		Foreign Exchange		Non-GAAP Acquisitions (Dispositions), net		Organic Revenue Growth (Decline)		Total Revenue
	(Dollars in Millions)
United States	$	274.5	$	—	$	(1.2	)	$	16.4	$	289.7	—	%	(0.5	)%	6.0	%	5.5	%
Canada	30.2		1.3		(0.1		)	—		31.4		4.2	%	(0.5	)%	0.2	%	3.9	%
Other	44.5		1.3		(1.8		)	10.6		54.7		3.0	%	(3.9	)%	23.8	%	22.8	%
Total	$	349.3	$	2.6	$	(3.2	)	$	27.1	$	375.8	0.8	%	(0.9	)%	7.8	%	7.6	%

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The table below provides a reconciliation between the revenue in the Advertising and Communications Group from acquired businesses in the statement of operations to non-GAAP acquisitions (dispositions), net for the three months ended September 30, 2017:

	Global Integrated Agencies			Media Services			All Other			Total
	(Dollars in Millions)
GAAP revenue from 2016 acquisitions (1)	$	—		$	—		$	—		$	—
Foreign exchange impact	—			—			—			—
Contribution to non-GAAP organic revenue (growth) decline (2)	—			—			—			—
Prior year revenue from dispositions	(1.8		)	(1.2		)	(0.1		)	(3.2		)
Non-GAAP acquisitions (dispositions), net	$	(1.8	)	$	(1.2	)	$	(0.1	)	$	(3.2	)

(1) Operating segments not impacted by revenue from acquired Partner Firms in the current and prior period were excluded. In addition, no acquisitions were completed during 2017. Refer to Note 4 of the Notes to Unaudited Condensed Consolidated Financial Statements included herein for further information pertaining to the current year dispositions.

(2) Contributions to organic revenue growth (decline) represents the change in revenue, measured on a constant currency basis, relative to the comparable pre-acquisition period for acquired businesses that is included in the Company’s organic revenue growth (decline) calculation.

The geographic mix in revenues for the three months ended September 30, 2017 and 2016 is as follows:

	2017		2016
United States	77.1	%	78.6	%
Canada	8.4	%	8.7	%
Other	14.5	%	12.7	%

Organic revenue growth in the Advertising and Communications Group was driven by the Company’s business in the United States with growth of $16.4 million, or 6.0%, due to net new client wins, increased spending by existing clients, and higher pass-through costs. In Canada, organic revenue increased slightly as increased client spending was mostly offset by a decrease in pass-through costs. Organic revenue growth from outside of North America was $10.6 million, or 23.8% driven by new client wins and increased spend from existing clients as we continue to extend our capabilities into new markets throughout Europe, Asia, and to a lesser degree, South America.

The positive foreign exchange impact of $2.6 million, or 0.8%, was primarily due to the strengthening of the Canadian dollar and the Swedish Króna against the U.S. dollar.

The change in expenses as a percentage of revenue in the Advertising and Communications Group for the three months ended September 30, 2017 and 2016 was as follows:

	2017				2016					Change
Advertising and Communications Group	$		% of Revenue		$			% of Revenue		$			%
	(Dollars in Millions)
Revenue	$	375.8			$	349.3				$	26.5		7.6	%
Operating expenses
Cost of services sold	249.4		66.4	%	235.7			67.5	%	13.8			5.8	%
Office and general expenses	67.4		17.9	%	76.6			21.9	%	(9.2		)	(12.0	)%
Depreciation and amortization	11.0		2.9	%	11.1			3.2	%	(0.1		)	(0.5	)%
Goodwill impairment	—		—	%	29.6			8.5	%	(29.6		)	(100.0	)%
	$	327.9	87.2	%	$	353.0		101.1	%	$	(25.1	)	(7.1	)%
Operating profit (loss)	$	47.9	12.8	%	$	(3.7	)	(1.1	)%	$	51.6		(1,395.1	)%

Operating profit in the Advertising and Communications Group for the three months ended September 30, 2017 was $47.9 million compared to an operating loss of $3.7 million for the three months ended September 30, 2016, representing an increase

33

of $51.6 million. Operating margins improved from a loss margin of 1.1% in 2016 to a profit margin of 12.8% in 2017. The increase in operating profit and margin was largely due to a goodwill impairment of $29.6 million recognized in 2016, income attributable to deferred acquisition consideration, and decreased staff costs as a percentage of revenue, partially offset by increased direct costs as a percentage of revenue.

The change in the categories of expenses as a percentage of revenue in the Advertising and Communications Group for the three months ended September 30, 2017 and 2016 was as follows:

	2017					2016				Change
Advertising and Communications Group	$			% of Revenue		$		% of Revenue		$			%
	(Dollars in Millions)
Direct costs (1)	$	62.9		16.7	%	$	53.4	15.3	%	$	9.5		17.8	%
Staff costs (2)	204.2			54.3	%	198.0		56.7	%	6.2			3.1	%
Administrative	46.3			12.3	%	45.1		12.9	%	1.2			2.7	%
Deferred acquisition consideration	(2.5		)	(0.7	)%	11.2		3.2	%	(13.6		)	(122.1	)%
Stock-based compensation	5.9			1.6	%	4.6		1.3	%	1.3			27.7	%
Depreciation and amortization	11.0			2.9	%	11.1		3.2	%	(0.1		)	(0.5	)%
Goodwill impairment	—			—	%	29.6		8.5	%	(29.6		)	(100.0	)%
Total operating expenses	$	327.9		87.2	%	$	353.0	101.1	%	$	(25.1	)	(7.1	)%

(1) Excludes staff costs.

(2) Excludes stock-based compensation and is comprised of amounts reported in both cost of services and office and general expenses.

Direct costs in the Advertising and Communications Group for the three months ended September 30, 2017 were $62.9 million compared to $53.4 million for the three months ended September 30, 2016, representing an increase of $9.5 million, or 17.8%. As a percentage of revenue, direct costs increased from 15.3% in 2016 to 16.7% in 2017. The increase in direct costs and as a percentage of revenue was primarily due to an increase in costs incurred on the client’s behalf from some of our Partner Firms acting as principal.

Staff costs in the Advertising and Communications Group for the three months ended September 30, 2017 were $204.2 million compared to $198.0 million for the three months ended September 30, 2016, representing an increase of $6.2 million, or 3.1%. The increase in staff costs was due to higher costs to support an increased level of new business activities by certain Partner Firms. As a percentage of revenue, staff costs decreased from 56.7% in 2016 to 54.3% in 2017. The decrease in staff costs as a percentage of revenue was primarily driven by revenue growth as well as savings pertaining to headcount action taken in prior periods.

Goodwill impairment in the Advertising and Communications Group for the three months ended September 30, 2016 was $29.6 million, which was comprised of a partial impairment of goodwill of $27.9 million relating to an experiential reporting unit and a partial impairment of goodwill of $1.7 million relating to a non-material reporting unit, all of which is reported in the All Other category. No such goodwill impairment was recognized during the three months ended September 30, 2017.

Deferred acquisition consideration in the Advertising and Communications Group for the three months ended September 30, 2017 was income of $2.5 million compared to an expense of $11.2 million for the three months ended September 30, 2016, representing a change of $13.6 million. The change in the deferred acquisition consideration adjustment was primarily due to the increased estimated liability in the prior period driven by the decrease in the Company’s estimated future stock price, pertaining to an equity funded acquisition.

Stock-based compensation in the Advertising and Communications Group remained consistent at approximately 1.4% of revenue for the three months ended September 30, 2016 and 2017.

Depreciation and amortization expense in the Advertising and Communications Group remained consistent at approximately $11.0 million for the three months ended September 30, 2016 and 2017.

34

Global Integrated Agencies

Revenue in the Global Integrated Agencies reportable segment was $194.0 million for the three months ended September 30, 2017 compared to revenue of $177.3 million for the three months ended September 30, 2016, representing an increase of $16.7 million, or 9.4%. The change in revenue was driven by revenue growth from existing Partner Firms of $16.8 million, or 9.5%, and a positive foreign exchange impact of $1.6 million, or 0.9%, partially offset by a negative impact from dispositions of $1.8 million, or 1.0%. Revenue growth was primarily due to new business wins, increased spending as well as expanded scopes of services by existing clients, and higher pass-through costs.

The change in expenses as a percentage of revenue in the Global Integrated Agencies reportable segment for the three months ended September 30, 2017 and 2016 was as follows:

	2017				2016				Change
Global Integrated Agencies	$		% of Revenue		$		% of Revenue		$			%
	(Dollars in Thousands)
Revenue	$	194.0			$	177.3			$	16.7		9.4	%
Operating expenses
Cost of services sold	128.8		66.4	%	119.0		67.1	%	9.8			8.2	%
Office and general expenses	39.0		20.1	%	49.3		27.8	%	(10.3		)	(20.9	)%
Depreciation and amortization	6.4		3.3	%	6.1		3.4	%	0.2			4.0	%
	$	174.2	89.8	%	$	174.4	98.4	%	$	(0.2	)	(0.1	)%
Operating profit	$	19.8	10.2	%	$	2.9	1.6	%	$	17.0		591.8	%

Operating profit in the Global Integrated Agencies reportable segment for the three months ended September 30, 2017 was $19.8 million compared to $2.9 million for the three months ended September 30, 2016, representing an increase of $17.0 million, or 591.8%. Operating margins improved by 860 basis points from 1.6% for 2016 to 10.2% for 2017. The increase in operating profit and margin was due to increased revenue growth, a decline in deferred acquisition consideration adjustments, and improvements in staff costs as a percentage of revenue, partially offset by increased direct costs.

The change in the categories of expenses as a percentage of revenue in the Global Integrated Agencies reportable segment for the three months ended September 30, 2017 and 2016 was as follows:

	2017				2016				Change
Global Integrated Agencies	$		% of Revenue		$		% of Revenue		$			%
	(Dollars in Millions)
Direct costs (1)	$	24.5	12.7	%	$	15.6	8.8	%	$	9.0		57.8	%
Staff costs (2)	111.3		57.4	%	111.6		63.0	%	(0.3		)	(0.3	)%
Administrative	26.2		13.5	%	22.4		12.6	%	3.8			17.1	%
Deferred acquisition consideration	1.9		1.0	%	15.9		8.9	%	(14.0		)	(88.0	)%
Stock-based compensation	3.8		2.0	%	2.9		1.6	%	1.0			32.9	%
Depreciation and amortization	6.4		3.3	%	6.1		3.4	%	0.2			4.0	%
Total operating expenses	$	174.2	89.8	%	$	174.4	98.4	%	$	(0.2	)	(0.1	)%

(1) Excludes staff costs.

(2) Excludes stock-based compensation and is comprised of amounts reported in both cost of services and office and general expenses.

Direct costs in the Global Integrated Agencies reportable segment for the three months ended September 30, 2017 were $24.5 million compared to $15.6 million for the three months ended September 30, 2016, representing an increase of $9.0 million, or 57.8%. As a percentage of revenue, direct costs increased from 8.8% in 2016 to 12.7% in 2017. The increase in direct costs and as a percentage of revenue was primarily due to an increase in costs incurred on certain clients’ behalf from some of our existing Partner Firms acting as principal.

35

Staff costs in the Global Integrated Agencies reportable segment for the three months ended September 30, 2017 were $111.3 million compared to $111.6 million for the three months ended September 30, 2016, representing a decrease of $0.3 million, or 0.3%. As a percentage of revenue, staff costs decreased from 63.0% in 2016 to 57.4% in 2017. The decrease in staff costs and as a percentage of revenue was primarily driven by revenue growth as well as savings pertaining to headcount action taken in prior periods.

Deferred acquisition consideration expense in the Global Integrated Agencies reportable segment for the three months ended September 30, 2017 was $1.9 million compared to $15.9 million for the three months ended September 30, 2016, representing a decrease of $14.0 million, or 88.0%. The decrease in expense was primarily due to the increased estimated liability in the prior period driven by the decrease in the Company’s estimated future stock price, pertaining to an equity funded acquisition.

Domestic Creative Agencies

Revenue in the Domestic Creative Agencies reportable segment was $24.2 million for the three months ended September 30, 2017 compared to revenue of $22.2 million for the three months ended September 30, 2016, representing an increase of $2.0 million, or 9.0%. The change in revenue is due to revenue growth from existing Partner Firms of $1.9 million, or 8.6% and a positive foreign exchange impact of $0.1 million, or 0.4%.

The change in expenses as a percentage of revenue in the Domestic Creative Agencies reportable segment for the three months ended September 30, 2017 and 2016 was as follows:

	2017				2016				Change
Domestic Creative Agencies	$		% of Revenue		$		% of Revenue		$		%
	(Dollars in Millions)
Revenue	$	24.2			$	22.2			$	2.0	9.0	%
Operating expenses
Cost of services sold	13.4		55.4	%	12.5		56.2	%	0.9		7.4	%
Office and general expenses	4.7		19.5	%	4.7		21.0	%	0.1		1.2	%
Depreciation and amortization	0.3		1.4	%	0.4		1.6	%	—		(4.3	)%
	$	18.5	76.4	%	$	17.5	78.9	%	$	1.0	5.5	%
Operating profit	$	5.7	23.6	%	$	4.7	21.1	%	$	1.0	21.9	%

Operating profit in the Domestic Creative Agencies reportable segment for the three months ended September 30, 2017 was $5.7 million compared to $4.7 million for the three months ended September 30, 2016, representing an increase of $1.0 million, or 21.9%. Operating margins improved by 250 basis points from 21.1% in 2016 to 23.6% in 2017. The increase in operating profit and margin was due to increased revenue growth as well as improved staff cost as a percentage of revenue.

The change in the categories of expenses as a percentage of revenue in the Domestic Creative Agencies reportable segment for the three months ended September 30, 2017 and 2016 was as follows:

	2017				2016					Change
Domestic Creative Agencies	$		% of Revenue		$			% of Revenue		$			%
	(Dollars in Millions)
Direct costs (1)	$	0.6	2.4	%	$	0.5		2.4	%	$	—		7.7	%
Staff costs (2)	14.7		60.7	%	13.7			61.9	%	0.9			6.8	%
Administrative	2.7		11.1	%	3.0			13.4	%	(0.3		)	(9.5	)%
Deferred acquisition consideration	—		—	%	(0.3		)	(1.2	)%	0.3			(100.0	)%
Stock-based compensation	0.2		0.7	%	0.2			0.7	%	—			18.0	%
Depreciation and amortization	0.3		1.4	%	0.4			1.6	%	—			(4.3	)%
Total operating expenses	$	18.5	76.4	%	$	17.5		78.9	%	$	1.0		5.5	%

(1) Excludes staff costs.

(2) Excludes stock-based compensation and is comprised of amounts reported in both cost of services and office and general expenses.

36

Staff costs in the Domestic Creative Agencies reportable segment for the three months ended September 30, 2017 were $14.7 million compared to $13.7 million for the three months ended September 30, 2016, representing an increase of $0.9 million, or 6.8%. As a percentage of revenue, staff costs decreased from 61.9% in 2016 to 60.7% in 2017. As a percentage of revenue, staff costs decreased due to better leverage of headcount in support of revenue growth.

Specialist Communications

Revenue in the Specialist Communications reportable segment was $40.7 million for the three months ended September 30, 2017 compared to revenue of $40.3 million for the three months ended September 30, 2016, representing an increase of $0.4 million, or 0.9%. The change in revenue is due to revenue growth from Partner Firms of $0.3 million, or 0.6% and a positive foreign exchange impact of $0.1 million, or 0.3%.

The change in expenses as a percentage of revenue in the Specialist Communications reportable segment for the three months ended September 30, 2017 and 2016 was as follows:

	2017				2016				Change
Specialist Communications	$		% of Revenue		$		% of Revenue		$			%
	(Dollars in Millions)
Revenue	$	40.7			$	40.3			$	0.4		0.9	%
Operating expenses
Cost of services sold	26.6		65.4	%	27.6		68.4	%	(1.0		)	(3.6	)%
Office and general expenses	8.1		19.9	%	1.4		3.6	%	6.7			464.7	%
Depreciation and amortization	1.2		3.0	%	0.2		0.5	%	1.0			549.5	%
	$	35.9	88.3	%	$	29.2	72.5	%	$	6.7		22.9	%
Operating profit	$	4.8	11.7	%	$	11.1	27.5	%	$	(6.3	)	(57.0	)%

Operating profit in the Specialist Communications reportable segment for the three months ended September 30, 2017 was $4.8 million compared to $11.1 million for the three months ended September 30, 2016, representing a decrease of $6.3 million, or 57.0%. Operating margins declined from 27.5% in 2016 to 11.7% in 2017. The decrease in operating profit and margin was primarily due to the change in the deferred acquisition consideration adjustment.

The change in the categories of expenses as a percentage of revenue in the Specialist Communications reportable segment for the three months ended September 30, 2017 and 2016 was as follows:

	2017				2016					Change
Specialist Communications	$		% of Revenue		$			% of Revenue		$			%
	(Dollars in Millions)
Direct costs (1)	$	8.9	21.9	%	$	9.5		23.6	%	$	(0.6	)	(6.1	)%
Staff costs (2)	19.7		48.3	%	19.3			47.9	%	0.4			1.9	%
Administrative	5.3		13.0	%	5.5			13.8	%	(0.3		)	(4.6	)%
Deferred acquisition consideration	0.1		0.3	%	(5.9		)	(14.6	)%	6.0			(102.3	)%
Stock-based compensation	0.7		1.6	%	0.6			1.4	%	0.1			16.6	%
Depreciation and amortization	1.2		3.0	%	0.2			0.5	%	1.0			549.5	%
Total operating expenses	$	35.9	88.3	%	$	29.2		72.5	%	$	6.7		22.9	%

(1) Excludes staff costs.

(2) Excludes stock-based compensation and is comprised of amounts reported in both cost of services and office and general expenses.

Deferred acquisition consideration in the Specialist Communications reportable segment for the three months ended September 30, 2017 was an expense of $0.1 million compared to income of $5.9 million for the three months ended September 30, 2016, representing a change of $6.0 million, or 102.3%. The change in the deferred acquisition consideration adjustment was due to the aggregate under-performance of certain Partner Firms in 2016 as compared to forecasted expectations.

37

Media Services

Revenue in the Media Services reportable segment was $33.0 million for the three months ended September 30, 2017 compared to revenue of $34.5 million for the three months ended September 30, 2016, representing a decrease of $1.5 million, or 4.2%. The change in revenue was due to a negative impact from disposition of $1.2 million, or 3.6%, as well as revenue decline from our existing Partner Firms of $0.3 million, or 0.7%.

The change in expenses as a percentage of revenue in the Media Services reportable segment for the three months ended September 30, 2017 and 2016 was as follows:

	2017				2016				Change
Media Services	$		% of Revenue		$		% of Revenue		$			%
	(Dollars in Millions)
Revenue	$	33.0			$	34.5			$	(1.5	)	(4.2	)%
Operating expenses
Cost of services sold	21.7		65.6	%	24.8		72.0	%	(3.2		)	(12.7	)%
Office and general expenses	8.0		24.3	%	6.9		19.9	%	1.2			17.0	%
Depreciation and amortization	0.9		2.8	%	2.3		6.8	%	(1.4		)	(60.8	)%
	$	30.6	92.7	%	$	34.0	98.6	%	$	(3.4	)	(10.0	)%
Operating profit	$	2.4	7.3	%	$	0.5	1.4	%	$	2.0		418.6	%

Operating profit in the Media Services reportable segment for the three months ended September 30, 2017 was $2.4 million compared to $0.5 million for the three months ended September 30, 2016, representing an increase of $2.0 million, or 418.6%. Operating margins improved by 590 basis points from 1.4% in 2016 to 7.3% in 2017. The increase in operating profit and margin was due to decreased administrative costs and depreciation and amortization, partially offset by a decline in revenue.

The change in the categories of expenses as a percentage of revenue in the Media Services reportable segment for the three months ended September 30, 2017 and 2016 was as follows:

	2017				2016				Change
Media Services	$		% of Revenue		$		% of Revenue		$			%
	(Dollars in Millions)
Direct costs (1)	$	8.3	25.1	%	$	7.9	22.9	%	$	0.4		5.1	%
Staff costs (2)	16.8		50.9	%	17.2		50.0	%	(0.4		)	(2.4	)%
Administrative	4.3		13.0	%	6.3		18.3	%	(2.0		)	(31.8	)%
Deferred acquisition consideration	0.1		0.3	%	0.2		0.5	%	(0.1		)	(31.5	)%
Stock-based compensation	0.2		0.5	%	0.1		0.2	%	0.1			111.3	%
Depreciation and amortization	0.9		2.8	%	2.3		6.8	%	(1.4		)	(60.8	)%
Total operating expenses	$	30.6	92.7	%	$	34.0	98.6	%	$	(3.4	)	(10.0	)%

(1) Excludes staff costs.

(2) Excludes stock-based compensation and is comprised of amounts reported in both cost of services and office and general expenses.

Administrative costs in the Media Services reportable segment for the three months ended September 30, 2017 were $4.3 million compared to $6.3 million for the three months ended September 30, 2016, representing a decrease of $2.0 million, or 31.8%. The decrease in administrative costs was due to a decrease in outside professional services fees as well as occupancy cost savings realized from real estate consolidation initiatives.

Depreciation and amortization expense in the Media Services reportable segment for the three months ended September 30, 2017 was $0.9 million compared to $2.3 million for the three months ended September 30, 2016, representing a decrease of $1.4 million, or 60.8%. The decrease was primarily due to lower amortization from intangibles related to prior period acquisitions.

38

All Other

Revenue in the All Other category was $84.0 million for the three months ended September 30, 2017 compared to revenue of $75.0 million for the three months ended September 30, 2016, representing an increase of $8.9 million, or 11.9%. The change in revenue is due to revenue growth from existing Partner Firms of $8.2 million, or 11.1%, and a positive foreign exchange impact of $0.8 million, or 1.1%, partially offset by a negative impact from dispositions of $0.1 million, or 0.2%.

The change in expenses as a percentage of revenue in the All Other category for the three months ended September 30, 2017 and 2016 was as follows:

	2017				2016					Change
All Other	$		% of Revenue		$			% of Revenue		$			%
	(Dollars in Millions)
Revenue	$	84.0			$	75.0				$	8.9		11.9	%
Operating expenses
Cost of services sold	59.0		70.2	%	51.8			69.0	%	7.2			13.8	%
Office and general expenses	7.6		9.1	%	14.4			19.1	%	(6.8		)	(47.0	)%
Depreciation and amortization	2.2		2.6	%	2.1			2.7	%	0.1			5.1	%
Goodwill impairment	—		—	%	29.6			39.5	%	(29.6		)	(100.0	)%
	$	68.7	81.9	%	$	97.8		130.4	%	$	(29.1	)	(29.7	)%
Operating profit (loss)	$	15.2	18.1	%	$	(22.8	)	(30.4	)%	$	38.0		(166.6	)%

Operating profit in the All Other category for the three months ended September 30, 2017 was $15.2 million compared to a loss of $22.8 million for the three months ended September 30, 2016, representing an increase of $38.0 million. Operating margins improved from a loss margin of 30.4% in 2016 to a profit margin of 18.1% in 2017. The increase in operating profit and margin was largely due to a goodwill impairment recognized in 2016 and a change in the deferred acquisition consideration adjustment, partially offset by an increase in staff costs.

The change in the categories of expenses as a percentage of revenue in the All Other category for the three months ended September 30, 2017 and 2016 was as follows:

	2017					2016				Change
All Other	$			% of Revenue		$		% of Revenue		$			%
	(Dollars in Thousands)
Direct costs (1)	$	20.5		24.5	%	$	19.9	26.5	%	$	0.7		3.4	%
Staff costs (2)	41.7			49.7	%	36.1		48.2	%	5.6			15.4	%
Administrative	7.9			9.4	%	7.9		10.5	%	(0.1		)	(0.7	)%
Deferred acquisition consideration	(4.6		)	(5.5	)%	1.3		1.7	%	(5.9		)	(459.1	)%
Stock-based compensation	1.1			1.3	%	1.0		1.3	%	0.1			13.5	%
Depreciation and amortization	2.2			2.6	%	2.1		2.7	%	0.1			5.1	%
Goodwill impairment	—			—	%	29.6		39.5	%	(29.6		)	(100.0	)%
Total operating expenses	$	68.7		81.9	%	$	97.8	130.4	%	$	(29.1	)	(29.7	)%

(1) Excludes staff costs.

(2) Excludes stock-based compensation and is comprised of amounts reported in both cost of services and office and general expenses.

Goodwill impairment in the All Other category for the three months ended September 30, 2016 was $29.6 million, which was comprised of a partial impairment of goodwill of $27.9 million relating to an experiential reporting unit and a partial impairment of goodwill of $1.7 million relating to a non-material reporting unit. No such goodwill impairment was recognized during the three months ended September 30, 2017.

Deferred acquisition consideration in the All Other category for the three months ended September 30, 2017 was income of $4.6 million compared to an expense of $1.3 million for the three months ended September 30, 2016, representing a change of

39

$5.9 million. The change was primarily due to aggregate under performance of certain Partner Firms as compared to forecasted expectations in the current period.

Staff costs in the All Other category for the three months ended September 30, 2017 were $41.7 million compared to $36.1 million for the three months ended September 30, 2016, representing an increase of $5.6 million, or 15.4%. As a percentage of revenue, staff costs increased from 48.2% in 2016 to 49.7% in 2017. The increase in staff costs was primarily due to higher headcount at certain Partner Firms to support growth of their business.

Corporate

The change in operating expenses for Corporate for the three months ended September 30, 2017 and 2016 was as follows:

	2017		2016		Variance
Corporate	$		$		$			%
	(Dollars in Millions)
Staff costs (1)	$	5.4	$	6.0	$	(0.6	)	(9.2	)%
Administrative	4.6		0.1		4.5			4,016.2	%
Stock-based compensation	0.5		0.6		(0.1		)	(21.0	)%
Depreciation and amortization	0.3		0.4		(0.1		)	(29.0	)%
Total operating expenses	$	10.7	$	7.1	$	3.7		52.1	%

(1) Excludes stock-based compensation.

Total operating expenses for Corporate for the three months ended September 30, 2017 were $10.7 million compared to $7.1 million for the three months ended September 30, 2016, representing an increase of $3.7 million, or 52.1%.

Staff costs for Corporate for the three months ended September 30, 2017 were $5.4 million compared to $6.0 million for the three months ended September 30, 2016, representing a decrease of $0.6 million, or 9.2%.

Administrative costs for Corporate for the three months ended September 30, 2017 were $4.6 million compared to $0.1 million for the three months ended September 30, 2016, representing an increase of $4.5 million. This increase was primarily related to insurance proceeds of $3.2 million received by the Company in the prior period relating to the class action litigation and the completed SEC investigation, and an increase in professional fees of $1.3 million, inclusive of fees related to the implementation of ASC 606, Revenue from Contracts with Customers, which is effective January 1, 2018. These incremental items were offset by a reduction in current staff and administrative costs.

Other, Net

Other, net, for the three months ended September 30, 2017 was income of $8.6 million compared to an expense of $6.0 million for the three months ended September 30, 2016, representing an increase in income of $14.6 million. The increase was primarily related to an unrealized foreign exchange gain of $9.9 million in 2017 compared to an unrealized foreign exchange loss of $5.9 million in 2016. The foreign exchange gain in 2017 primarily relates to U.S. dollar denominated indebtedness that is an obligation of our Canadian parent company and was driven by the depreciation of the U.S. dollar against the Canadian dollar in the period.

Interest Expense and Finance Charges, Net

Interest expense and finance charges, net, for the three months ended September 30, 2017 was $16.3 million compared to $16.3 million for the three months ended September 30, 2016, representing a decrease of $0.1 million. The decrease was primarily due to lower incremental borrowings under the Company’s revolving Credit Agreement in comparison to the prior period. See Note 6 for additional information on the Wells Fargo Credit Agreement.

Income Tax Expense (Benefit)

Income tax expense for the three months ended September 30, 2017 was $9.0 million compared to a benefit of $1.9 million for the three months ended September 30, 2016, representing an expense increase of $10.9 million. This increase in expense was attributable to the tax exposure of certain jurisdictions as the Company’s businesses were in a profitable position in comparison to the prior period. In addition, for both periods the Company’s effective tax rate was impacted by losses in certain tax jurisdictions where a valuation allowance was deemed necessary.

Equity in Earnings of Non-Consolidated Affiliates

Equity in earnings of non-consolidated affiliates represents the income attributable to equity-accounted affiliate operations. The Company recorded income of $1.4 million for the three months ended September 30, 2017 compared to income of $0.1 million for the three months ended September 30, 2016, representing an increase of $1.3 million.

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Noncontrolling Interests

The effect of noncontrolling interests for the three months ended September 30, 2017 was $3.5 million compared to $1.1 million for the three months ended September 30, 2016, representing an increase of $2.4 million. This increase was attributable to the noncontrolling interests of certain Partner Firms that attained the right to distribution of earnings in the current period.

Net Income (Loss) Attributable to MDC Partners Inc. Common Shareholders

As a result of the foregoing, net income attributable to MDC Partners Inc. common shareholders for the three months ended September 30, 2017 was $16.5 million, or $0.24 per diluted share, compared to net loss attributable to MDC Partners Inc. common shareholders of $32.1 million, or $0.62 per diluted share, for the three months ended September 30, 2016.

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Nine Months EndedSeptember 30, 2017 Compared to Nine Months EndedSeptember 30, 2016

Revenue was $1.1 billion for the nine months ended September 30, 2017 compared to revenue of $1.0 billion for the nine months ended September 30, 2016, representing an increase of $115.7 million, or 11.6%. The change in revenue was driven by revenue growth from existing Partner Firms of $78.7 million, or 7.9%, partially offset by a negative foreign exchange impact of $2.0 million, or 0.2%. Revenue from acquired Partner Firms was $43.5 million, or 4.4%, partially offset by a negative impact from dispositions of $4.5 million, or 0.5%.

Operating profit for the nine months ended September 30, 2017 was $72.0 million compared to operating profit of $21.9 million for the nine months ended September 30, 2016, representing an increase of $50.1 million. The increase in operating profit was primarily driven by an increase in operating profit in the Advertising and Communications Group of $46.1 million as well as a decrease of Corporate operating expenses of $4.0 million.

Net income was $25.8 million for the nine months ended September 30, 2017 compared to a net loss of $51.8 million for the nine months ended September 30, 2016. The increase in net income of $77.5 million was primarily due to an increase in operating profit of $50.1 million, a loss on redemption of notes of $33.3 million recognized in 2016, and an increase in foreign exchange gain of $8.9 million, partially offset by an increase in tax expense of $16.5 million.

Advertising and Communications Group

The following discussion provides additional detailed disclosure for each of the Company’s four (4) reportable segments, plus “All Other,” within the Advertising and Communications Group.

Revenue in the Advertising and Communications Group was $1.1 billion for the nine months ended September 30, 2017 compared to revenue of $1.0 billion for the nine months ended September 30, 2016, representing an increase of $115.7 million, or 11.6%. The change in revenue was driven by revenue growth from existing Partner Firms of $78.7 million, or 7.9%, partially offset by a negative foreign exchange impact of $2.0 million, or 0.2%. Revenue from acquired Partner Firms was $43.5 million, or 4.4%, partially offset by a negative impact from dispositions of $4.5 million, or 0.5%. Revenue growth was attributable to net new client wins, increased spending as well as expanded scopes of services by existing clients, and increased pass-through costs. There was broad based growth by client sector, with particular strength in communications, food & beverage, financials, and consumer products, partially offset by a decline in technology.

Revenue growth was driven by the Company’s business in the United States with growth of $69.2 million, or 8.6% due to new business wins, increased spending as well as expanded scopes of services by existing clients, and increased pass-through costs. In Canada, revenue declined $3.8 million, or 4.1%, mostly due to lower pass-through costs. Outside of the North American region, revenue growth was $50.3 million, or 48.7%, primarily consisting of contributions from acquired Partner Firms of $43.5 million, or 42.1%, partially offset by a negative impact from dispositions of $1.8 million, or 1.7%. Revenue contributions from existing Partner Firms consisted of revenue growth of $11.2 million, or 10.8%, due to new business wins, increased spending, and higher pass-through costs, partially offset by a negative impact from foreign exchange of $2.6 million, or 2.5%.

The Company also utilizes non-GAAP metrics called organic revenue growth (decline) and non-GAAP acquisitions (dispositions), net, as defined in Item 2. For the nine months ended September 30, 2017, organic revenue growth was $83.6 million, or 8.4%, of which $78.6 million pertained to Partner Firms which the Company has held throughout each of the comparable periods presented, with the remaining $4.9 million generated through acquired Partner Firms. The other components of non-GAAP activity include non-GAAP acquisition (disposition), net adjustments of $36.5 million, or 3.7%, and a negative foreign exchange impact of $4.4 million, or 0.4%.

The components of the change in revenues by geography in the Advertising and Communications Group for the nine months ended September 30, 2017 are as follows:

			2017 Non-GAAP Activity											Change
Advertising and Communications Group	2016 Revenue		Foreign Exchange			Non-GAAP Acquisitions (Dispositions), net			Organic Revenue Growth (Decline)			2017 Revenue		Foreign Exchange		Non-GAAP Acquisitions (Dispositions), net		Organic Revenue Growth (Decline)		Total Revenue
	(Dollars in Millions)
United States	$	799.7	$	—		$	(1.2	)	$	70.4		$	868.8	—	%	(0.2	)%	8.8	%	8.6	%
Canada	92.3		0.7			(1.5		)	(2.9		)	88.5		0.7	%	(1.6	)%	(3.2	)%	(4.1	)%
Other	103.4		(5.0		)	39.2			16.1			153.7		(4.9	)%	37.9	%	15.6	%	48.7	%
Total	$	995.3	$	(4.4	)	$	36.5		$	83.6		$	1,111.0	(0.4	)%	3.7	%	8.4	%	11.6	%

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The below is a reconciliation between the Acquisitions (Dispositions), net to revenue from acquired businesses in the statement of operations for the nine months ended September 30, 2017:

	Global Integrated Agencies			Media Services			All Other			Total
	(Dollars in Millions)
GAAP revenue from 2016 acquisitions (1)	$	43.5		$	—		$	—		$	43.5
Foreign exchange impact	2.4			—			—			2.4
Contribution to organic revenue (growth) decline (2)	(4.9		)	—			—			(4.9		)
Prior year revenue from dispositions	(1.8		)	(1.2		)	(1.5		)	(4.5		)
Non-GAAP acquisitions (dispositions), net	$	39.2		$	(1.2	)	$	(1.5	)	$	36.5

(1) Operating segments not impacted by revenue from acquired Partner Firms in the current and prior period were excluded. In addition, no acquisitions were completed during 2017. Refer to Note 4 of the Notes to Unaudited Condensed Consolidated Financial Statements included herein for further information pertaining to the current year dispositions.

(2) Contributions to organic revenue growth (decline) represents the change in revenue, measured on a constant currency basis, relative to the comparable pre-acquisition period for acquired businesses that is included in the Company’s organic revenue growth (decline) calculation.

The geographic mix in revenues in the Advertising and Communications Group for the nine months ended September 30, 2017 and 2016 are as follows:

	2017		2016
United States	78.2	%	80.3	%
Canada	8.0	%	9.3	%
Other	13.8	%	10.4	%

Organic revenue growth in the Advertising and Communications Group was driven by the Company’s business in the United States with growth of $70.4 million, or 8.8%, due to new business wins, increased spending as well as expanded scopes of services by existing clients, and higher pass-through costs. In Canada, organic revenue declined $2.9 million, or 3.2%, due to a decrease in pass-through costs. Organic revenue growth from outside of North America was $16.1 million, or 15.6%, consisting of $4.9 million from acquired Partner Firms in addition to contributions from positive net new business from existing Partner Firms.

The adverse foreign exchange impact of $4.4 million, or 0.4%, was primarily due to the weakening of the British Pound and the Swedish Króna against the U.S. dollar.

The change in expenses as a percentage of revenue in the Advertising and Communications Group for the nine months ended September 30, 2017 and 2016 was as follows:

	2017				2016				Change
Advertising and Communications Group	$		% of Revenue		$		% of Revenue		$			%
	(Dollars in Millions)
Revenue	$	1,111.0			$	995.3			$	115.7		11.6	%
Operating Expenses
Cost of services sold	754.8		67.9	%	675.9		67.9	%	78.9			11.7	%
Office and general expenses	223.2		20.1	%	202.1		20.3	%	21.1			10.4	%
Depreciation and amortization	32.1		2.9	%	32.8		3.3	%	(0.8		)	(2.3	)%
Goodwill impairment	—		—	%	29.6		3.0	%	(29.6		)	(100.0	)%
	$	1,010.0	90.9	%	$	940.5	94.5	%	$	69.6		7.4	%
Operating profit	$	101.0	9.1	%	$	54.8	5.5	%	$	46.1		84.1	%

Operating profit in the Advertising and Communications Group for the nine months ended September 30, 2017 was $101.0 million compared to $54.8 million for the nine months ended September 30, 2016, representing an increase of $46.1 million, or 84.1%. Operating margins improved by 360 basis points from 5.5% in 2016 to 9.1% in 2017. The increase in operating profit and

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margin was largely due to a goodwill impairment of $29.6 million recognized in 2016, a decrease in staff costs as a percentage of revenue, and a reduction deferred acquisition consideration, partially offset by an increase in direct costs.

The change in the categories of expenses as a percentage of revenue in the Advertising and Communications Group for the nine months ended September 30, 2017 and 2016 was as follows:

	2017				2016				Change
Advertising and Communications Group	$		% of Revenue		$		% of Revenue		$			%
	(Dollars in Millions)
Direct costs (1)	$	192.8	17.3	%	$	146.2	14.7	%	$	46.5		31.8	%
Staff costs (2)	615.8		55.4	%	572.0		57.5	%	43.8			7.7	%
Administrative	140.9		12.7	%	129.3		13.0	%	11.6			9.0	%
Deferred acquisition consideration	13.3		1.2	%	17.2		1.7	%	(3.9		)	(22.7	)%
Stock-based compensation	15.3		1.4	%	13.4		1.3	%	1.9			14.1	%
Depreciation and amortization	32.1		2.9	%	32.8		3.3	%	(0.8		)	(2.3	)%
Goodwill impairment	—		—	%	29.6		3.0	%	(29.6		)	(100.0	)%
Total operating expenses	$	1,010.0	90.9	%	$	940.5	94.5	%	$	69.6		7.4	%

(1) Excludes staff costs.

(2) Excludes stock-based compensation and is comprised of amounts reported in both cost of services and office and general expenses.

Direct costs in the Advertising and Communications Group for the nine months ended September 30, 2017 were $192.8 million compared to $146.2 million for the nine months ended September 30, 2016, representing an increase of $46.5 million, or 31.8%. As a percentage of revenue, direct costs increased from 14.7% in 2016 to 17.3% in 2017. The increase in direct costs and as a percentage of revenue was primarily due to contributions from an acquired Partner Firm which has a higher direct cost to revenue ratio in addition to an increase in costs incurred on the client’s behalf from some of our existing Partner Firms acting as principal.

Staff costs in the Advertising and Communications Group for the nine months ended September 30, 2017 were $615.8 million compared to $572.0 million for the nine months ended September 30, 2016, representing an increase of $43.8 million, or 7.7%. The increase in staff costs was due to increased headcount driven by certain Partner Firms to support the growth of their businesses as well as additional contributions from acquired Parter Firms. As a percentage of revenue, staff costs decreased from 57.5% in 2016 to 55.4% in 2017. The decrease in staff costs was primarily driven by revenue growth as well as savings pertaining to headcount action taken in prior periods.

Administrative costs in the Advertising and Communications Group for the nine months ended September 30, 2017 were $140.9 million compared to $129.3 million, representing an increase of $11.6 million, or 9.0%. The increase was primarily due to increases in occupancy costs incurred to support the growth and expansion of certain Partner Firms and contributions from acquired Partner Firms, partially offset by occupancy cost savings realized from real estate consolidation initiatives at other Partner Firms. As a percentage of revenue, administrative costs were 13.0% in 2016 compared to 12.7% in 2017.

Goodwill impairment in the Advertising and Communications Group for the nine months ended September 30, 2016 was $29.6 million, which was comprised of a partial impairment of goodwill of $27.9 million relating to an experiential reporting unit and a partial impairment of goodwill of $1.7 million relating to a non-material reporting unit. No such goodwill impairment was recognized during the nine months ended September 30, 2017.

Deferred acquisition consideration in the Advertising and Communications Group was an expense of $13.3 million for the nine months ended September 30, 2017 compared to expense of $17.2 million for the nine months ended September 30, 2016, representing a decrease of $3.9 million, or 22.7%. The decrease in the deferred acquisition consideration expense pertained to the increased estimated liability in the prior period driven by the decrease in the Company’s stock price pertaining to an acquired Partner Firm in which the Company used its equity as purchase consideration, partially offset by the finalization of future payments pertaining to an acquisition completed in 2016 and increased expenses pertaining to amendments to purchase agreements of previously acquired incremental ownership interest entered into during 2017.

Stock-based compensation in the Advertising and Communications Group was $15.3 million for the nine months ended September 30, 2017 compared to $13.4 million for the nine months ended September 30, 2016, representing an increase of $1.9 million, or 14.1%. As a percentage of revenue, stock-based compensation remained consistent at approximately 1.4%.

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Depreciation and amortization expense in the Advertising and Communications Group for the nine months ended September 30, 2017 was $32.1 million compared to $32.8 million for the nine months ended September 30, 2016, representing a decrease of $0.8 million, or 2.3%. The decrease was primarily due to lower amortization from intangibles related to prior period acquisitions.

Global Integrated Agencies

Revenue in the Global Integrated Agencies reportable segment was $576.9 million for the nine months ended September 30, 2017 compared to revenue of $489.9 million for the nine months ended September 30, 2016, representing an increase of $87.1 million, or 17.8%. The change in revenue included revenue from acquired Partner Firms of $43.5 million, or 8.9%, partially offset by a negative impact from dispositions of $1.7 million, or 0.4%. Revenue contributions from existing Partner Firms consisted of revenue growth of $46.8 million, or 9.6%, partially offset by a negative foreign exchange impact of $1.5 million, or 0.3%. Revenue growth was primarily due to new business wins, increased spending as well as expanded scopes of services by existing clients, and increased pass-through costs.

The change in expenses as a percentage of revenue in the Global Integrated Agencies reportable segment for the nine months ended September 30, 2017 and 2016 was as follows:

	2017				2016				Change
Global Integrated Agencies	$		% of Revenue		$		% of Revenue		$		%
	(Dollars in Millions)
Revenue	$	576.9			$	489.9			$	87.1	17.8	%
Operating Expenses
Cost of services sold	403.2		69.9	%	335.8		68.5	%	67.4		20.1	%
Office and general expenses	122.1		21.2	%	114.8		23.4	%	7.3		6.4	%
Depreciation and amortization	17.9		3.1	%	15.0		3.1	%	2.9		19.4	%
	$	543.2	94.1	%	$	465.6	95.0	%	$	77.6	16.7	%
Operating profit	$	33.8	5.9	%	$	24.3	5.0	%	$	9.4	38.9	%

Operating profit in the Global Integrated Agencies reportable segment for the nine months ended September 30, 2017 was $33.8 million compared to $24.3 million for the nine months ended September 30, 2016, representing an increase of $9.4 million, or 38.9%. Operating margins improved by 90 basis points from 5.0% in 2016 to 5.9% in 2017. The increase in operating profit and margin was largely due a smaller deferred acquisition consideration adjustment and improved staff costs as a percentage of revenue, partially offset by increased direct costs.

The change in the categories of expenses as a percentage of revenue in the Global Integrated Agencies reportable segment for the nine months ended September 30, 2017 and 2016 was as follows:

	2017				2016				Change
Global Integrated Agencies	$		% of Revenue		$		% of Revenue		$			%
	(Dollars in Millions)
Direct costs (1)	$	82.9	14.4	%	$	39.9	8.1	%	$	43.0		107.9	%
Staff costs (2)	342.3		59.3	%	315.6		64.4	%	26.7			8.5	%
Administrative	77.8		13.5	%	65.9		13.5	%	11.8			18.0	%
Deferred acquisition consideration	12.4		2.1	%	20.1		4.1	%	(7.7		)	(38.5	)%
Stock-based compensation	9.9		1.7	%	9.0		1.8	%	0.9			9.6	%
Depreciation and amortization	17.9		3.1	%	15.0		3.1	%	2.9			19.4	%
Total operating expenses	$	543.2	94.1	%	$	465.6	95.0	%	$	77.6		16.7	%

(1) Excludes staff costs.

(2) Excludes stock-based compensation and is comprised of amounts reported in both cost of services and office and general expenses.

Direct costs in the Global Integrated Agencies reportable segment for the nine months ended September 30, 2017 were $82.9 million compared to $39.9 million for the nine months ended September 30, 2016, representing an increase of $43.0 million, or 107.9%. As a percentage of revenue, direct costs increased from 8.1% in 2016 to 14.4% in 2017. The increase in direct costs and

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as a percentage of revenue was primarily due to contributions from an acquired Partner Firm which has a higher direct cost to revenue ratio, in addition to an increase in costs incurred on certain clients’ behalf from some of our existing Partner Firms acting as principal.

Staff costs in the Global Integrated Agencies reportable segment for the nine months ended September 30, 2017 were $342.3 million compared to $315.6 million for the nine months ended September 30, 2016, representing an increase of $26.7 million, or 8.5%. The increase in staff costs was due to increased headcount driven by certain Partner Firms to support the growth of their businesses as well as additional contributions from acquired Partner Firms. As a percentage of revenue, staff costs decreased from 64.4% in 2016 to 59.3% in 2017. The decrease in staff costs as a percentage of revenue was primarily driven by revenue growth as well as savings pertaining to headcount action taken in prior periods.

Deferred acquisition consideration in the Global Integrated Agencies reportable segment for the nine months ended September 30, 2017 was an expense of $12.4 million for the nine months ended September 30, 2017 compared to an expense of $20.1 million for the nine months ended September 30, 2016, representing a decrease of $7.7 million, or 38.5%. The decrease in the deferred acquisition consideration expense pertained to the increased estimated liability in the prior period driven by the decrease in the Company’s stock price pertaining to an acquired Partner Firm in which the Company used its equity as purchase consideration, partially offset by the finalization of future payments pertaining to an acquisition completed in 2016 and increased expenses pertaining to amendments to purchase agreements of previously acquired incremental ownership interest entered into during 2017.

Domestic Creative Agencies

Revenue in the Domestic Creative Agencies reportable segment was $67.5 million for the nine months ended September 30, 2017 compared to revenue of $66.3 million for the nine months ended September 30, 2016, representing an increase of $1.2 million, or 1.8%. The change in revenue was due to revenue growth from Partner Firms of $1.1 million, or 1.7% and a positive foreign exchange impact of $0.1 million, or 0.1%.

The change in expenses as a percentage of revenue in the Domestic Creative Agencies reportable segment for the nine months ended September 30, 2017 and 2016 was as follows:

	2017				2016				Change
Domestic Creative Agencies	$		% of Revenue		$		% of Revenue		$			%
	(Dollars in Millions)
Revenue	$	67.5			$	66.3			$	1.2		1.8	%
Operating Expenses
Cost of services sold	38.0		56.3	%	36.3		54.7	%	1.7			4.7	%
Office and general expenses	14.9		22.0	%	14.0		21.1	%	0.9			6.5	%
Depreciation and amortization	1.1		1.6	%	1.3		1.9	%	(0.2		)	(15.9	)%
	$	53.9	79.9	%	$	51.5	77.7	%	$	2.4		4.7	%
Operating profit	$	13.6	20.1	%	$	14.8	22.3	%	$	(1.2	)	(8.2	)%

Operating profit in the Domestic Creative Agencies reportable segment for the nine months ended September 30, 2017 was $13.6 million compared to $14.8 million for the nine months ended September 30, 2016, representing a decrease of $1.2 million, or 8.2%. Operating margins declined by 220 basis points from 22.3% in 2016 to 20.1% in 2017. The decrease in operating profit and margin was largely due to increased staff costs as a percentage of revenue.

The change in the categories of expenses as a percentage of revenue in the Domestic Creative Agencies reportable segment for the nine months ended September 30, 2017 and 2016 was as follows:

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	2017				2016					Change
Domestic Creative Agencies	$		% of Revenue		$			% of Revenue		$			%
	(Dollars in Millions)
Direct costs (1)	$	1.6	2.4	%	$	1.5		2.3	%	$	0.1		7.1	%
Staff costs (2)	42.2		62.6	%	40.2			60.7	%	2.0			5.1	%
Administrative	8.1		12.0	%	8.2			12.4	%	(0.1		)	(1.4	)%
Deferred acquisition consideration	0.4		0.5	%	(0.2		)	(0.3	)%	0.6			(275.1	)%
Stock-based compensation	0.5		0.7	%	0.5			0.7	%	—			3.1	%
Depreciation and amortization	1.1		1.6	%	1.3			1.9	%	(0.2		)	(15.9	)%
Total operating expenses	$	53.9	79.9	%	$	51.5		77.7	%	$	2.4		4.7	%

(1) Excludes staff costs.

(2) Excludes stock-based compensation and is comprised of amounts reported in both cost of services and office and general expenses.

Staff costs in the Domestic Creative Agencies reportable segment for the nine months ended September 30, 2017 were $42.2 million compared to $40.2 million for the nine months ended September 30, 2016, representing an increase of $2.0 million, or 5.1%. As a percentage of revenue, staff costs increased from 60.7% in 2016 to 62.6% in 2017.The increase in staff costs and as a percentage of revenue was primarily due to increases in workforces at certain Partner Firms to support revenue growth and new business wins.

Specialist Communications

Revenue in the Specialist Communications reportable segment was $125.5 million for the nine months ended September 30, 2017 compared to revenue of $123.0 million for the nine months ended September 30, 2016, representing an increase of $2.5 million, or 2.0%, The change in revenue was due to revenue growth from Partner Firms of $2.8 million, or 2.2%, partially offset by a negative foreign exchange impact of $0.3 million, or 0.2%.

The change in expenses as a percentage of revenue in the Specialist Communications reportable segment for the nine months ended September 30, 2017 and 2016 was as follows:

	2017				2016				Change
Specialist Communications	$		% of Revenue		$		% of Revenue		$			%
	(Dollars in Millions)
Revenue	$	125.5			$	123.0			$	2.5		2.0	%
Operating Expenses
Cost of services sold	85.4		68.0	%	84.2		68.5	%	1.1			1.3	%
Office and general expenses	23.0		18.4	%	15.8		12.8	%	7.3			46.1	%
Depreciation and amortization	3.7		2.9	%	5.1		4.2	%	(1.5		)	(28.6	)%
	$	112.1	89.3	%	$	105.1	85.5	%	$	6.9		6.6	%
Operating profit	$	13.4	10.7	%	$	17.9	14.5	%	$	(4.5	)	(24.9	)%

Operating profit in the Specialist Communications reportable segment for the nine months ended September 30, 2017 was $13.4 million compared to $17.9 million for the nine months ended September 30, 2016, representing a decrease of $4.5 million, or 24.9%. Operating margins declined by 380 basis points from 14.5% in 2016 to 10.7% in 2017. The increase in operating profit and margin was largely due to the change in the deferred acquisition consideration adjustment.

The change in the categories of expenses as a percentage of revenue in the Specialist Communications reportable segment for the nine months ended September 30, 2017 and 2016 was as follows:

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	2017				2016					Change
Specialist Communications	$		% of Revenue		$			% of Revenue		$			%
	(Dollars in Millions)
Direct costs (1)	$	29.7	23.7	%	$	28.7		23.4	%	$	1.0		3.3	%
Staff costs (2)	59.8		47.7	%	59.6			48.5	%	0.1			0.2	%
Administrative	16.0		12.8	%	16.0			13.0	%	—			0.2	%
Deferred acquisition consideration	0.6		0.5	%	(5.9		)	(4.8	)%	6.5			(110.2	)%
Stock-based compensation	2.3		1.8	%	1.6			1.3	%	0.7			45.5	%
Depreciation and amortization	3.7		2.9	%	5.1			4.2	%	(1.5		)	(28.6	)%
Total operating expenses	$	112.1	89.3	%	$	105.1		85.5	%	$	6.9		6.6	%

(1) Excludes staff costs.

(2) Excludes stock-based compensation and is comprised of amounts reported in both cost of services and office and general expenses.

Deferred acquisition consideration in the Specialist Communications reportable segment for the nine months ended September 30, 2017 was an expense of $0.6 million for the nine months ended September 30, 2017 compared to income of $5.9 million for the nine months ended September 30, 2016, representing an increase expense of $6.5 million, or 110.2%. The change in the deferred acquisition consideration adjustment was due to the aggregate under-performance of certain Partner Firms in 2016 as compared to forecasted expectations.

Media Services

Revenue in the Media Services reportable segment was $104.0 million for the nine months ended September 30, 2017 compared to revenue of $96.7 million for the nine months ended September 30, 2016, representing an increase of $7.3 million, or 7.5%. The change in revenue was due to revenue growth of $8.5 million, or 8.8% from existing Partner Firms primarily due to new business wins and expanded scopes of services by existing clients, partially offset by a negative disposition impact of $1.2 million, or 1.3%.

The change in expenses as a percentage of revenue in the Media Services reportable segment for the nine months ended September 30, 2017 and 2016 was as follows:

	2017				2016				Change
Media Services	$		% of Revenue		$		% of Revenue		$			%
	(Dollars in Millions)
Revenue	$	104.0			$	96.7			$	7.3		7.5	%
Operating Expenses
Cost of services sold	66.0		63.5	%	70.9		73.4	%	(4.9		)	(7.0	)%
Office and general expenses	26.4		25.4	%	17.8		18.4	%	8.6			48.3	%
Depreciation and amortization	2.9		2.8	%	4.4		4.6	%	(1.5		)	(33.9	)%
	$	95.3	91.7	%	$	93.2	96.4	%	$	2.2		2.3	%
Operating profit	$	8.6	8.3	%	$	3.5	3.6	%	$	5.1		145.5	%

Operating profit in the Media Services reportable segment for the nine months ended September 30, 2017 was $8.6 million compared to $3.5 million for the nine months ended September 30, 2016, representing an increase of $5.1 million, or 145.5%. Operating margins improved by 470 basis points from 3.6% in 2016 to 8.3% in 2017. The increase in operating profit and margin was largely due to revenue growth as well as a decrease in direct cost as a percentage of revenue, partially offset by an increase in staff costs.

The change in the categories of expenses as a percentage of revenue in the Media Services reportable segment for the nine months ended September 30, 2017 and 2016 was as follows:

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	2017				2016				Change
Media Services	$		% of Revenue		$		% of Revenue		$			%
	(Dollars in Millions)
Direct costs (1)	$	24.2	23.3	%	$	23.7	24.5	%	$	0.5		2.2	%
Staff costs (2)	52.3		50.3	%	48.1		49.7	%	4.2			8.8	%
Administrative	15.0		14.5	%	15.9		16.4	%	(0.9		)	(5.4	)%
Deferred acquisition consideration	0.4		0.4	%	0.9		0.9	%	(0.5		)	(52.3	)%
Stock-based compensation	0.5		0.4	%	0.2		0.2	%	0.3			148.1	%
Depreciation and amortization	2.9		2.8	%	4.4		4.6	%	(1.5		)	(33.9	)%
Total operating expenses	$	95.3	91.7	%	$	93.2	96.4	%	$	2.2		2.3	%

(1) Excludes staff costs.

(2) Excludes stock-based compensation and is comprised of amounts reported in both cost of services and office and general expenses.

Staff costs in the Media Services reportable segment for the nine months ended September 30, 2017 were $52.3 million compared to $48.1 million for the nine months ended September 30, 2016, representing an increase of $4.2 million, or 8.8%. As a percentage of revenue, staff costs increased from 49.7% in 2016 to 50.3% in 2017. The increase in staff costs and as a percentage of revenue was due to higher headcount at certain Partner Firms to support the growth of their businesses.

All Other

Revenue in the All Other category was $237.2 million for the nine months ended September 30, 2017 compared to revenue of $219.5 million for the nine months ended September 30, 2016, representing an increase of $17.7 million, or 8.1%. The change in revenue is due to revenue growth from existing Partner Firms of $19.4 million, or 8.8%, partially offset by a foreign exchange impact of $0.2 million, or 0.1% and a negative impact from dispositions of $1.5 million, or 0.7%.

The change in expenses as a percentage of revenue in the All Other category for the nine months ended September 30, 2017 and 2016 was as follows:

	2017				2016					Change
All Other	$		% of Revenue		$			% of Revenue		$			%
	(Dollars in Millions)
Revenue	$	237.2			$	219.5				$	17.7		8.1	%
Operating Expenses
Cost of services sold	162.3		68.4	%	148.7			67.7	%	13.6			9.1	%
Office and general expenses	36.8		15.5	%	39.8			18.1	%	(3.0		)	(7.6	)%
Depreciation and amortization	6.5		2.7	%	7.0			3.2	%	(0.5		)	(6.9	)%
Goodwill impairment	—		—	%	29.6			13.5	%	(29.6		)	(100.0	)%
	$	205.6	86.7	%	$	225.1		102.6	%	$	(19.6	)	(8.7	)%
Operating profit	$	31.6	13.3	%	$	(5.6	)	(2.6	)%	$	37.2		(662.8	)%

Operating profit in the All Other category for the nine months ended September 30, 2017 was $31.6 million compared to a loss of $5.6 million for the nine months ended September 30, 2016, representing an increase of $37.2 million. Operating margin improved from a loss margin of 2.6% in 2016 to a profit margin of 13.3% in 2017. The increase in operating profit and margin was largely due to a goodwill impairment recognized in 2016, partially offset by increased staff costs.

The change in the categories of expenses as a percentage of revenue in the All Other category for the nine months ended September 30, 2017 and 2016 was as follows:

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	2017					2016				Change
All Other	$			% of Revenue		$		% of Revenue		$			%
	(Dollars in Millions)
Direct costs (1)	$	54.3		22.9	%	$	52.4	23.9	%	$	1.9		3.6	%
Staff costs (2)	119.2			50.2	%	108.4		49.4	%	10.7			9.9	%
Administrative	23.9			10.1	%	23.2		10.6	%	0.7			3.1	%
Deferred acquisition consideration	(0.5		)	(0.2	)%	2.3		1.1	%	(2.8		)	(121.1	)%
Stock-based compensation	2.1			0.9	%	2.1		1.0	%	—			1.2	%
Depreciation and amortization	6.5			2.7	%	7.0		3.2	%	(0.5		)	(6.9	)%
Goodwill impairment	—			—	%	29.6		13.5	%	(29.6		)	(100.0	)%
Total operating expenses	$	205.6		86.7	%	$	225.1	102.6	%	$	(19.6	)	(8.7	)%

(1) Excludes staff costs.

(2) Excludes stock-based compensation and is comprised of amounts reported in both cost of services and office and general expenses.

Goodwill impairment in the All Other category for the nine months ended September 30, 2016 was $29.6 million, which was comprised of a partial impairment of goodwill of $27.9 million relating to an experiential reporting unit and a partial impairment of goodwill of $1.7 million relating to a non-material reporting unit. No such goodwill impairment was recognized during the nine months ended September 30, 2017.

Staff costs in the All Other category for the nine months ended September 30, 2017 were $119.2 million compared to $108.4 million for the nine months ended September 30, 2016, representing an increase of $10.7 million, or 9.9%. The increase in staff costs was primarily due to higher headcount at certain Partner Firms to support growth of the business. As a percentage of revenue, staff costs increased from 49.4% in 2016 to 50.2% in 2017.

Corporate

The change in operating expenses for Corporate for the nine months ended September 30, 2017 and 2016 was as follows:

	2017		2016		Variance
Corporate	$		$		$			%
	(Dollars in Millions)
Staff costs (1)	$	15.0	$	20.9	$	(5.9	)	(28.3	)%
Administrative	11.6		8.8		2.8			31.6	%
Stock-based compensation	1.6		2.1		(0.5		)	(22.3	)%
Depreciation and amortization	0.9		1.3		(0.4		)	(31.8	)%
Total operating expenses	$	29.0	$	33.0	$	(4.0	)	(12.1	)%

(1) Excludes stock-based compensation.

Total operating expenses for Corporate for the nine months ended September 30, 2017 were $29.0 million compared to $33.0 million for the nine months ended September 30, 2016, representing a decrease of $4.0 million, or 12.1%.

Staff costs for Corporate for the nine months ended September 30, 2017 were $15.0 million compared to $20.9 million for the nine months ended September 30, 2016, representing a decrease of $5.9 million, or 28.3%. This decrease was due to lower executive compensation expense in 2017.

Administrative costs for Corporate for the nine months ended September 30, 2017 were $11.6 million compared to $8.8 million for the nine months ended September 30, 2016, representing an increase of $2.8 million, or 31.6%. This increase was primarily related to reductions in insurance proceeds of $3.6 million received by the Company in the prior period compared to the current period relating to the class action litigation and the completed SEC investigation, and an increase in professional fees of $1.7 million primarily related to the implementation of ASC 606, Revenue from Contracts with Customers, which is effective January 1, 2018. This was offset partially by reductions in legal fees related to the class action litigation and the completed SEC investigation of $2.5 million.

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Other, Net

Other, net, for the nine months ended September 30, 2017 was income of $17.8 million compared to income of $9.5 million for the nine months ended September 30, 2016, representing an increase of $8.3 million. The increase was primarily related to an unrealized foreign exchange gain of $18.8 million in 2017 compared to an unrealized foreign exchange gain of $9.9 million in 2016. The foreign exchange gains in both 2017 and 2016 primarily related to U.S. dollar denominated indebtedness that is an obligation of our Canadian parent company and was driven by the depreciation of the U.S. dollar against the Canadian dollar in the period.

Interest Expense and Finance Charges, Net

Interest expense and finance charges, net, for the nine months ended September 30, 2017 was $48.3 million compared to $48.7 million for the nine months ended September 30, 2016, representing a decrease of $0.4 million, or 0.8%.

Loss on Redemption of Notes

Loss on redemption of notes decreased by $33.3 million for the nine months ended September 30, 2017 compared to the nine months ended September 30, 2016 due to the loss on redemption of the 6.75% Notes in the first quarter of 2016.

Income Tax Expense

Income tax expense for the nine months ended September 30, 2017 was $17.7 million compared to $1.2 million for the nine months ended September 30, 2016, representing an increase of $16.5 million. This increase in expense was attributable to the tax exposure of certain jurisdictions as the Company’s businesses were in a profitable position in comparison to the prior period. In addition, for both periods the Company’s effective tax rate was impacted by losses in certain tax jurisdictions where a valuation allowance was deemed necessary.

Equity in Earnings of Non-Consolidated Affiliates

Equity in earnings of non-consolidated affiliates represents the income attributable to equity-accounted affiliate operations. For the nine months ended September 30, 2017, the Company recorded income of $1.9 million compared to nil for the nine months ended September 30, 2016.

Noncontrolling Interests

The effects of noncontrolling interests was $6.6 million for the nine months ended September 30, 2017 compared to $3.2 million during the nine months ended September 30, 2016, representing an increase of $3.4 million. This increase was attributable to the noncontrolling interests of certain Partner Firms that attained the right to distribution of earnings in the current period.

Net Income (Loss) Attributable to MDC Partners Inc. Common Shareholders

As a result of the foregoing, net income attributable to MDC Partners Inc. common shareholders for the nine months ended September 30, 2017 was $14.8 million. or $0.24 per diluted share, compared to a net loss of $54.9 million, or $1.08 per diluted share reported for the nine months ended September 30, 2016.

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Liquidity and Capital Resources:

Liquidity

The following table provides summary information about the Company’s liquidity position:

(amounts in $ millions)	As of and for the nine months ended September 30, 2017			As of and for the nine months ended September 30, 2016			As of and for the year ended December 31, 2016
Cash and cash equivalents	$	18.9		$	21.7		$	27.9
Working capital deficit	$	(220.3	)	$	(319.2	)	$	(313.2	)
Cash provided by (used in) operating activities	$	22.1		$	(41.4	)	$	5.4
Cash used in investing activities	$	(19.5	)	$	(14.7	)	$	(25.2	)
Cash provided by (used in) financing activities	$	(11.7	)	$	15.1		$	(15.9	)
Long-term debt to total equity ratio	(2.39		)	(1.83		)	(1.84		)
Ratio of earnings to fixed charges	1.65			N/A			N/A
Fixed charge deficiency	N/A			$	50.5		$	49.6

As of September 30, 2017 and 2016 and December 31, 2016, $5.2 million, $5.3 million, and $5.3 million, respectively, of the Company’s consolidated cash position was held by subsidiaries. This amount does not represent cash that is distributable as earnings to MDC for use to reduce its indebtedness. It is the Company’s intent through its cash management system to reduce any outstanding borrowings under the Credit Agreement by using available cash.

The Company intends to maintain sufficient cash and/or available borrowings to fund operations for the next twelve months.

The Company has historically been able to maintain and expand its business using cash generated from operating activities, funds available under its credit agreement, and other initiatives, such as obtaining additional debt and equity financing. The Company’s obligations extending beyond twelve months primarily consist of deferred acquisition payments, capital expenditures, scheduled lease obligation payments, and interest payments on borrowings under the credit agreement and the Company’s 6.50% Senior Notes due 2024.

Based on the current outlook, the Company believes future cash flows from operations, together with the Company’s existing cash balance and availability of funds under the Company’s credit agreement, will be sufficient to meet the Company’s anticipated cash needs for the foreseeable future. The Company’s ability to make scheduled deferred acquisition payments, principal and interest payments, to refinance indebtedness or to fund planned capital expenditures will depend on future performance, which is subject to general economic conditions, the competitive environment and other factors, including those described in (i) Part II, Item 1A (Risk Factors) in this Quarterly Report on Form 10-Q and (ii) the Company’s 2016 Annual Report on Form 10-K/A under the caption “Risk Factors,” and in the Company’s other SEC filings.

Working Capital Deficit

At September 30, 2017, the Company had a working capital deficit of $220.3 million compared to a deficit of $313.2 million at December 31, 2016. Working capital deficit decreased by $92.9 millionprimarily due to the net proceeds from the issuance of the convertible preference shares and timing of media payments, offset by the net repayments under the credit agreement and payments of deferred acquisition consideration. During the nine months endedSeptember 30, 2016, the Company’s working capital was negatively impacted by increased volatility caused by a shift in seasonality relating to the changing client base in our media business. The Company’s working capital is impacted by seasonality in media buying, amounts spent by clients, and timing of amounts received from clients and subsequently paid to suppliers. Media buying is impacted by the timing of certain events, such as major sporting competitions and national holidays, and there can be a quarter to quarter lag between the time amounts received from clients for the media buying are subsequently paid to suppliers. At September 30, 2017, the Company had $48.6 million of borrowings outstanding under its Credit Agreement. The Company includes amounts due to noncontrolling interest holders, for their share of profits, in accrued and other liabilities. At September 30, 2017, $5.8 million remained outstanding to be distributed to noncontrolling interest holders over the next twelve months.

The Company intends to maintain sufficient cash or availability of funds under the Credit Agreement at any particular time to adequately fund working capital should there be a need to do so from time to time.

Cash Flows

Operating Activities

Cash flows provided by operating activities, including changes in non-cash working capital, for the nine months endedSeptember 30, 2017 was $22.1 million. This was attributable to net income of $25.8 million, an increase in depreciation,

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amortization of intangibles, and stock compensation of $49.8 million, a decrease in advanced billings of $32.0 million, adjustments to deferred acquisition consideration of $13.4 million, a decrease in deferred income taxes of $8.1 million, a decrease in prepaid expenses and other current assets of $6.4 million and amortization of deferred finance charges of $2.0 million, and loss on sale of assets of $1.2 million. This was partially offset by an increase in accounts receivable of $54.7 million, an increase in accounts payable, accruals, and other liabilities of $31.1 million primarily driven by an increase in accrued media and the timing of payments to suppliers, expenditures billable to clients of $9.3 million, foreign exchange of $15.1 million, a net increase in other non-current assets and liabilities of $4.4 million, and earnings of non-consolidated affiliates of $1.9 million.

Cash flows used in operating activities, including changes in non-cash working capital, for the nine months endedSeptember 30, 2016 was $41.4 million. This was attributable to a net loss of $51.8 million, a decrease in accounts payable, accruals, and other liabilities of $77.4 million primarily driven by a decrease in accrued media and the timing of payments to suppliers, an increase in accounts receivable of $47.8 million, an increase in prepaid expenses and other current assets of $16.9 million, foreign exchange of $12.8 million, and deferred income taxes of $0.6 million. This was partially offset by depreciation, amortization of intangibles, and stock compensation of $49.5 million, goodwill impairment of $29.6 million, a loss on the redemption of the 6.75% Notes of $26.9 million, a decrease in advanced billings of $25.8 million, adjustments to deferred acquisition consideration of $17.4 million, amortization of deferred finance charges and debt discount of $8.7 million, a decrease in expenditures billable to clients of $5.6 million, a net decrease in other non-current assets and liabilities of $1.9 million, and a loss on sale of assets of $0.4 million.

Investing Activities

During the nine months endedSeptember 30, 2017, cash flows used in investing activities was $19.5 million, and consisted of capital expenditures related primarily to computer equipment, furniture and fixtures, and leasehold improvements of $28.3 million, of which $17.6 million was incurred by the Global Integrated Agencies segment, $1.5 million for deposits, and $1.5 million for other investments. These outflows were partially offset by net proceeds from the sale of three subsidiaries during the three months ended September 30, 2017 of $11.1 million, and $0.7 million of profit distributions from affiliates.

During the nine months endedSeptember 30, 2016, cash flows used in investing activities was $14.7 million, and consisted of capital expenditures related primarily to computer equipment, furniture and fixtures, and leasehold improvements of $19.7 million, of which $10.7 million was incurred by the Global Integrated Agencies segment, and $2.6 million for other investments. These outflows were partially offset by $4.9 million of profit distributions from affiliates, $0.2 million of net cash acquired through acquisitions, and $2.5 million of proceeds from the sale of assets.

Financing Activities

During the nine months endedSeptember 30, 2017, cash flows used in financing activities was $11.7 million, and consisted of $95.0 million in proceeds from the issuance of convertible preference shares. This inflow was partially offset by $5.8 million in net repayments under the credit agreement, $89.1 million of acquisition related payments, distributions to noncontrolling partners of $5.3 million, $4.6 million of issuance costs paid in connection with the issuance of the convertible preference shares, repayments of long-term debt of $0.3 million, and the purchase of treasury shares for income tax withholding requirements of $1.2 million.

During the nine months endedSeptember 30, 2016, cash flows provided by financing activities was $15.1 million, and consisted of $900.0 million in proceeds from the issuance of the 6.50% Notes and $70.5 million in net borrowings under the credit agreement. These inflows were partially offset by the redemption of the 6.75% Notes of $735.0 million, a premium paid in connection with such redemption of $26.9 million including accrued interest through the settlement date, $21.6 million of debt issuance costs paid in connection with the issuance of the 6.50% Notes, $129.6 million of acquisition related payments, payment of dividends of $32.6 million, distributions to noncontrolling partners of $6.5 million, the purchase of treasury shares for income tax withholding requirements of $2.8 million, and repayments of long-term debt of $0.4 million.

Total Debt

6.50% Notes

On March 23, 2016, MDC entered into an indenture (the “Indenture”) among MDC, its existing and future restricted subsidiaries that guarantee, or are co-borrowers under or grant liens to secure, the Credit Agreement, as guarantors (the “Guarantors”) and The Bank of New York Mellon, as trustee, relating to the issuance by MDC of its $900 million aggregate principal amount of 6.50% senior unsecured notes due 2024. The 6.50% Notes were sold in a private placement in reliance on exceptions from registration under the ’33 Act. The 6.50% Notes bear interest at a rate of 6.50% per annum, accruing from March 23, 2016. Interest is payable semiannually in arrears on May 1 and November 1 of each year, beginning November 1, 2016. The 6.50% Notes mature on May 1, 2024, unless earlier redeemed or repurchased. The Company received net proceeds from the offering of the 6.50% Notes equal to approximately $880,000. The Company used the net proceeds to redeem all of its existing 6.75% Notes, together with accrued interest, related premiums, fees and expenses and recorded a charge for the loss on redemption of such notes of $33,298, including write offs of unamortized original issue premium and debt issuance costs. Remaining proceeds were used for general corporate purposes, including funding of deferred acquisition consideration.

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The 6.50% Notes are guaranteed on a senior unsecured basis by all of MDC’s existing and future restricted subsidiaries that guarantee, or are co-borrowers under or grant liens to secure, the Credit Agreement. The 6.50% Notes are unsecured and unsubordinated obligations of MDC and rank (i) equally in right of payment with all of MDC’s or any Guarantor’s existing and future senior indebtedness, (ii) senior in right of payment to MDC’s or any Guarantor’s existing and future subordinated indebtedness, (iii) effectively subordinated to all of MDC’s or any Guarantor’s existing and future secured indebtedness to the extent of the collateral securing such indebtedness, including the Credit Agreement, and (iv) structurally subordinated to all existing and future liabilities of MDC’s subsidiaries that are not Guarantors.

MDC may, at its option, redeem the 6.50% Notes in whole at any time or in part from time to time, on and after May 1, 2019 (i) at a redemption price of 104.875% of the principal amount thereof if redeemed during the twelve-month period beginning on May 1, 2019, (ii) at a redemption price of 103.250% of the principal amount thereof if redeemed during the twelve-month period beginning on May 1, 2020, (iii) at a redemption price of 101.625% of the principal amount thereof if redeemed during the twelve-month period beginning on May 1, 2021, and (iv) at a redemption price of 100% of the principal amount thereof if redeemed on May 1, 2022 and thereafter.

Prior to May 1, 2019, MDC may, at its option, redeem some or all of the 6.50% Notes at a price equal to 100% of the principal amount of the 6.50% Notes plus a “make whole” premium and accrued and unpaid interest. MDC may also redeem, at its option, prior to May 1, 2019, up to 35% of the 6.50% Notes with the proceeds from one or more equity offerings at a redemption price of 106.50% of the principal amount thereof.

If MDC experiences certain kinds of changes of control (as defined in the Indenture), holders of the 6.50% Notes may require MDC to repurchase any 6.50% Notes held by them at a price equal to 101% of the principal amount of the 6.50% Notes plus accrued and unpaid interest. In addition, if MDC sells assets under certain circumstances, it must apply the proceeds from such sale and offer to repurchase the 6.50% Notes at a price equal to 100% of the principal amount plus accrued and unpaid interest.

The Indenture includes covenants that, among other things, restrict MDC’s ability and the ability of its restricted subsidiaries (as defined in the Indenture) to incur or guarantee additional indebtedness; pay dividends on or redeem or repurchase the capital stock of MDC; make certain types of investments; create restrictions on the payment of dividends or other amounts from MDC’s restricted subsidiaries; sell assets; enter into transactions with affiliates; create liens; enter into sale and leaseback transactions; and consolidate or merge with or into, or sell substantially all of MDC’s assets to, another person. These covenants are subject to a number of important limitations and exceptions. The 6.50% Notes are also subject to customary events of default, including a cross-payment default and cross-acceleration provision.

Redemption of 6.75% Notes

On March 23, 2016, the Company redeemed the 6.75% Notes in whole at a redemption price of 103.375% of the principal amount thereof with the proceeds from the issuance of the 6.50% Notes.

Revolving Credit Agreement

On March 20, 2013, MDC, Maxxcom Inc. (a subsidiary of MDC) and each of their subsidiaries entered into an amended and restated, $225 million senior secured revolving credit agreement due 2018 (the “Credit Agreement”) with Wells Fargo Capital Finance, LLC, as agent, and the lenders from time to time party thereto. Advances under the Credit Agreement will be used for working capital and general corporate purposes, in each case pursuant to the terms of the Credit Agreement. Capitalized terms used in this section and not otherwise defined have the meanings set forth in the Credit Agreement.

Effective October 23, 2014, MDC, Maxxcom Inc. and each of their subsidiaries entered into an amendment of its Credit Agreement. The amendment: (i) expanded the commitments under the facility by $100 million, from $225 million to $325 million; (ii) extended the date by an additional eighteen months to September 30, 2019; (iii) reduced the base borrowing interest rate by 25 basis points (the applicable margin for borrowing is 1.00% in the case of Base Rate Loans and 1.75% in the case of LIBOR Rate Loans) ; and (iv) modified certain covenants to provide the Company with increased flexibility to fund its continued growth and other general corporate purposes.

Effective May 3, 2016, MDC and its subsidiaries entered into an additional amendment to its Credit Agreement. The amendment: (i) extends the date by an additional nineteen months to May 3, 2021; (ii) reduces the base borrowing interest rate by 25 basis points; (iii) provides the Company the ability to borrow in foreign currencies; and (iv) certain other modifications to provide additional flexibility in operating the Company’s business.

Advances under the Credit Agreement bear interest as follows: (a)(i) Non-Prime Rate Loans bear interest at the Non-Prime Rate and (ii) all other Obligations bear interest at the Prime Rate, plus (b) an applicable margin. The applicable margin for borrowing is 1.50% in the case of Non-Prime Rate Loans and Prime Rate Loans that are European Advances, and 1.75% on all other Obligations. In addition to paying interest on outstanding principal under the Credit Agreement, MDC is required to pay an unused revolver fee of 0.25% to lenders under the Credit Agreement in respect of unused commitments thereunder.

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The Credit Agreement is guaranteed by substantially all of MDC’s present and future subsidiaries, other than immaterial subsidiaries and subject to customary exceptions. The Credit Agreement includes covenants that, among other things, restrict MDC’s ability and the ability of its subsidiaries to incur or guarantee additional indebtedness; pay dividends on or redeem or repurchase the capital stock of MDC; make certain types of investments; impose limitations on dividends or other amounts from MDC’s subsidiaries; incur certain liens, sell or otherwise dispose of certain assets; enter into transactions with affiliates; enter into sale and leaseback transactions; and consolidate or merge with or into, or sell substantially all of MDC’s assets to, another person. These covenants are subject to a number of important limitations and exceptions. The Credit Agreement also contains financial covenants, including a total leverage ratio, a senior leverage ratio, a fixed charge coverage ratio and a minimum earnings level (each as more fully described in the Credit Agreement). The Credit Agreement is also subject to customary events of default.

The foregoing descriptions of the Indenture and the Credit Agreement do not purport to be complete and are qualified in their entirety by reference to the full text of the agreements.

Debt, net of debt issuance costs, as of September 30, 2017 was $931.2 million, a decrease of $5.2 million, compared with $936.4 million outstanding at December 31, 2016.  This decrease in debt was primarily a result of the Company’s net repayments of the Credit Agreement. At September 30, 2017, approximately $271.4 million of commitments under the Credit Agreement were undrawn.

The Company is currently in compliance with all of the terms and conditions of the Credit Agreement, and management believes, based on its current financial projections, that the Company will be in compliance with its covenants over the next twelve months.

If the Company loses all or a substantial portion of its lines of credit under the Credit Agreement, or if the Company uses the maximum available amount under the Credit Agreement, it will be required to seek other sources of liquidity. If the Company were unable to find these sources of liquidity, for example through an equity offering or access to the capital markets, the Company’s ability to fund its working capital needs and any contingent obligations with respect to acquisitions and redeemable noncontrolling interests would be adversely affected.

Pursuant to the Credit Agreement, the Company must comply with certain financial covenants including, among other things, covenants for (i) senior leverage ratio, (ii) total leverage ratio, (iii) fixed charges ratio, and (iv) minimum earnings before interest, taxes and depreciation and amortization, in each case as such term is specifically defined in the Credit Agreement. For the period ended September 30, 2017, the Company’s calculation of each of these covenants, and the specific requirements under the Credit Agreement, respectively, were calculated based on the trailing twelve months as follows:

	September 30, 2017
Total Senior Leverage Ratio	0.2
Maximum per covenant	2.0
Total Leverage Ratio	4.8
Maximum per covenant	5.5
Fixed Charges Ratio	2.2
Minimum per covenant	1.0
Earnings before interest, taxes, depreciation and amortization	$	197,686
Minimum per covenant	$	105,000

These ratios and measures are not based on generally accepted accounting principles and are not presented as alternative measures of operating performance or liquidity. Some of these ratios and measures include, among other things, pro forma adjustments for acquisitions, one-time charges, and other items, as defined in the Credit Agreement. They are presented here to demonstrate compliance with the covenants in the Credit Agreement, as non-compliance with such covenants could have a material adverse effect on the Company.

Deferred Acquisition Consideration and Other Balance Sheet Commitments

The Company’s agencies enter into contractual commitments with media providers and agreements with production companies on behalf of our clients at levels that exceed the revenue from services. Some of our agencies purchase media for clients and act as an agent for a disclosed principal. These commitments are included in accounts payable when the media services are delivered by the media providers. MDC takes precautions against default on payment for these services and has historically had a very low

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incidence of default. MDC is still exposed to the risk of significant uncollectible receivables from our clients. The risk of a material loss could significantly increase in periods of severe economic downturn.

Acquisitions of a business, or a majority interest of a business, by the Company may include future additional contingent purchase price obligations payable to the seller, which are recorded as deferred acquisition consideration liabilities on the Company’s balance sheet at the estimated acquisition date fair value and are remeasured at each reporting period. These contingent purchase obligations are generally payable within a one to five-year period following the acquisition date, and are based on achievement of certain thresholds of future earnings and, in certain cases, the rate of growth of those earnings. The actual amount that the Company pays in connection with such contingent purchase obligations may differ materially from this estimate.

In connection with such contingent purchase obligations, the Company may have the option or, in some cases, the requirement, to purchase the remaining interest. Generally, the Company’s option or requirement to purchase the incremental ownership interest coincides with the final payment of the purchase price obligation related to the Company’s initial majority acquisition. If the Company subsequently acquires the remaining incremental ownership interest, the acquisition fair value of the purchase price, net of any cash paid at closing, is recorded as a liability, any noncontrolling interests are removed and any difference between the purchase price and noncontrolling interest is recorded to additional paid-in capital.

The deferred acquisition consideration and redeemable noncontrolling interests are impacted by (i) present value adjustments to accrete the acquisition date fair value of the obligation to the estimated future payment amount at the reporting date, (ii) changes in the estimated future payment obligation resulting from the underlying subsidiary’s financial performance, and (iii) amendments to purchase agreements of previously acquired incremental ownership interests. As it relates to the acquisition of Forsman & Bodenfors AB completed in 2016, the deferred acquisition was impacted by the market performance of the Company’s stock price. Redeemable noncontrolling interests are not adjusted below the related initial redemption value. Significant changes in actual results and metrics, such as profit margins and growth rates among others, relative to expectations would result in a higher or lower redemption value adjustment. In addition, the deferred acquisition consideration and redeemable noncontrolling interests could be materially impacted by future acquisition activity, if any, and the particular structure of such acquisitions.

As a result, and due to the factors noted above, the Company does not have a view of the future trajectory and quantification of potential changes in the deferred acquisition consideration and redeemable noncontrolling interests.

The following table presents the changes in the deferred acquisition consideration by segment for the nine months ended September 30, 2017:

	September 30, 2017
(amounts in $ millions)	Global Integrated Agencies			Domestic Creative Agencies			Specialist Communication Agencies			Media Services			All Other			Total
Beginning Balance of contingent payments	$	148.8		$	0.8		$	15.0		$	7.1		$	53.1		$	224.8
Payments (1)	(72.3		)	(1.1		)	(9.1		)	(2.6		)	(15.4		)	(100.5		)
Additions (2)	—			—			—			—			—			—
Redemption value adjustments (3)	16.3			0.4			1.3			0.4			0.8			19.2
Foreign translation adjustment	0.7			—			—			—			0.7			1.3
Ending Balance of contingent payments	93.4			—			7.3			5.0			39.2			144.8
Fixed payments	2.3			—			0.3			—			0.8			3.4
	$	95.7		$	—		$	7.6		$	5.0		$	40.0		$	148.3

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The following table presents the changes in the deferred acquisition consideration by segment for the year ended December 31, 2016:

	December 31, 2016
(amounts in $ millions)	Global Integrated Agencies			Domestic Creative Agencies			Specialist Communication Agencies			Media Services			All Other			Total
Beginning Balance of contingent payments	$	157.4		$	4.2		$	42.5		$	7.9		$	94.6		$	306.7
Payments (1)	(36.3		)	(3.2		)	(20.5		)	(1.4		)	(43.8		)	(105.2		)
Additions (2)	15.6			—			0.5			—			—			16.1
Redemption value adjustments (3)	16.2			(0.3		)	(3.5		)	0.6			0.9			13.9
Other (4)	(2.4		)	—			(4.1		)	—			—			(6.4		)
Foreign translation adjustment	(1.9		)	—			—			—			1.4			(0.5		)
Ending Balance of contingent payments	148.8			0.8			15.0			7.1			53.1			224.8
Fixed payments	2.9			—			0.6			0.3			1.0			4.8
	$	151.7		$	0.8		$	15.5		$	7.5		$	54.1		$	229.6

(1) For the nine months ended September 30, 2017 and the year ended December 31, 2016, payments include $28.7 million and $10.5 million, respectively, of deferred acquisition consideration settled through the issuance of 3,353,939 and 691,559, respectively, MDC Class A subordinate voting shares in lieu of cash.

(2) Additions are the initial estimated deferred acquisition payments of new acquisitions and step-up transactions completed within that fiscal period.

(3) Redemption value adjustments are fair value changes from the Company’s initial estimates of deferred acquisition payments, including the accretion of present value and stock-based compensation charges relating to acquisition payments that are tied to continued employment.

(4) For the year ended December 31, 2016, other is comprised of (i) $2.4 million transfered to shares to be issued related to 100,000 MDC Class A subordinate voting shares to be issued contingent on specific thresholds of future earnings that management expects to be attained; and (ii) $4.1 million of contingent payments eliminated through the acquisition of incremental ownership interests.

Deferred acquisition consideration excludes future payments with an estimated fair value of $30.7 million that are contingent upon employment terms as well as financial performance and will be expensed as stock-based compensation over the required retention period. Of this amount, the Company estimates $0.3 million will be paid in the current year, $10.4 million will be paid in one to three years, $16.7 million will be paid in three to five years, and $3.3 million will be paid after five years.

Put Rights of Subsidiaries’ Noncontrolling Shareholders

As noted above, noncontrolling shareholders in certain subsidiaries have the right in certain circumstances to require the Company to acquire the remaining ownership interests held by them. The noncontrolling shareholders’ ability to exercise any such option right is subject to the satisfaction of certain conditions, including conditions requiring notice in advance of exercise and specific employment termination conditions. In addition, these rights cannot be exercised prior to specified staggered exercise dates. The exercise of these rights at their earliest contractual date would result in obligations of the Company to fund the related amounts during 2017 to 2023. It is not determinable, at this time, if or when the owners of these rights will exercise all or a portion of these rights.

The amount payable by the Company in the event such contractual rights are exercised is dependent on various valuation formulas and on future events, such as the average earnings of the relevant subsidiary through that date of exercise, the growth rate of the earnings of the relevant subsidiary during that period, and, in some cases, the currency exchange rate at the date of payment.

Management estimates, assuming that the subsidiaries owned by the Company at September 30, 2017, perform over the relevant future periods at their trailing twelve-month earnings level, that these rights, if all are exercised, could require the Company to pay an aggregate amount of approximately $15.5 million to the owners of such rights in future periods to acquire such ownership

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interests in the relevant subsidiaries. Of this amount, the Company is entitled, at its option, to fund approximately $0.2 million by the issuance of share capital.

In addition, the Company is obligated under similar put option rights to pay an aggregate amount of approximately $42.3 million only upon termination of such owner’s employment with the applicable subsidiary or death.

The amount the Company would be required to pay to the holders should the Company acquire the remaining ownership interests is $2.3 million less than the initial redemption value recorded in redeemable noncontrolling interests.

The Company intends to finance the cash portion of these contingent payment obligations using available cash from operations, borrowings under the Credit Agreement (and refinancings thereof), and, if necessary, through the incurrence of additional debt and/or issuance of additional equity. The ultimate amount payable and the incremental operating income in the future relating to these transactions will vary because it is dependent on the future results of operations of the subject businesses and the timing of when these rights are exercised. Approximately $3.3 million of the estimated $15.5 million that the Company would be required to pay subsidiaries noncontrolling shareholders upon the exercise of outstanding contractual rights relates to rights exercisable within the next twelve months. Upon the settlement of the total amount of such options to purchase, the Company estimates that it would receive incremental operating income before depreciation and amortization of $4.1 million.

The following table summarizes the potential timing of the consideration and incremental operating income before depreciation and amortization based on assumptions as described above:

Consideration (4)	2017		2018		2019		2020		2021 & Thereafter		Total
	(Dollars in Millions)
Cash	$	3.3	$	2.8	$	2.6	$	3.5	$	3.1	$	15.3
Shares	—		—		0.1		0.1		—		0.2
	$	3.3	$	2.8	$	2.7	$	3.6	$	3.1	$	15.5	(1)
Operating income before depreciation and amortization to be received (2)	$	2.7	$	0.9	$	—	$	0.5	$	—	$	4.1
Cumulative operating income before depreciation and amortization (3)	$	2.7	$	3.6	$	3.6	$	4.1	$	4.1			(5)

(1) This amount is in addition to (i) the $42.3 million of options to purchase only exercisable upon termination not within the control of the Company, or death, and (ii) the $2.3 million excess of the initial redemption value recorded in redeemable noncontrolling interests over the amount the Company would be required to pay to the holders should the Company acquire the remaining ownership interests.

(2) This financial measure is presented because it is the basis of the calculation used in the underlying agreements relating to the put rights and is based on actual operating results. This amount represents additional amounts to be attributable to MDC Partners Inc., commencing in the year the put is exercised.

(3) Cumulative operating income before depreciation and amortization represents the cumulative amounts to be received by the Company.

(4) The timing of consideration to be paid varies by contract and does not necessarily correspond to the date of the exercise of the put.

(5) Amounts are not presented as they would not be meaningful due to multiple periods included.

Critical Accounting Policies

The following summary of accounting policies has been prepared to assist in better understanding the Company’s consolidated financial statements and the related management discussion and analysis. Readers are encouraged to consider this information together with the Company’s consolidated financial statements and the related Notes to Unaudited Condensed Consolidated Financial Statements as included herein for a more complete understanding of accounting policies discussed below.

Estimates.  The preparation of the Company’s financial statements in conformity with GAAP, requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities (including goodwill, intangible assets, redeemable noncontrolling interests and deferred acquisition consideration), valuation allowances for receivables, deferred income tax assets and stock-based compensation, as well as the reported amounts of revenue and expenses during the reporting period. The statements are evaluated on an ongoing basis and estimates are based on historical experience, current conditions and various other assumptions believed to be reasonable under the circumstances. Actual results can differ from those estimates, and it is possible that the differences could be material.

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Revenue Recognition.  The Company’s revenue recognition policies are as required by the Revenue Recognition topics of the FASB Accounting Standards Codification. The Company earns revenue from agency arrangements in the form of retainer fees or commissions; from short-term project arrangements in the form of fixed fees or per diem fees for services; and from incentives or bonuses. A small portion of the Company’s contractual arrangements with clients includes performance incentive provisions, which allow the Company to earn additional revenues as a result of its performance relative to both quantitative and qualitative goals. The Company records revenue net of sales and other taxes, when persuasive evidence of an arrangement exists, services are provided or upon delivery of the products when ownership and risk of loss has transferred to the customer, the selling price is fixed or determinable and collection of the resulting receivable is reasonably assured.

The Company recognizes the incentive portion of revenue under these arrangements when specific quantitative goals are assured, or when the Company’s clients determine performance against qualitative goals has been achieved. In all circumstances, revenue is only recognized when collection is reasonably assured. The Company records revenue net of sales and other taxes due to be collected and remitted to governmental authorities. In the majority of the Company’s businesses, the Company acts as an agent and records revenue equal to the net amount retained, when the fee or commission is earned. In certain arrangements, the Company acts as principal and contracts directly with suppliers for third party media and production costs. In these arrangements, revenue is recorded at the gross amount billed. Additional information about our revenue recognition policy appears in Note 2 of the Notes to Unaudited Condensed Consolidated Financial Statements included herein.

Business Combinations.  The Company has historically made, and expects to continue to make, selective acquisitions of marketing communications businesses. In making acquisitions, the price paid is determined by various factors, including service offerings, competitive position, reputation and geographic coverage, as well as prior experience and judgment. Due to the nature of advertising, marketing and corporate communications services companies; the companies acquired frequently have significant identifiable intangible assets, which primarily consist of customer relationships. The Company has determined that certain intangibles (trademarks) have an indefinite life, as there are no legal, regulatory, contractual, or economic factors that limit the useful life.

Valuations of acquired companies are based on a number of factors, including specialized know-how, reputation, competitive position and service offerings. Our acquisition strategy has been to focus on acquiring the expertise of an assembled workforce in order to continue building upon the core capabilities of our various strategic business platforms to better serve our clients. Consistent with our acquisition strategy and past practice of acquiring a majority ownership position, most acquisitions include an initial payment at the time of closing and provide for future additional contingent purchase price payments. Contingent purchase price obligations for these transactions are recorded as a liability and are derived from the performance of the acquired entity and are based on predetermined formulas. These various contractual valuation formulas may be dependent on future events, such as the growth rate of the earnings of the relevant subsidiary during the contractual period, and, in some cases, the currency exchange rate on the date of payment. The liability is adjusted quarterly based on changes in current information affecting each subsidiary’s current operating results and the impact this information will have on future results included in the calculation of the estimated liability. In addition, changes in various contractual valuation formulas as well as adjustments to present value impact quarterly adjustments. These adjustments are recorded in results of operations. In addition, certain acquisitions also include options to purchase additional equity ownership interests. The estimated value of these interests are recorded as redeemable noncontrolling interests.

For each of the Company’s acquisitions, a detailed review is undertaken to identify other intangible assets and a valuation is performed for all such identified assets. The Company’s uses several market participant measurements to determine estimated value. This approach includes consideration of similar and recent transactions, as well as utilizing discounted expected cash flow methodologies. Like most service businesses, a substantial portion of the intangible asset value that the Company acquires is the specialized know-how of the workforce, which is treated as part of goodwill and is not required to be valued separately. The majority of the value of the identifiable intangible assets that the Company acquires is derived from customer relationships, including the related customer contracts, as well as trade names. In executing our acquisition strategy, one of the primary drivers in identifying and executing a specific transaction is the existence of, or the ability to, expand our existing client relationships. The expected benefits of our acquisitions are typically shared across multiple agencies and regions.

Acquisitions, Goodwill and Other Intangibles.  The Company reviews goodwill and other indefinite live intangible assets for impairment annually at the beginning of the fourth quarter and whenever events or circumstances indicate that the carrying amount may not be recoverable. For goodwill, impairment is assessed at the reporting unit level.

The Company has the option of assessing qualitative factors to determine whether it is more likely than not that the carrying value of its reporting units exceeds their respective fair value or proceeding directly to the two-step impairment test. If the Company elects to perform a qualitative assessment and concludes it is not more likely than not that the fair value of the reporting unit is less than its carrying value, no further assessment is deemed necessary. Otherwise, goodwill must be tested for impairment by comparing the fair value of a reporting unit with its carrying amount. This process must be applied for any reporting units not included in the qualitative assessment. The Company determines the fair value of a reporting unit using a discounted cash flow

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(“DCF”) analysis. Determining fair value requires the exercise of significant judgment, including judgment about the amount and timing of expected future cash flows and appropriate discount rates.

The expected cash flows used in the DCF analysis are based on the Company’s most recent budget and forecasted growth rates. Assumptions used in the DCF analysis, including the discount rate, are assessed annually based on the reporting units’ current results and forecast, as well as macroeconomic and industry specific factors.

If the estimated fair value of a reporting unit exceeds its carrying value, then the goodwill of the reporting unit is not impaired. Otherwise, the Company will recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value provided the loss recognized does not exceed the total amount of goodwill allocated to that reporting unit.

Redeemable Noncontrolling Interests.  The minority interest shareholders of certain subsidiaries have the right to require the Company to acquire their ownership interest under certain circumstances pursuant to a contractual arrangement and the Company has similar call options under the same contractual terms. The amount of consideration under the put and call rights is not a fixed amount, but rather is dependent upon various valuation formulas and on future events, such as the average earnings of the relevant subsidiary through the date of exercise and the growth rate of the earnings of the relevant subsidiary through the date of exercise.

Allowance for Doubtful Accounts.  Trade receivables are stated less allowance for doubtful accounts. The allowance represents estimated uncollectible receivables usually due to customers’ potential insolvency. The allowance includes amounts for certain customers where risk of default has been specifically identified.

Deferred Taxes.  The Company uses the asset and liability method of accounting for income taxes. Deferred income taxes are provided for the temporary difference between the financial reporting basis and tax basis of the Company’s assets and liabilities. Deferred tax benefits result principally from certain tax carryover benefits and from recording certain expenses in the financial statements that are not currently deductible for tax purposes and from differences between the tax and book basis of assets and liabilities recorded in connection with acquisitions. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion or all of the deferred tax assets will not be realized. The effect of changes in tax rates is recognized in the period the rate change is enacted.

Income Tax Valuation Allowance.  The Company records a valuation allowance against deferred income tax assets when management believes it is more likely than not that some portion or all of the deferred income tax assets will not be realized. Management considers factors such as the reversal of deferred income tax liabilities, projected future taxable income, the character of the income tax asset, tax planning strategies, changes in tax laws and other factors. A change to any of these factors could impact the estimated valuation allowance and income tax expense.The Company currently has a fully reserved valuation allowance on its deferred tax assets related to U.S. net operating losses. Realization of the deferred tax assets is evaluated on a quarterly basis and is based upon all available evidence. It is possible that sufficient positive evidence to support the realization of the Company’s net deferred tax assets will exist in the near future, and the previously provided valuation allowance could be reversed in whole or in part.

Interest Expense.  Interest expense primarily consists of the cost of borrowing on the 6.75% Notes, the 6.50% Notes and the revolving Credit Agreement. The Company uses the effective interest method to amortize the original issue discount and original issue premium on the 6.75% Notes. The Company amortizes deferred financing costs using the effective interest method over the lives of the 6.75% Notes and 6.50% Notes and straight line over the life of the Credit Agreement.

Stock-based Compensation.  The fair value method is applied to all awards granted, modified or settled. Under the fair value method, compensation cost is measured at fair value at the date of grant and is expensed over the service period that is the award’s vesting period. When awards are exercised, share capital is credited by the sum of the consideration paid together with the related portion previously credited to additional paid-in capital when compensation costs were charged against income or acquisition consideration. Stock-based awards that are settled in cash or may be settled in cash at the option of employees are recorded as liabilities. The measurement of the liability and compensation cost for these awards is based on the fair value of the award, and is recorded into operating income over the service period, that is the vesting period of the award. Changes in the Company’s payment obligation are revalued each period and recorded as compensation cost over the service period in operating income.

The Company treats amounts paid by shareholders to employees as a stock-based compensation charge with a corresponding credit to additional paid-in capital.

From time to time, certain acquisitions and step-up transactions include an element of compensation related payments. The Company accounts for those payments as stock-based compensation.

New Accounting Pronouncements

In May 2017, the FASB issued Accounting Standards Update (“ASU”) 2017-09, Compensation - Stock Compensation: Scope of Modification Accounting, which provides guidance concerning which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in ASC 718.  This guidance is effective for annual and interim periods beginning after December 15, 2017, and early adoption is permitted. Amendments in this ASU will be applied

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prospectively to any award modified on or after the adoption date.  The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits, which requires the presentation of the service cost component of the net periodic pension and postretirement benefits costs in the same line item in the statement of operations as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of the net periodic pension and postretirement benefits costs are required to be presented as non-operating expenses in the statement of operations. This guidance is effective for annual periods beginning after December 15, 2017 and early adoption is permitted. The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other: Simplifying the Test for Goodwill Impairment, which eliminates step two from the two-step goodwill impairment test. Under the new guidance, an entity will perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value provided the loss recognized does not exceed the total amount of goodwill allocated to that reporting unit. This guidance is effective for annual or interim goodwill impairment tests performed in fiscal years beginning after December 15, 2019. The Company will early adopt this guidance for our impairment test performed during 2017, and does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows. This new guidance is intended to reduce diversity in practice regarding the classification of certain transactions in the statement of cash flows. This guidance is effective January 1, 2018 and requires a retrospective transition method. Early adoption is permitted. The Company currently classifies all cash outflows for contingent consideration as a financing activity. Upon adoption the Company is required to classify only the original estimated liability as a financing activity and any changes as an operating activity.

In February 2016, the FASB issued ASU 2016-02, which amends the ASC and creates Topic 842, Leases. Topic 842 will require lessees to recognize right-to-use assets and lease liabilities for those leases classified as operating leases under previous U.S. GAAP on the balance sheet. This guidance is effective for annual periods beginning after December 15, 2018 and early adoption is permitted. While not yet in a position to assess the full impact of the application of the new standard, the Company expects that the impact of recording the lease liabilities and the corresponding right-to-use assets will have a significant impact on its total assets and liabilities with a minimal impact on equity.

In January 2016, the FASB issued ASU 2016-01,Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Liabilities, which will require equity investments, except equity method investments, to be measured at fair value and any changes in fair value will be recognized in results of operations. This guidance is effective for annual and interim periods beginning after December 15, 2017 and early application is not permitted. Additionally, this guidance provides for the recognition of the cumulative effect of retrospective application of the new standard in the period of initial application. The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which will replace all existing revenue guidance under U.S GAAP. The core principle of ASU 2014-09 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration expected to be received in exchange for those goods or services. On July 9, 2015, the FASB approved a one year deferral of the effective date of ASU 2014-09 to all annual and interim periods beginning after December 15, 2017. ASU 2014-09 provides for one of two methods of transition: (i) retrospective application to each prior period presented (Full Retrospective); or (ii) recognition of the cumulative effect of retrospective application of the new standard as of the beginning of the period of initial application (Modified Retrospective). The Company plans to apply ASU 2014-09 on the effective date of January 1, 2018, and intends to apply the Modified Retrospective method. Based on the Company’s assessment, the application of the new standard will result in a change in the timing of our revenue recognition within certain of the Company’s arrangements. Performance incentives are currently recognized in revenue when specific quantitative goals are achieved, or when the Company’s performance against qualitative goals is determined by the client. Under the new standard, the Company will be required to estimate the amount of the incentive that will be earned at the inception of the contract and recognize such incentive over the term of the contract. While performance incentives are not material to the Company’s revenue, this will result in an acceleration of revenue recognition for certain contract incentives compared to the current method. Further, based on the Company’s initial assessment, it is expected that an input measure such as cost to cost or labor hours would be an appropriate measure of progress in the majority of situations for which over time revenue recognition is applied.

Furthermore, in certain businesses, the Company records revenue as a principal and includes certain third-party-pass-through and out-of-pocket costs, which are billed to clients in connection with the services provided. In March 2016, the FASB issued further guidance on principal versus agent considerations; however, our initial assessments indicate that such change is not expected to have a material effect on the Company’s results of operations. The Company is continuing to evaluate the standard’s impact on the consolidated results of operations and financial condition, and the related disclosure requirements.

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Risks and Uncertainties

This document contains forward-looking statements. The Company’s representatives may also make forward-looking statements orally from time to time. Statements in this document that are not historical facts, including statements about the Company’s beliefs and expectations, recent business and economic trends, potential acquisitions, and estimates of amounts for redeemable noncontrolling interests and deferred acquisition consideration, constitute forward-looking statements. These statements are based on current plans, estimates and projections, and are subject to change based on a number of factors, including those outlined in this section. Forward-looking statements speak only as of the date they are made, and the Company undertakes no obligation to update publicly any of them in light of new information or future events, if any.

Forward-looking statements involve inherent risks and uncertainties. A number of important factors could cause actual results to differ materially from those contained in any forward-looking statements. Such risk factors include, but are not limited to, the following:

• risks associated with severe effects of international, national and regional economic conditions;

• the Company’s ability to attract new clients and retain existing clients;

• the spending patterns and financial success of the Company’s clients;

• the Company’s ability to retain and attract key employees;

• the Company’s ability to remain in compliance with its debt agreements and the Company’s ability to finance its contingent payment obligations when due and payable, including but not limited to redeemable noncontrolling interests and deferred acquisition consideration;

• the successful completion and integration of acquisitions which complement and expand the Company’s business capabilities;

• foreign currency fluctuations; and

• risks associated with the ongoing Canadian class litigation claim.

The Company’s business strategy includes ongoing efforts to engage in acquisitions of ownership interests in entities in the marketing communications services industry. The Company intends to finance these acquisitions by using available cash from operations, from borrowings under the Credit Agreement and through the incurrence of bridge or other debt financing, any of which may increase the Company’s leverage ratios, or by issuing equity, which may have a dilutive impact on existing shareholders proportionate ownership. At any given time, the Company may be engaged in a number of discussions that may result in one or more acquisitions. These opportunities require confidentiality and may involve negotiations that require quick responses by the Company. Although there is uncertainty that any of these discussions will result in definitive agreements or the completion of any transactions, the announcement of any such transaction may lead to increased volatility in the trading price of the Company’s securities.

Investors should carefully consider these risk factors, and the risk factors outlined in more detail in (i) Part II, Item 1A (Risk Factors) in this Quarterly Report on Form 10-Q and (ii) the Company’s 2016 Annual Report on Form 10-K/A under the caption “Risk Factors,” and in the Company’s other SEC filings.

Website Access to Company Reports

MDC Partners Inc.’s internet website address is www.mdc-partners.com. The Company’s Annual Reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K, and any amendments to those reports filed or furnished pursuant to section 13(a) or 15(d) of the Exchange Act, will be made available free of charge through the Company’s website as soon as reasonably practical after those reports are electronically filed with, or furnished to, the Securities and Exchange Commission.  The information found on, or otherwise accessible through, the Company’s website is not incorporated into, and does not form a part of, this quarterly report on Form 10-Q. From time to time, the Company may use its website as a channel of distribution of material company information.

Item 3.    Quantitative and Qualitative Disclosures About Market Risk

The Company is exposed to market risk related to interest rates and foreign currencies.

Debt Instruments:  At September 30, 2017, the Company’s debt obligations consisted of amounts outstanding under its Credit Agreement and the 6.50% Notes. The 6.50% Notes bear a fixed 6.50% interest rate. The Credit Agreement bears interest at variable rates based upon the Eurodollar rate, U.S. bank prime rate and U.S. base rate, at the Company’s option. The Company’s ability to obtain the required bank syndication commitments depends in part on conditions in the bank market at the time of syndication. Given that there were $48.6 million borrowings under the Credit Agreement, as of September 30, 2017, a 1.0% increase or decrease in the weighted average interest rate, which was 3.60% at September 30, 2017, would have an interest impact of $0.5 million.

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Foreign Exchange:  While the Company primarily conducts business in markets that use the U.S. dollar, the Canadian dollar, the Euro and the British Pound, its non-U.S. operations transact business in numerous different currencies. The Company’s results of operations are subject to risk from the translation to the U.S. dollar of the revenue and expenses of its non-U.S. operations. The effects of currency exchange rate fluctuations on the translation of the Company’s results of operations are discussed in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in Note 2 of the Notes to Unaudited Condensed Consolidated Financial Statements. For the most part, revenues and expenses incurred that related to the non-U.S. operations are denominated in their functional currency. This minimizes the impact that fluctuations in exchange rates will have on profit margins. Intercompany debt which is not intended to be repaid is included in cumulative translation adjustments. Translation of intercompany debt, which is not intended to be repaid, is included in cumulative translation adjustments. Translation of current intercompany balances are included in net earnings. The Company generally does not enter into foreign currency forward exchange contracts or other derivative financial instruments to hedge the effects of adverse fluctuations in foreign currency exchange rates.

The Company is exposed to foreign currency fluctuations relating to its intercompany balances between the U.S. and foreign entities. For every one cent change in the exchange rate between the U.S. and foreign currencies, the Company will incur a $3.5 million impact to its financial statements.

Item 4.    Controls and Procedures

Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures designed to ensure that information required to be included in our SEC reports is recorded, processed, summarized and reported within the applicable time periods specified by the SEC’s rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer (“CEO”), who is our principal executive officer, and Chief Financial Officer (“CFO”), who is our principal financial officer, as appropriate, to allow timely decisions regarding required disclosures. There are inherent limitations to the effectiveness of any system of disclosure controls and procedures, including the possibility of human error and the circumvention or overriding of the controls and procedures. Accordingly, even effective disclosure controls and procedures can only provide reasonable assurance of achieving their control objectives. However, our disclosure controls and procedures are designed to provide reasonable assurances of achieving our control objectives.

We conducted an evaluation, under the supervision and with the participation of our management, including our CEO, CFO and management Disclosure Committee, of the effectiveness of our disclosure controls and procedures as of the end of the period covered by this report pursuant to Rule 13a-15(e) and 15(d)-15(e) of the Exchange Act. Based on that evaluation, our CEO and CFO concluded that, as of September 30, 2017, our disclosure controls and procedures are effective to ensure that decisions can be made timely with respect to required disclosures, as well as ensuring that the recording, processing, summarization and reporting of information required to be included in our Quarterly Report on Form 10-Q for the quarter ended September 30, 2017 is appropriate.

Evaluation of New Reportable Segments; Changes in Internal Control Over Financial Reporting

As disclosed in the Company’s prior filings on Form 10-K/A for the year ended December 31, 2016, Form 10-Q/A for the quarterly period ended March 31, 2017 and Form 10-Q for the quarterly period ended June 30, 2017, we have recast our single reportable segment and identified four (4) new reportable segments for our Partner Firms. The recasting of prior period segment information does not affect our consolidated financial condition or results of operations for the three months ended March 31, 2017 and 2016, our balance sheets as of March 31, 2017 and December 31, 2016, our cash flows for the three months ended March 31, 2017 and 2016, or goodwill for any period presented.

During the third quarter of fiscal 2017, our management, including our CEO and CFO, concluded that the previously disclosed deficiency in internal controls that led to the determination to recast the Company’s reportable segments reflected a material weakness in our internal controls over segment reporting aggregation and related disclosure controls as of December 31, 2016 and March 31, 2017. A material weakness is a deficiency, or combination of deficiencies, in internal control over financial reporting such that there is a reasonable possibility that a material misstatement of our annual or interim financial statements will not be prevented or detected on a timely basis. The material weakness in internal controls over financial reporting arose from an undetected error in management’s judgment and management’s misapplication of ASC 280, specifically the weighting used in the analysis regarding aggregation of operating segments with respect to future and past economic performance. Although our internal “Segment Reporting Policy” included an analysis for segment aggregation criteria, management subsequently identified a design gap in that the analysis failed to contain sufficient detail on the weighting to future and past economic performance, as required by ASC 280 and related guidance. 

In response to the identified material weakness, the Company implemented remediation steps to ensure that its prospective determination of reportable segments is appropriate. The Company promptly updated its aggregation analysis and revised its disclosure of its four (4) reportable segments. Additionally, management enhanced and expanded its internal “Segment

63

Reporting Policy” to include further detail on how the application of aggregation criteria related to economic characteristics should be applied.This additional detail includes reference to quantitative and qualitative factors, types of metrics being considered and the acceptable level of differences in those metrics between the segments being evaluated for aggregation. Under the Company’s revised approach, this analysis will be performed and documented annually. The Company’s management will continue to evaluate the impact of events (e.g., a change in operating segments, reorganization, change in management approach, etc.) that may arise and impact the Company’s reportable segment structure and document that assessment and related conclusions as necessary.  The Company has enhanced its review controls to ensure proper weighting to future and past economic performance, as required by ASC 280.  Testing of both the design and operating effectiveness of the Company’s enhanced controls was completed, and management concluded that the material weaknesses described above had been fully remediated as of September 30, 2017.

Other than the foregoing actions relating to the recast of the Company’s reportable segments, management believes there have been no changes in our internal control over financial reporting during the fiscal quarter ended September 30, 2017 that materially affected, or were reasonably likely to materially affect, our internal control over financial reporting.

64

PART II. OTHER INFORMATION

Item 1.    Legal Proceedings

The Company’s operating entities are involved in legal proceedings of various types. While any litigation contains an element of uncertainty, the Company has no reason to believe that the outcome of such proceedings or claims will have a material adverse effect on its financial condition or results of operations, except as set forth below and under “Item 1A Risk Factors” of this Quarterly Report on Form 10-Q in connection with the ongoing Canadian securities class action litigation claim.

Class Action Litigation in Canada

On August 7, 2015, Roberto Paniccia issued a Statement of Claim in the Ontario Superior Court of Justice in the City of Brantford, Ontario seeking to certify a class action suit naming the following as defendants: MDC, former CEO Miles S. Nadal, former CAO Michael C. Sabatino, CFO David Doft and BDO U.S.A. LLP.  The Plaintiff alleges violations of section 138.1 of the Ontario Securities Act (and equivalent legislation in other Canadian provinces and territories) as well as common law misrepresentation based on allegedly materially false and misleading statements in the Company’s public statements, as well as omitting to disclose material facts with respect to the SEC investigation.  The Company intends to continue to vigorously defend this Canadian suit on the same basis as which the U.S. class action was previously dismissed.  A first case management meeting has been held. The Plaintiff has served his material for leave to proceed under the Securities Act. MDC and the other defendants have served a motion to limit the scope of the proposed class definition to Canadian residents who purchased and sold shares of MDC stock on the Toronto Stock Exchange. Those motions are scheduled to be heard by the Court on November 21, 2017.

Item 1A.    Risk Factors

There are no material changes in the risk factors set forth in Part I, Item 1A of the Company’s Annual Report on Form 10-K/A for the year ended December 31, 2016.

Item 2.    Unregistered Sales of Equity Securities and Use of Proceeds

None.

Item 3.    Defaults Upon Senior Securities

None.

Item 4.    Mine Safety Disclosures

Not applicable.

Item 5.    Other Information

The Company received comment letters from the Securities and Exchange Commission (the “SEC”) Division of Corporation Finance dated May 18, 2016, August 9, 2016, October 5, 2016, December 16, 2016, February 28, 2017, June 14, 2017 and October 4, 2017, regarding its Annual Reports on Form 10-K for the fiscal years ended December 31, 2015 and December 31, 2016. The Company has filed detailed responses to each of these letters with the SEC, and we have incorporated into our subsequent periodic filings with the SEC (including this Quarterly Report on Form 10-Q) additional disclosures that we believe are responsive to the SEC’s comments. Certain of these SEC comments remained unresolved as of November 1, 2017, specifically relating to the Company’s disclosure concerning its evaluation of internal controls for the identification and aggregation of reportable segments in accordance with Financial Accounting Standards Board Accounting Standards Codification Topic 280-10.

Item 6.    Exhibits

The exhibits required by this item are listed on the Exhibit Table.

65

SIGNATURES

Pursuant to the requirements 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.

MDC PARTNERS INC.

/s/ David Doft

David Doft

Chief Financial Officer and Authorized Signatory

November 1, 2017

66

EXHIBIT INDEX

Exhibit No.	Description
12	Statement of computation of ratio of earnings to fixed charges.*
31.1	Certification by Chief Executive Officer pursuant to Rules 13a - 14(a) and 15d - 14(a) under the Securities Exchange Act of 1934 and Section 302 of the Sarbanes-Oxley Act of 2002.*
31.2	Certification by Chief Financial Officer pursuant to Rules 13a - 14(a) and 15d - 14(a) under the Securities Exchange Act of 1934 and Section 302 of the Sarbanes-Oxley Act of 2002.*
32.1	Certification by Chief Executive Officer pursuant to 18 USC. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*
32.2	Certification by Chief Financial Officer pursuant to 18 USC. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*
99.1	Schedule of Advertising and Communications Companies.*
101	Interactive data file.*

* Filed electronically herewith.

67

EX-12

Exhibit 12

Statement of Computation of Ratio of Earnings to Fixed Charges

	Nine Months Ended September 30,
	2017		2016
	(000’s)		(000’s)
Earnings:
Income (loss) from continuing operations attributable to MDC Partners Inc.	$	19,180	$	(54,937	)
Additions:
Income tax expense	17,659		1,180
Net income attributable to the noncontrolling interests	6,588		3,172
Fixed charges, as shown below	64,161		95,444
Distributions received from equity-method investments	—		123
	88,408		99,796
Subtractions:
Equity in earnings of non-consolidated affiliates	1,924		9
Earnings as adjusted	$	105,664	$	44,850
Fixed charges:
Interest on indebtedness, expensed or capitalized	46,841		73,851
Amortization of debt discount and expense and premium on indebtedness, expensed or capitalized	2,018		8,736
Interest within rent expense	15,302		12,857
Total fixed charges	$	64,161	$	95,444
Ratio of earnings to fixed charges	1.65		N/A
Fixed charge deficiency	N/A		$	50,471

EX-31.1

Exhibit 31.1

Certification Pursuant to Rules 13a-14(a) and 15d-14(a) as Adopted Pursuant to Section

302 of the Sarbanes-Oxley Act of 2002

I, Scott L. Kauffman, certify that:

1. I have reviewed this quarterly report on Form 10-Q for the quarter ended September 30, 2017 of MDC Partners 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 registrant’s board of directors (or persons performing the equivalent function):

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: November 1, 2017		/s/ SCOTT L. KAUFFMAN
	By:	Scott L. Kauffman
	Title:	Chairman and Chief Executive Officer

EX-31.2

Exhibit 31.2

Certification Pursuant to Rules 13a-14(a) and 15d-14(a) as Adopted Pursuant to Section

302 of the Sarbanes-Oxley Act of 2002

I, David B. Doft, certify that:

1. I have reviewed this quarterly report on Form 10-Q for the quarter ended September 30, 2017 of MDC Partners 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 registrant’s board of directors (or persons performing the equivalent function):

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: November 1, 2017		/s/ DAVID B. DOFT
	By:	David B. Doft
	Title:	Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification 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 quarterly report of MDC Partners Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2017, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Scott L. Kauffman, Chairman and Chief Executive 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 my 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.

Date: November 1, 2017
/s/ SCOTT L. KAUFFMAN
By:	Scott L. Kauffman
Title:	Chairman and Chief Executive Officer

EX-32.2

Exhibit 32.2

Certification 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 quarterly report of MDC Partners Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2017 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David B. Doft, 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 my 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.

Date: November 1, 2017
/s/ DAVID B. DOFT
By:	David B. Doft
Title:	Chief Financial Officer

EX-99.1

Exhibit 99.1

MDC PARTNERS INC.

SCHEDULE OF ADVERTISING AND COMMUNICATIONS COMPANIES

MDC maintains a majority or 100% ownership position in substantially all of its operating partner companies, with management of the partner companies owning the remaining equity.  MDC generally has rights to increase its ownership of non-wholly owned subsidiaries to 100% over a defined period of time.

	Year of Initial
Company	Investment	Locations
Consolidated:
Global Integrated Agencies:
72andSunny	2010	Los Angeles, New York, Netherlands, UK, Australia, Singapore
Anomaly	2011	New York, Los Angeles, Netherlands, Canada, UK, China, Germany
Crispin Porter + Bogusky	2001	Miami, Boulder, Los Angeles, UK, Denmark, Brazil, China
Doner	2012	Detroit, Cleveland, Los Angeles, UK
Forsman & Bodenfors	2016	Sweden
kbs+	2004	New York, Canada, China, UK, Los Angeles
Albion	2014	UK
Attention	2009	New York, Los Angeles
The Media Kitchen	2010	New York, Canada, UK
Domestic Creative Agencies:
Colle + McVoy	1999	Minneapolis
Laird + Partners	2011	New York
Mono Advertising	2004	Minneapolis, San Francisco
Union	2013	Canada
Specialist Communications:
Allison & Partners	2010	San Francisco, Los Angeles, New York and other US Locations, China, France, Singapore, UK, Japan, Germany
HL Group Partners	2007	New York, Los Angeles, China
Hunter PR	2014	New York, UK
Kwittken	2010	New York, UK, Canada
Luntz Global	2014	Washington, D.C.
Sloane & Company	2010	New York
Veritas	1993	Canada
Media Services:
MDC Media Partners	2010
Assembly	2010	New York, Detroit, Atlanta, Los Angeles
EnPlay	2015	New York
Trade X	2011	New York
Unique Influence	2015	Austin
Varick Media Management	2010	New York
All Other:
6degrees Communications	1993	Canada
Boom Marketing	2005	Canada
Bruce Mau Design	2004	Canada
Civilian	2000	Chicago
Concentric Partners	2011	New York, UK
Gale Partners	2014	Canada, New York, India
Hello Design	2004	Los Angeles
Kenna	2010	Canada
Kingsdale	2014	Canada, New York
Northstar Research Partners	1998	Canada, New York, UK, Indonesia
Redscout	2007	New York, San Francisco, UK
Relevent	2010	New York
Source Marketing	1998	Norwalk, Pittsburgh
TEAM	2010	Ft. Lauderdale
Vitro	2004	San Diego, Austin
Yamamoto	2000	Minneapolis
Y Media Labs	2015	Redwood City, New York, India

XML

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 27, 2017	Dec. 31, 2016
Document Information [Line Items]
Entity Registrant Name	MDC PARTNERS INC
Entity Central Index Key	0000876883
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Trading Symbol	MDCA
Document Type	10-Q
Document Fiscal Year Focus	2017
Document Period End Date	Sep. 30, 2017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		58,357,062
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		3,755
Convertible Preferred Stock [Member] | Series 4 Convertible Preferred Stock [Domain]
Document Information [Line Items]
Stock Issued During Period, Shares, Convertible Preferred Shares	95,000	95,000	0

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share, Basic	$ 0.25	$ (0.62)	$ 0.24	$ (1.08)
Earnings Per Share, Diluted	$ 0.24	$ (0.62)	$ 0.24	$ (1.08)
Revenue:
Services	$ 375,800,000	$ 349,254,000	$ 1,111,032,000	$ 995,343,000
Operating expenses:
Cost of services sold	249,418,000	235,659,000	754,803,000	675,940,000
Office and general expenses	77,910,000	83,303,000	251,313,000	233,840,000
Depreciation and amortization	11,252,000	11,412,000	32,916,000	34,068,000
Goodwill, Impairment Loss	0	29,631,000	0	29,631,000
Costs and Expenses, Total	338,580,000	360,005,000	1,039,032,000	973,479,000
Operating profit	37,220,000	(10,751,000)	72,000,000	21,864,000
Other income (expense):
Other, net	8,649,000	(6,008,000)	17,812,000	9,530,000
Interest and Debt Expense	16,403,000	16,540,000	48,859,000	49,289,000
Loss on redemption of notes	0	0	0	(33,298,000)
Interest income	145,000	218,000	550,000	599,000
Nonoperating Income (Expense), Total	(7,609,000)	(22,330,000)	(30,497,000)	(72,458,000)
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates	29,611,000	(33,081,000)	41,503,000	(50,594,000)
Income tax expense	9,049,000	(1,930,000)	17,659,000	1,180,000
Income (loss) before equity in earnings of non-consolidated affiliates	20,562,000	(31,151,000)	23,844,000	(51,774,000)
Equity in earnings (loss) of non-consolidated affiliates	1,422,000	70,000	1,924,000	9,000
Net income (loss)	21,984,000	(31,081,000)	25,768,000	(51,765,000)
Net income attributable to noncontrolling interests	(3,491,000)	(1,059,000)	(6,588,000)	(3,172,000)
Net income (loss) attributable to MDC Partners Inc.	$ 18,493,000	$ (32,140,000)	$ 19,180,000	$ (54,937,000)
Weighted average number of common shares outstanding:
Weighted Average Number of Shares Outstanding, Basic and Diluted	57,566,707	52,244,819	53,915,536	50,861,890
Share-based Compensation	$ 6,380,000	$ 5,228,000	$ 16,870,000	$ 15,443,000
Net Income (Loss) Available to Common Stockholders, Basic	16,545,000	(32,140,000)	14,815,000	(54,937,000)
Cost of Sales [Member]
Weighted average number of common shares outstanding:
Share-based Compensation	5,310,000	3,026,000	12,558,000	10,393,000
General and Administrative Expense [Member]
Weighted average number of common shares outstanding:
Share-based Compensation	1,070,000	2,202,000	4,312,000	5,050,000
Series 4 Convertible Preferred Stock [Domain] | Convertible Preferred Stock [Member]
Other income (expense):
Accretion on convertible preferred shares	$ (1,948,000)	$ 0	$ (4,365,000)	$ 0

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Comprehensive income (loss)
Net income (loss)	$ 21,984	$ (31,081)	$ 25,768	$ (51,765)
Other comprehensive income (loss), net of applicable tax:
Foreign currency translation adjustment	1,912	(2,331)	1,294	8,354
Other comprehensive income (loss)	(1,912)	2,331	(1,294)	(8,354)
Comprehensive income (loss) for the period	20,072	(28,750)	24,474	(60,119)
Comprehensive income attributable to the noncontrolling interests	(4,695)	(569)	(9,063)	(4,481)
Comprehensive income (loss) attributable to MDC Partners Inc.	$ 15,377	$ (29,319)	$ 15,411	$ (64,600)

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 18,861	$ 27,921
Cash held in trusts	5,182	5,341
Accounts receivable, less allowance for doubtful accounts of $1,933 and $1,523	438,765	388,340
Expenditures billable to clients	42,332	33,118
Other current assets	27,647	34,862
Total current assets	532,787	489,582
Fixed assets, at cost, less accumulated depreciation of $115,884 and $105,134	91,153	78,377
Investments in non-consolidated affiliates	5,655	4,745
Goodwill	839,361	844,759
Other intangible assets, net	74,685	85,071
Deferred tax assets	39,598	41,793
Other assets	34,592	33,051
Total assets	1,617,831	1,577,378
Current liabilities:
Accounts payable	232,704	251,456
Trust liability	5,182	5,341
Accruals and other liabilities	289,471	303,581
Advance billings	165,600	133,925
Current portion of long-term debt	300	228
Current portion of deferred acquisition consideration	59,849	108,290
Total current liabilities	753,106	802,821
Long-term debt, less current portion	930,889	936,208
Long-term portion of deferred acquisition consideration	88,419	121,274
Other liabilities	54,657	56,012
Deferred tax liabilities	119,602	110,359
Total liabilities	1,946,673	2,026,674
Redeemable noncontrolling interests (Note 2)	60,092	60,180
Shareholders’ deficit:
Charges in excess of capital	(307,454)	(311,581)
Accumulated deficit	(562,668)	(581,848)
Total shareholders’ deficit	(388,934)	(509,476)
Total liabilities, redeemable noncontrolling interests, and shareholders’ deficit	1,617,831	1,577,378
Common Class A
Shareholders’ deficit:
Common shares	351,075	317,784
Preferred Stock [Member] | Series 4 Convertible Preferred Stock [Domain]
Shareholders’ deficit:
Convertible preference shares (liquidation preference $97,417)	90,220
Total shareholders’ deficit	90,220	0
Share Capital To Be Issued [Member]
Shareholders’ deficit:
Shares to be issued, 100,000 shares in 2016	0	2,360
Share Capital To Be Issued [Member] | Common Class A
Shareholders’ deficit:
Shares to be issued, 100,000 shares in 2016	0	2,360
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Shareholders’ deficit:
Accumulated other comprehensive loss	(5,593)	(1,824)
Total shareholders’ deficit	(5,593)	(1,824)
Parent [Member]
Shareholders’ deficit:
MDC Partners Inc. shareholders’ deficit	(434,420)	(575,109)
Total shareholders’ deficit	(434,420)	(575,109)
Noncontrolling Interest [Member]
Shareholders’ deficit:
Noncontrolling interests	45,486	65,633
Total shareholders’ deficit	$ 45,486	$ 65,633

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 2,800	$ 1,523
Accumulated depreciation (in dollars)	$ 118,241	$ 105,134
Stock Issued During Period, Shares, Convertible Preferred Shares	90,220,000
Common stock, shares issued	56,314,344	52,802,058
Convertible Preferred Stock [Member] | Series 4 Convertible Preferred Stock [Domain]
Preferred Stock, Liquidation Preference, Value	$ 99,365	$ 0
Stock Issued During Period, Shares, Convertible Preferred Shares	95,000	0
Shares, Outstanding	95,000	0
Common Stock [Member]
Shares, Outstanding	56,314,344	52,802,058
Common stock, shares outstanding	56,314,344	52,802,058
Common Stock [Member] | Common Class A
Shares, Outstanding	56,310,589	52,798,303
Common Stock [Member] | Common Class B
Shares, Outstanding	3,755
Share Capital To Be Issued [Member]
Shares to be issued, shares	0	100,000

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income (loss)	$ 25,768,000	$ (51,765,000)
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Stock-based compensation	16,870,000	15,443,000
Depreciation	18,000,000	16,853,000
Amortization of intangibles	14,916,000	17,215,000
Amortization of deferred finance charges	2,018,000	8,736,000
Goodwill, Impairment Loss	0	29,631,000
Adjustment to deferred acquisition consideration	13,354,000	17,363,000
Deferred income tax	8,125,000	(553,000)
(Gain) loss on sale of assets	1,245,000	377,000
(Earnings) losses of non-consolidated affiliates	(1,924,000)	(9,000)
Other non-current assets and liabilities	(4,388,000)	1,853,000
Foreign exchange	(15,113,000)	(12,806,000)
Changes in working capital:
Accounts receivable	(54,723,000)	(47,767,000)
Expenditures billable to clients	(9,294,000)	5,551,000
Prepaid expenses and other current assets	6,400,000	(16,851,000)
Accounts payable, accruals and other liabilities	(31,149,000)	(77,355,000)
Advance billings	32,015,000	25,824,000
Net cash provided by (used in) operating activities	22,120,000	(41,387,000)
Cash flows used in investing activities:
Capital expenditures	(28,305,000)	(19,723,000)
Deposits	(1,461,000)	0
Acquisitions, net of cash acquired	0	2,531,000
Distributions from non-consolidated affiliates	(1,530,000)	(2,571,000)
Net Cash Provided by (Used in) Investing Activities	(19,503,000)	(14,663,000)
Cash flows provided by financing activities:
Acquisition related payments	(89,126,000)	(129,616,000)
Repayment of long-term debt	(310,000)	(381,000)
Purchase of shares	(1,239,000)	(2,798,000)
Premium paid on redemption of notes	0	(26,873,000)
Deferred financing costs	0	(21,569,000)
Distributions to noncontrolling interests	(5,272,000)	(6,549,000)
Payment of dividends	(284,000)	(32,580,000)
Net Cash Provided by (Used in) Financing Activities	(11,683,000)	15,131,000
Effect of exchange rate changes on cash and cash equivalents	6,000	1,196,000
Decrease in cash and cash equivalents	(9,060,000)	(39,723,000)
Cash and cash equivalents at beginning of period	27,921,000	61,458,000
Cash and cash equivalents at end of period	18,861,000	21,735,000
Supplemental disclosures:
Cash income taxes paid	6,909,000	2,798,000
Cash interest paid	32,324,000	27,979,000
Change in cash held in trusts	(159,000)	147,000
Non-cash transactions:
Capital leases	621,000	0
Dividends payable	453,000	1,077,000
Deferred acquisition consideration settled through issuance of shares	27,852,000
Proceeds from Sale of Other Assets, Investing Activities	11,120,000	215,000
Payments of Distributions to Affiliates	673,000	4,885,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	0	34,219,000
Leasehold improvements financed by landlord	0	7,250,000
Six Point Seven Five Percentage Notes [Member]
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Loss on redemption of notes	0	26,873,000
Cash flows provided by financing activities:
Repayment of 6.75% Notes	0	(735,000,000)
Six Point Five Zero Percentage Notes [Domain]
Cash flows provided by financing activities:
Proceeds from issuance of 6.50% Notes	0	900,000,000
Wells Fargo Capital Finance, LLC | Revolving Credit Facility [Member]
Cash flows provided by financing activities:
Repayments of revolving credit agreement	(1,093,508,000)	(1,255,608,000)
Proceeds from revolving credit agreement	1,087,688,000	1,326,105,000
Common Stock [Member]
Non-cash transactions:
Deferred acquisition consideration settled through issuance of shares	28,727,000
Series 4 Convertible Preferred Stock [Domain]
Cash flows provided by financing activities:
Proceeds from issuance of convertible preference shares	95,000,000	0
Convertible Preferred Stock [Member]
Cash flows provided by financing activities:
Convertible preference shares issuance costs	$ (4,632,000)	0
Common Class A [Member] | Common Stock [Member]
Non-cash transactions:
Deferred acquisition consideration settled through issuance of shares		$ 10,458,000

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CONDENSED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($) $ in Thousands	Total	Common Class A	Convertible Preferred Stock [Member] Series 4 Convertible Preferred Stock [Domain]	Common Stock	Common Stock Common Class A	Common Stock Common Class B	Share Capital To Be Issued [Member]	Share Capital To Be Issued [Member] Common Class A	Additional Paid-in Capital	Charges in Excess of Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Parent [Member]	Noncontrolling Interest [Member]
Common Stock, Value, Issued		$ 317,784
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, To be Issued							100,000
Common Stock, Value, To be Issued							$ 2,360	$ 2,360
Balance at Dec. 31, 2016	$ (509,476)		$ 0	$ 317,784					$ 0	$ (311,581)	$ (581,848)	$ (1,824)	$ (575,109)	$ 65,633
Balance (in shares) at Dec. 31, 2016			0	52,802,058	52,798,303
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to MDC Partners Inc.	19,180										19,180		19,180	0
Other Comprehensive income (loss)	(1,294)											(3,769)	(3,769)	2,475
Issuance of restricted stock	$ 0			$ 5,803					(5,803)				$ 0
Stock Issued During Period, Shares, New Issues	90,220,000		95,000										90,220,000
Stock Issued During Period, Value, Convertible Preferred Shares			$ 90,220
Deferred acquisition consideration settled through issuance of shares	$ 27,852			$ 28,727					1,485				$ 27,852
Stock Authorized During Period, Shares, To be Issued							(100,000)
Stock Authorized During Period, Value, To be Issued							$ (2,360)
Issuance of restricted stock (in shares)				273,169
Shares acquired and cancelled	(1,239)			$ (1,239)									(1,239)
Stock Issued During Period, Shares, New Issues				3,353,939
Shares acquired and cancelled (in shares)				(114,822)
Stock-based compensation	6,082								6,082				6,082
Temporary Equity, Accretion to Redemption Value	(300)								(300)				(300)
Noncontrolling Interest, Increase from Business Combination	2,315								2,315				2,315
Noncontrolling Interest, Decrease from Deconsolidation	(10,657)
Adjustments to Additional Paid in Capital, Other	348								348				348
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(9,650)												2,315	(11,965)
Transfer to charges in excess of capital									(4,127)	4,127
Balance at Sep. 30, 2017	$ (388,934)		$ 90,220	$ 351,075					$ 0	$ (307,454)	$ (562,668)	$ (5,593)	$ (434,420)	$ 45,486
Balance (in shares) at Sep. 30, 2017			95,000	56,314,344	56,310,589	3,755
Common Stock, Value, Issued		$ 351,075
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, To be Issued							0
Common Stock, Value, To be Issued							$ 0	$ 0

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Acquisitions

9 Months Ended

Sep. 30, 2017

Business Combinations [Abstract]

Acquisitions

Valuations of acquired companies are based on a number of factors, including specialized know-how, reputation, competitive position and service offerings. The Company’s acquisition strategy has been focused on acquiring the expertise of an assembled workforce in order to continue to build upon the core capabilities of its various strategic business platforms to better serve the Company’s clients. The Company’s strategy includes acquiring ownership stakes in well-managed businesses with strong reputations in the industry. The Company’s model of “Perpetual Partnership” often involves acquiring a majority interest rather than a 100% interest and leaving management owners with a significant financial interest in the performance of the acquired entity for a minimum period of time, typically not less than five years. The Company’s acquisition model in this scenario typically provides for (i) an initial payment at the time of closing, (ii) additional contingent purchase price obligations based on the future performance of the acquired entity, and (iii) an option by the Company to purchase (and in some instances a requirement to so purchase) the remaining interest of the acquired entity under a predetermined formula.

Contingent purchase price obligations. The Company’s contingent purchase price obligations are generally payable within a five year period following the acquisition date, and are based on (i) the achievement of specific thresholds of future earnings, and (ii) in certain cases, the growth rate of those earnings. Contingent purchase price obligations are recorded as deferred acquisition consideration on the balance sheet at the acquisition date fair value and adjusted at each reporting period through operating income or net interest expense, depending on the nature of the arrangement. On occasion, the Company may initiate a renegotiation of previously acquired ownership interests and any resulting change in the estimated amount of consideration to be paid is adjusted in the reporting period through operating income or net interest expense, depending on the nature of the arrangement. See Notes 2, 9, and 12 for additional information on the deferred acquisition consideration.

Options to purchase. When acquiring less than 100% ownership, the Company may enter into agreements that give the Company an option to purchase, or require the Company to purchase, the incremental ownership interests under certain circumstances. Where the option to purchase the incremental ownership is within the Company’s control, the amounts are recorded as noncontrolling interests in the equity section of the Company’s balance sheet. Where the incremental purchase may be required of the Company, the amounts are recorded as redeemable noncontrolling interests in mezzanine equity at their estimated acquisition date redemption value and adjusted at each reporting period for changes to their estimated redemption value through additional paid-in capital (but not less than their initial redemption value), except for foreign currency translation adjustments. On occasion, the Company may initiate a renegotiation to acquire an incremental ownership interest and the amount of consideration paid may differ materially from the balance sheet amounts. See Note 12 for additional information on redeemable noncontrolling interests.

Employment conditions. From time to time, specifically when the projected success of an acquisition is deemed to be dependent on retention of specific personnel, such acquisition may include deferred payments that are contingent upon employment terms as well as financial performance. The Company accounts for those payments through operating income as stock-based compensation over the required retention period. For the three and nine months ended September 30, 2017 and 2016, stock-based compensation included $4,064 and $9,792, respectively, and $2,259 and $7,184, respectively, of expense relating to those payments.

Distributions to noncontrolling shareholders. If noncontrolling shareholders have the right to receive distributions based on the profitability of an acquired entity, the amount is recorded as income attributable to noncontrolling interests.  However, there are circumstances when the Company acquires a majority interest and the selling shareholders waive their right to receive distributions with respect to their retained interest for a period of time, typically not less than five years.  Under this model, the right to receive such distributions typically begins concurrently with the purchase option period and, therefore, if such option is exercised at the first available date, the Company may not record any noncontrolling interest over the entire period from the initial acquisition date through the acquisition date of the remaining interests.

2017 Acquisitions

In 2017, the Company entered into various non-material transactions in connection with certain of its majority-owned entities. As a result of the foregoing, the Company made total cash closing payments of $3,858, increased fixed deferred consideration liability by $7,208, reduced redeemable noncontrolling interests by $816, reduced noncontrolling interests equity by $11,965, reduced noncontrolling interest payable by $397, and increased additional paid-in capital by $2,316. In addition, a stock-based compensation charge of $996 has been recognized representing the consideration paid in excess of the fair value of the interest acquired.

2017 Dispositions

During the three months ended September 30, 2017, the Company sold all of its ownership interests in three subsidiaries resulting in recognition of a net loss on sale of business of $1,424. The net assets reflected in the calculation of the net loss on sale was inclusive of goodwill of $17,593. Goodwill was allocated to the subsidiaries based on the relative fair value of the sold subsidiaries compared to the fair value of the respective reporting units. See Note 1 for details. Additionally, the Company recorded a reduction in noncontrolling interests of $10,657.

2016 Acquisitions

Effective July 1, 2016, the Company acquired 100% of the equity interests of Forsman & Bodenfors AB (“F&B”), an advertising agency based in Sweden, for an estimated aggregate purchase price at acquisition date of $49,837, consisting of a closing payment of 1,900,000 MDC Class A subordinate voting shares with an acquisition date fair value of $34,219, plus additional deferred acquisition payments with an estimated present value at acquisition date of $15,618. The amount of additional payments are based on the financial results of the acquired business for 2015 and 2016 as well as for the value of the Company’s shares from July 1, 2016 up to and including the close of business on November 2, 2016. During the three months ended June 30, 2017, the Company paid cash of $3,055 and issued an additional 2,450,000 MDC Class A subordinate voting shares with a fair value of $20,800 as a settlement of deferred acquisition consideration.

An allocation of excess purchase price consideration of this acquisition to the fair value of the net assets acquired resulted in identifiable intangibles of $36,698, consisting primarily of customer lists, trade names and covenants not to compete, and goodwill of $24,778, including the value of the assembled workforce. The identified assets have a weighted average useful life of approximately 10.8 years and will be amortized in a manner represented by the pattern in which the economic benefits of such assets are expected to be realized. In addition, the Company has recorded $2,275 as the present value of redeemable noncontrolling interests and $5,514 as the present value of noncontrolling interests both relating to the noncontrolling interest of F&B’s subsidiaries. None of the intangibles and goodwill are tax deductible and the Company recorded a deferred tax liability of $8,074 related to the intangibles. F&B’s results are included in the Global Integrated Agencies segment.

During the six months ended June 30, 2017, F&B earned revenue of $43,535 and incurred a net loss of $4,460, which is included in our consolidated results for the nine months ended September 30, 2017. The net loss was attributable to an increase in the deferred acquisition payment liability related to such acquisition, driven by the decrease in t    he future market performance of the Company’s stock price and the amortization of the intangibles identified in the allocation of the purchase price consideration.

Effective April 1, 2016, the Company acquired the remaining 40% ownership interests of Luntz Global Partners LLC. In 2016, the Company also entered into various non-material transactions in connection with other majority-owned entities. As a result of the foregoing, the Company made total cash closing payments of $1,581, eliminated the contingent deferred acquisition payments of $4,052 and fixed deferred acquisition payments of $467 related to certain initial acquisition of the equity interests, reduced other assets by $428, reduced redeemable noncontrolling interests by $1,005, reduced noncontrolling interests by $19,354, increased accruals and other liabilities by $94, and increased additional paid-in capital by $22,775. Additional deferred payments with an estimated present value at acquisition date of $2,393 that are contingent upon service conditions have been excluded from deferred acquisition consideration and will be expensed as stock-based compensation over the required service period.

2016 Dispositions

Effective September 30, 2016, the Company sold all of its ownership interests in Bryan Mills to the noncontrolling shareholders and recognized a loss of $800. The net assets reflected in the calculation of the loss on sale was inclusive of goodwill of $764.

Noncontrolling Interests

Changes in the Company’s ownership interests in its less than 100% owned subsidiaries during the three and nine months ended September 30, 2017 and 2016 were as follows:

Net Income (Loss) Attributable to MDC Partners Inc. and

Transfers (to) from the Noncontrolling Interests

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017		2016
Net income (loss) attributable to MDC Partners Inc.	$	18,493		$	(32,140	)	$	19,180	$	(54,937	)
Transfers from the noncontrolling interest:
(Decrease) increase in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of Redeemable Noncontrolling Interests and Noncontrolling Interests	(337		)	(520		)	2,315		22,498
Net transfers from noncontrolling interests	$	(337	)	$	(520	)	$	2,315	$	22,498
Change from net income (loss) attributable to MDC Partners Inc. and transfers to noncontrolling interests	$	18,156		$	(32,660	)	$	21,495	$	(32,439	)

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Accruals and Other Liabilities

9 Months Ended

Sep. 30, 2017

Accrued and Other Liabilities [Abstract]

Accruals and Other Liabilities

At September 30, 2017 and December 31, 2016, accruals and other liabilities included accrued media of $169,460 and $201,872, respectively; and included amounts due to noncontrolling interest holders for their share of profits, which will be distributed within the next twelve months of $5,802 and $4,154, respectively.

Changes in amounts due to noncontrolling interest holders included in accrued and other liabilities for the year ended December 31, 2016 and nine months ended September 30, 2017 were as follows:

	Noncontrolling Interests
Balance, December 31, 2015	$	5,473
Income attributable to noncontrolling interests	5,218
Distributions made	(7,772		)
Other (1)	1,235
Balance, December 31, 2016	$	4,154
Income attributable to noncontrolling interests	6,588
Distributions made	(5,272		)
Other (1)	332
Balance, September 30, 2017	$	5,802

(1) Other consists primarily of business acquisitions, sale of a business, step-up transactions, and cumulative translation adjustments.

At September 30, 2017 and December 31, 2016, accounts payable included $47,430 and $80,193 of outstanding checks, respectively.

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Debt

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Debt

6.50% Notes

On March 23, 2016, MDC entered into an indenture (the “Indenture”) among MDC, its existing and future restricted subsidiaries that guarantee, are co-borrowers under, or grant liens to secure, the Credit Agreement, as guarantors (the “Guarantors”) and The Bank of New York Mellon, as trustee, relating to the issuance by MDC of $900,000 aggregate principal amount of the 6.50% Notes. The 6.50% Notes were sold in a private placement in reliance on exceptions from registration under the Securities Act of 1933. The 6.50% Notes bear interest at a rate of 6.50% per annum, accruing from March 23, 2016. Interest is payable semiannually in arrears on May 1 and November 1 of each year, beginning November 1, 2016. The 6.50% Notes mature on May 1, 2024, unless earlier redeemed or repurchased. The Company received net proceeds from the offering of the 6.50% Notes equal to approximately $880,000. The Company used the net proceeds to redeem all of its existing 6.75% Notes, together with accrued interest, related premiums, fees and expenses and recorded a charge for the loss on redemption of such notes of $33,298, including write offs of unamortized original issue premium and debt issuance costs. Remaining proceeds were used for general corporate purposes, including funding of deferred acquisition consideration.

The 6.50% Notes are guaranteed on a senior unsecured basis by all of MDC’s existing and future restricted subsidiaries that guarantee, or are co-borrowers under or grant liens to secure, the Credit Agreement. The 6.50% Notes are unsecured and unsubordinated obligations of MDC and rank (i) equally in right of payment with all of MDC’s or any Guarantor’s existing and future senior indebtedness, (ii) senior in right of payment to MDC’s or any Guarantor’s existing and future subordinated indebtedness, (iii) effectively subordinated to all of MDC’s or any Guarantor’s existing and future secured indebtedness to the extent of the collateral securing such indebtedness, including the Credit Agreement, and (iv) structurally subordinated to all existing and future liabilities of MDC’s subsidiaries that are not Guarantors.

MDC may, at its option, redeem the 6.50% Notes in whole at any time or in part from time to time, on and after May 1, 2019 (i) at a redemption price of 104.875% of the principal amount thereof if redeemed during the twelve-month period beginning on May 1, 2019, (ii) at a redemption price of 103.250% of the principal amount thereof if redeemed during the twelve-month period beginning on May 1, 2020, (iii) at a redemption price of 101.625% of the principal amount thereof if redeemed during the twelve-month period beginning on May 1, 2021, and (iv) at a redemption price of 100% of the principal amount thereof if redeemed on May 1, 2022 and thereafter.

Prior to May 1, 2019, MDC may, at its option, redeem some or all of the 6.50% Notes at a price equal to 100% of the principal amount of the 6.50% Notes plus a “make whole” premium and accrued and unpaid interest. MDC may also redeem, at its option, prior to May 1, 2019, up to 35% of the 6.50% Notes with the proceeds from one or more equity offerings at a redemption price of 106.50% of the principal amount thereof.

If MDC experiences certain kinds of changes of control (as defined in the Indenture), holders of the 6.50% Notes may require MDC to repurchase any 6.50% Notes held by them at a price equal to 101% of the principal amount of the 6.50% Notes plus accrued and unpaid interest. In addition, if MDC sells assets under certain circumstances, it must apply the proceeds from such sale and offer to repurchase the 6.50% Notes at a price equal to 100% of the principal amount plus accrued and unpaid interest.

The Indenture includes covenants that, among other things, restrict MDC’s ability and the ability of its restricted subsidiaries (as defined in the Indenture) to incur or guarantee additional indebtedness; pay dividends on or redeem or repurchase the capital stock of MDC; make certain types of investments; create restrictions on the payment of dividends or other amounts from MDC’s restricted subsidiaries; sell assets; enter into transactions with affiliates; create liens; enter into sale and leaseback transactions; and consolidate or merge with or into, or sell substantially all of MDC’s assets to, another person. These covenants are subject to a number of important limitations and exceptions. The 6.50% Notes are also subject to customary events of default, including a cross-payment default and cross-acceleration provision.

Redemption of 6.75% Notes

On March 23, 2016, the Company redeemed the 6.75% Notes in whole at a redemption price of 103.375% of the principal amount thereof with the proceeds from the issuance of the 6.50% Notes.

Credit Agreement

On March 20, 2013, MDC, Maxxcom Inc. (a subsidiary of MDC) and each of their subsidiaries party thereto entered into an amended and restated, $225,000 senior secured revolving credit agreement due 2018 (the “Credit Agreement”) with Wells Fargo Capital Finance, LLC, as agent, and the lenders from time to time party thereto. Advances under the Credit Agreement are to be used for working capital and general corporate purposes, in each case pursuant to the terms of the Credit Agreement. Capitalized terms used in this section and not otherwise defined have the meanings set forth in the Credit Agreement.

Effective October 23, 2014, MDC and its subsidiaries entered into an amendment to its Credit Agreement. The amendment: (i) expanded the commitments under the facility by $100,000, from $225,000 to $325,000; (ii) extended the date by an additional eighteen months to September 30, 2019; (iii) reduced the base borrowing interest rate by 25 basis points (the applicable margin for borrowing is 1.00% in the case of Base Rate Loans and 1.75% in the case of LIBOR Rate Loans); and (iv) modified certain covenants to provide the Company with increased flexibility to fund its continued growth and other general corporate purposes.

Effective May 3, 2016, MDC and its subsidiaries entered into an additional amendment to its Credit Agreement. The amendment: (i) extends the date by an additional nineteen months to May 3, 2021; (ii) reduces the base borrowing interest rate by 25 basis points; (iii) provides the Company the ability to borrow in foreign currencies; and (iv) certain other modifications to provide additional flexibility in operating the Company’s business.

Advances under the Credit Agreement bear interest as follows: (a)(i) LIBOR Rate Loans bear interest at the LIBOR Rate and (ii) Base Rate Loans bear interest at the Base Rate, plus (b) an applicable margin. The initial applicable margin for borrowing is 1.50% in the case of Base Rate Loans and 1.75% in the case of LIBOR Rate Loans. In addition to paying interest on outstanding principal under the Credit Agreement, MDC is required to pay an unused revolver fee to lenders under the Credit Agreement in respect of unused commitments thereunder.

The Credit Agreement is guaranteed by substantially all of MDC’s present and future subsidiaries, other than immaterial subsidiaries and subject to customary exceptions. The Credit Agreement includes covenants that, among other things, restrict MDC’s ability and the ability of its subsidiaries to incur or guarantee additional indebtedness; pay dividends on or redeem or repurchase the capital stock of MDC; make certain types of investments; impose limitations on dividends or other amounts from MDC’s subsidiaries; incur certain liens, sell or otherwise dispose of certain assets; enter into transactions with affiliates; enter into sale and leaseback transactions; and consolidate or merge with or into, or sell substantially all of MDC’s assets to, another person. These covenants are subject to a number of important limitations and exceptions. The Credit Agreement also contains financial covenants, including a total leverage ratio, a senior leverage ratio, a fixed charge coverage ratio and a minimum earnings level (each as more fully described in the Credit Agreement). The Credit Agreement is also subject to customary events of default.

The Company is currently in compliance with all of the terms and conditions of its Credit Agreement, and management believes, based on its current financial projections, that the Company will be in compliance with the covenants over the next twelve months. At September 30, 2017, there were $48,607 borrowings under the Credit Agreement.

At September 30, 2017, the Company had issued $5,009 of undrawn outstanding letters of credit.

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Convertible Preference Shares (Notes)

9 Months Ended

Sep. 30, 2017

Convertible Preference Shares [Abstract]

Convertible Preference Shares

On March 7, 2017 (the “Issue Date”), the Company issued 95,000 newly created Preference Shares to affiliates of The Goldman Sachs Group, Inc. (collectively, the “Purchaser”) pursuant to a $95,000 private placement. The Company received proceeds of approximately $90,220, net of fees and estimated expenses, which were primarily used to pay down existing debt under the Company’s credit facility and for general corporate purposes. In connection with the closing of the transaction, effective March 7, 2017, the Company increased the size of its Board of Directors (the “Board”) to seven members and appointed one nominee designated by the Purchaser. Except as required by law, the Preference Shares do not have voting rights, and are not redeemable at the option of the Purchaser.

The holders of the Preference Shares have the right to convert their Preference Shares in whole at any time and from time to time, and in part at any time and from time to time after the ninetieth day following the original issuance date of the Preference Shares, into a number of Class A Shares equal to the then-applicable liquidation preference divided by the applicable conversion price at such time (the “Conversion Price”). The initial liquidation per share preference of each Preference Share is $1,000. The initial Conversion Price will be $10.00 per Preference Share, subject to customary adjustments for share splits and combinations, dividends, recapitalizations and other matters, including weighted average anti-dilution protection for certain issuances of equity or equity-linked securities.

The Preference Shares’ liquidation preference accretes at 8.0% per annum, compounded quarterly until the five-year anniversary of the Issue Date. During the nine months ended September 30, 2017, the Preference Shares accreted at a monthly rate of approximately $6.84 per Preference Share, for total accretion of $4,365, bringing the aggregate liquidation preference to $99,365 as of September 30, 2017. The accretion is considered in the calculation of net income (loss) attributable to MDC Partners Inc. common shareholders. See Notes 2 and 3.

Holders of the Preference Shares are entitled to dividends in an amount equal to any dividends that would otherwise have been payable on the Class A Shares issued upon conversion of the Preference Shares. The Preference Shares are convertible at the Company’s option (i) on and after the two-year anniversary of the Issue Date, if the closing trading price of the Class A Shares over a specified period prior to conversion is at least 125% of the Conversion Price or (ii) after the fifth anniversary of the Issue Date, if the closing trading price of the Class A Shares over a specified period prior to conversion is at least equal to the Conversion Price.

Following certain change in control transactions of the Company in which holders of Preference Shares are not entitled to receive cash or qualifying listed securities with a value at least equal to the liquidation preference plus accrued and unpaid dividends, (i) holders will be entitled to cash dividends on the liquidation preference at an increasing rate (beginning at 7%), and (ii) the Company will have a right to redeem the Preference Shares for cash at the greater of their liquidation preference plus accrued and unpaid dividends or their as-converted value.

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Other Income

9 Months Ended

Sep. 30, 2017

Other Income and Expenses [Abstract]

Other Nonoperating Income and Expense [Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Other income (expense)	$	(7	)	$	26		$	271		$	(220	)
Loss on sale of business (1)	(1,424		)	(800		)	(1,424		)	(800		)
Gain on sale of investments (2)	168			682			168			682
Foreign currency transaction gain (loss)	9,912			(5,916		)	18,797			9,868
	$	8,649		$	(6,008	)	$	17,812		$	9,530

(1) During the three months ended September 30, 2017, the Company sold all of its ownership interests in three subsidiaries resulting in recognition of a net loss on sale of business of $1,424. See Note 4 for further information.

Effective September 30, 2016, the Company sold all of its ownership interests in Bryan Mills to the noncontrolling shareholders and recognized a loss of $800.

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Commitments, Contingencies and Guarantees

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments, Contingencies and Guarantees

Deferred Acquisition Consideration. In addition to the consideration paid by the Company in respect of certain of its acquisitions at closing, additional consideration may be payable, or may be potentially payable based on the achievement of certain threshold levels of earnings. See Notes 2, 4, and 9.

Options to purchase. Noncontrolling shareholders in certain subsidiaries have the right in certain circumstances to require the Company to acquire the remaining ownership interests held by them. The noncontrolling shareholders’ ability to exercise any such option right is subject to the satisfaction of certain conditions, including conditions requiring notice in advance of exercise and specific employment termination conditions. In addition, these rights cannot be exercised prior to specified staggered exercise dates. The exercise of these rights at their earliest contractual date would result in obligations of the Company to fund the related amounts during the remainder of 2017 to 2023. It is not determinable, at this time, if or when the owners of these rights will exercise all or a portion of these rights.

The amount payable by the Company in the event such rights are exercised is dependent on various valuation formulas and on future events, such as the average earnings of the relevant subsidiary through the date of exercise, the growth rate of the earnings of the relevant subsidiary during that period and, in some cases, the currency exchange rate at the date of payment.

Management estimates, assuming that the subsidiaries owned by the Company at September 30, 2017, perform over the relevant future periods at their trailing twelve-months earnings levels, that these rights, if all exercised, could require the Company, in future periods, to pay an aggregate amount of approximately $15,493 to the owners of such rights to acquire such ownership interests in the relevant subsidiaries. Of this amount, the Company is entitled, at its option, to fund approximately $202 by the issuance of share capital.

In addition, the Company is obligated under similar contractual rights to pay an aggregate amount of approximately $42,268 only upon termination of such owner’s employment with the applicable subsidiary or death.

The amount the Company would be required to pay to the noncontrolling interest holders should the Company acquire the remaining ownership interests is $2,330 less than the initial redemption value recorded in redeemable noncontrolling interests.

Included in redeemable noncontrolling interests at September 30, 2017 was $60,092 of these options to purchase because they are not within the control of the Company. The ultimate amount payable relating to these transactions will vary because it is dependent on the future results of operations of the subject businesses and the timing of when these rights are exercised.

Natural Disasters. Certain of the Company’s operations are located in regions of the United States which typically are subject to hurricanes. During the nine months ended September 30, 2017 and 2016, these operations did not incur any costs related to damages resulting from hurricanes.

Guarantees. Generally, the Company has indemnified the purchasers of certain assets in the event that a third party asserts a claim against the purchaser that relates to a liability retained by the Company. These types of indemnification guarantees typically extend for a number of years. Historically, the Company has not made any significant indemnification payments under such agreements and no amount has been accrued in the accompanying consolidated financial statements with respect to these indemnification guarantees. The Company continues to monitor the conditions that are subject to guarantees and indemnifications to identify whether it is probable that a loss has occurred, and would recognize any such losses under any guarantees or indemnifications in the period when those losses are probable and estimable.

Legal Proceedings. The Company’s operating entities are involved in legal proceedings of various types. While any litigation contains an element of uncertainty, the Company has no reason to believe that the outcome of such proceedings or claims will have a material adverse effect on the financial condition or results of operations of the Company. In addition, the Company is involved in class action suits as described below.

Class Action Litigation in Canada. On August 7, 2015, Roberto Paniccia issued a Statement of Claim in the Ontario Superior Court of Justice in the City of Brantford, Ontario seeking to certify a class action suit naming the following as defendants: MDC, former CEO Miles S. Nadal, former CAO Michael C. Sabatino, CFO David Doft and BDO U.S.A. LLP. The Plaintiff alleges violations of section 138.1 of the Ontario Securities Act (and equivalent legislation in other Canadian provinces and territories) as well as common law misrepresentation based on allegedly materially false and misleading statements in the Company’s public statements, as well as omitting to disclose material facts with respect to the SEC investigation. The Company intends to continue to vigorously defend this Canadian suit on the same basis as which the U.S. class action was previously dismissed. A first case management meeting has been held. The plaintiff has served his material for leave to proceed under the Securities Act. MDC and the other defendants have served a motion to limit the scope of the proposed class definition to Canadian residents who purchased and sold shares of MDC stock on the Toronto Stock Exchange. Those motions are returnable in the fourth quarter of 2017.

Antitrust Subpoena. One of the Company’s subsidiaries received a subpoena from the U.S. Department of Justice Antitrust Division concerning the Division’s ongoing investigation of production practices in the advertising industry. The Company and its subsidiary are fully cooperating with this confidential investigation.

Commitments.  At September 30, 2017, the Company had issued $5,009 of undrawn outstanding letters of credit. In addition, the Company has commitments to fund investments in an aggregate amount of $198.

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New Accounting Pronouncements

9 Months Ended

Sep. 30, 2017

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Pronouncements

In May 2017, the FASB issued Accounting Standards Update (“ASU”) 2017-09, Compensation - Stock Compensation: Scope of Modification Accounting, which provides guidance concerning which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in ASC 718.  This guidance is effective for annual and interim periods beginning after December 15, 2017, and early adoption is permitted. Amendments in this ASU will be applied prospectively to any award modified on or after the adoption date.  The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits, which requires the presentation of the service cost component of the net periodic pension and postretirement benefits costs in the same line item in the statement of operations as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of the net periodic pension and postretirement benefits costs are required to be presented as non-operating expenses in the statement of operations. This guidance is effective for annual periods beginning after December 15, 2017 and early adoption is permitted. The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other: Simplifying the Test for Goodwill Impairment, which eliminates step two from the two-step goodwill impairment test. Under the new guidance, an entity will perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value provided the loss recognized does not exceed the total amount of goodwill allocated to that reporting unit. This guidance is effective for annual or interim goodwill impairment tests performed in fiscal years beginning after December 15, 2019. The Company will early adopt this guidance for our impairment test performed during 2017, and does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows. This new guidance is intended to reduce diversity in practice regarding the classification of certain transactions in the statement of cash flows. This guidance is effective January 1, 2018 and requires a retrospective transition method. Early adoption is permitted. The Company currently classifies all cash outflows for contingent consideration as a financing activity. Upon adoption the Company is required to classify only the original estimated liability as a financing activity and any changes as an operating activity.

In February 2016, the FASB issued ASU 2016-02, which amends the ASC and creates Topic 842, Leases. Topic 842 will require lessees to recognize right-to-use assets and lease liabilities for those leases classified as operating leases under previous U.S. GAAP on the balance sheet. This guidance is effective for annual periods beginning after December 15, 2018 and early adoption is permitted. While not yet in a position to assess the full impact of the application of the new standard, the Company expects that the impact of recording the lease liabilities and the corresponding right-to-use assets will have a significant impact on its total assets and liabilities with a minimal impact on equity.

In January 2016, the FASB issued ASU 2016-01,Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Liabilities, which will require equity investments, except equity method investments, to be measured at fair value and any changes in fair value will be recognized in results of operations. This guidance is effective for annual and interim periods beginning after December 15, 2017 and early application is not permitted. Additionally, this guidance provides for the recognition of the cumulative effect of retrospective application of the new standard in the period of initial application. The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which will replace all existing revenue guidance under U.S GAAP. The core principle of ASU 2014-09 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration expected to be received in exchange for those goods or services. On July 9, 2015, the FASB approved a one year deferral of the effective date of ASU 2014-09 to all annual and interim periods beginning after December 15, 2017. ASU 2014-09 provides for one of two methods of transition: (i) retrospective application to each prior period presented (Full Retrospective); or (ii) recognition of the cumulative effect of retrospective application of the new standard as of the beginning of the period of initial application (Modified Retrospective). The Company plans to apply ASU 2014-09 on the effective date of January 1, 2018, and intends to apply the Modified Retrospective method. Based on the Company’s assessment, the application of the new standard will result in a change in the timing of our revenue recognition within certain of the Company’s arrangements. Performance incentives are currently recognized in revenue when specific quantitative goals are achieved, or when the Company’s performance against qualitative goals is determined by the client. Under the new standard, the Company will be required to estimate the amount of the incentive that will be earned at the inception of the contract and recognize such incentive over the term of the contract. While performance incentives are not material to the Company’s revenue, this will result in an acceleration of revenue recognition for certain contract incentives compared to the current method. Further, based on the Company’s initial assessment, it is expected that an input measure such as cost to cost or labor hours would be an appropriate measure of progress in the majority of situations for which over time revenue recognition is applied.

Furthermore, in certain businesses, the Company records revenue as a principal and includes certain third-party-pass-through and out-of-pocket costs, which are billed to clients in connection with the services provided. In March 2016, the FASB issued further guidance on principal versus agent considerations; however, our initial assessments indicate that such change is not expected to have a material effect on the Company’s results of operations. The Company is continuing to evaluate the standard’s impact on the consolidated results of operations and financial condition, and the related disclosure requirements.

New Accounting Pronouncements, Policy [Policy Text Block]

In May 2017, the FASB issued Accounting Standards Update (“ASU”) 2017-09, Compensation - Stock Compensation: Scope of Modification Accounting, which provides guidance concerning which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in ASC 718.  This guidance is effective for annual and interim periods beginning after December 15, 2017, and early adoption is permitted. Amendments in this ASU will be applied prospectively to any award modified on or after the adoption date.  The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits, which requires the presentation of the service cost component of the net periodic pension and postretirement benefits costs in the same line item in the statement of operations as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of the net periodic pension and postretirement benefits costs are required to be presented as non-operating expenses in the statement of operations. This guidance is effective for annual periods beginning after December 15, 2017 and early adoption is permitted. The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other: Simplifying the Test for Goodwill Impairment, which eliminates step two from the two-step goodwill impairment test. Under the new guidance, an entity will perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value provided the loss recognized does not exceed the total amount of goodwill allocated to that reporting unit. This guidance is effective for annual or interim goodwill impairment tests performed in fiscal years beginning after December 15, 2019. The Company will early adopt this guidance for our impairment test performed during 2017, and does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows. This new guidance is intended to reduce diversity in practice regarding the classification of certain transactions in the statement of cash flows. This guidance is effective January 1, 2018 and requires a retrospective transition method. Early adoption is permitted. The Company currently classifies all cash outflows for contingent consideration as a financing activity. Upon adoption the Company is required to classify only the original estimated liability as a financing activity and any changes as an operating activity.

In February 2016, the FASB issued ASU 2016-02, which amends the ASC and creates Topic 842, Leases. Topic 842 will require lessees to recognize right-to-use assets and lease liabilities for those leases classified as operating leases under previous U.S. GAAP on the balance sheet. This guidance is effective for annual periods beginning after December 15, 2018 and early adoption is permitted. While not yet in a position to assess the full impact of the application of the new standard, the Company expects that the impact of recording the lease liabilities and the corresponding right-to-use assets will have a significant impact on its total assets and liabilities with a minimal impact on equity.

In January 2016, the FASB issued ASU 2016-01,Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Liabilities, which will require equity investments, except equity method investments, to be measured at fair value and any changes in fair value will be recognized in results of operations. This guidance is effective for annual and interim periods beginning after December 15, 2017 and early application is not permitted. Additionally, this guidance provides for the recognition of the cumulative effect of retrospective application of the new standard in the period of initial application. The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which will replace all existing revenue guidance under U.S GAAP. The core principle of ASU 2014-09 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration expected to be received in exchange for those goods or services. On July 9, 2015, the FASB approved a one year deferral of the effective date of ASU 2014-09 to all annual and interim periods beginning after December 15, 2017. ASU 2014-09 provides for one of two methods of transition: (i) retrospective application to each prior period presented (Full Retrospective); or (ii) recognition of the cumulative effect of retrospective application of the new standard as of the beginning of the period of initial application (Modified Retrospective). The Company plans to apply ASU 2014-09 on the effective date of January 1, 2018, and intends to apply the Modified Retrospective method. Based on the Company’s assessment, the application of the new standard will result in a change in the timing of our revenue recognition within certain of the Company’s arrangements. Performance incentives are currently recognized in revenue when specific quantitative goals are achieved, or when the Company’s performance against qualitative goals is determined by the client. Under the new standard, the Company will be required to estimate the amount of the incentive that will be earned at the inception of the contract and recognize such incentive over the term of the contract. While performance incentives are not material to the Company’s revenue, this will result in an acceleration of revenue recognition for certain contract incentives compared to the current method. Further, based on the Company’s initial assessment, it is expected that an input measure such as cost to cost or labor hours would be an appropriate measure of progress in the majority of situations for which over time revenue recognition is applied.

Furthermore, in certain businesses, the Company records revenue as a principal and includes certain third-party-pass-through and out-of-pocket costs, which are billed to clients in connection with the services provided. In March 2016, the FASB issued further guidance on principal versus agent considerations; however, our initial assessments indicate that such change is not expected to have a material effect on the Company’s results of operations. The Company is continuing to evaluate the standard’s impact on the consolidated results of operations and financial condition, and the related disclosure requirements.

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Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Subsidiary and Equity Investment Stock Transaction, Policy [Policy Text Block]

Subsidiary and Equity Investment Stock Transactions. Transactions involving the purchase, sale or issuance of stock of a subsidiary where control is maintained are recorded as a reduction in the redeemable noncontrolling interests or noncontrolling interests, as applicable. Any difference between the purchase price and noncontrolling interest are recorded to additional paid-in capital. In circumstances where the purchase of shares of an equity investment results in obtaining control, the existing carrying value of the investment is remeasured to the acquisition date fair value and any gain or loss is recognized in results of operations.

Earnings Per Share, Policy [Policy Text Block]

Income (Loss) per Common Share.  Basic income (loss) per common share is based upon the weighted average number of common shares outstanding during each period. Share capital to be issued, as reflected in shareholders’ deficit on the balance sheet, are also included if there is no circumstance under which those shares would not be issued. Diluted income (loss) per common share is based on the above, in addition, if dilutive, it also includes common share equivalents, which include outstanding options, stock appreciation rights, and unvested restricted stock units. In periods of net loss, all potentially issuable common shares are excluded from diluted net loss per common share because they are anti-dilutive.

During the first quarter of 2017, the Company issued and sold 95,000 newly authorized Series 4 Convertible Preference Shares (the “Preference Shares”) in a private placement. The two-class method is applied to calculate basic net income (loss) attributable to MDC Partners, Inc. per common share in periods in which shares of convertible preference shares were outstanding, as shares of convertible preference shares are participating securities due to their dividend rights. See Notes 7 and 8. The two-class method is an earnings allocation method under which earnings per share is calculated for common stock considering a participating security’s rights to undistributed earnings as if all such earnings had been distributed during the period. Either the two-class method or the if-converted method is applied to calculate diluted net income per common share, depending on which method results in more dilution. The Company’s participating securities are not included in the computation of net loss per common share in periods of net loss because the convertible preference shareholders have no contractual obligation to participate in losses.

As of September 30, 2017, options and other rights to purchase 1,118,085 shares of common stock were outstanding, of which 741,712 and 805,413 shares of non-vested restricted stock and restricted stock units were anti-dilutive during the three and nine months ended September 30, 2017, respectively, and therefore excluded from the computation of diluted income per common share. Additionally, 1,443,921 shares of non-vested restricted stock and restricted stock unit awards, which are contingent upon the Company meeting an undefined cumulative three year earnings target and continued employment, are excluded from the computation of diluted income per common share as the contingency has not been satisfied at September 30, 2017. Lastly, there were 95,000 shares of Preference Shares outstanding which were convertible into 9,936,514 Class A common shares at September 30, 2017. These Preference Shares were anti-dilutive for the three and nine months ended September 30, 2017, and are therefore excluded from the diluted loss per common share calculation for the period.

As of September 30, 2016, options and other rights to purchase 918,260 shares of common stock were outstanding, of which 880,760 shares of non-vested restricted stock and restricted stock units were anti-dilutive during the three and nine months ended September 30, 2016 and therefore excluded from the computation of diluted income per common share. Additionally, 523,321 shares of non-vested restricted stock and restricted stock unit awards, which are contingent upon the Company meeting an undefined cumulative three year earnings target and continued employment, are excluded from the computation of diluted income per common share as the contingency had not been satisfied as of September 30, 2016.

Foreign Currency Transactions and Translations Policy [Policy Text Block]

Foreign Currency Translation.  The Company’s financial statements were prepared in accordance with the requirements of FASB ASC Topic 830, Foreign Currency Matters. The functional currency of the Company is the Canadian dollar and it has decided to use U.S. dollars as its reporting currency for consolidated reporting purposes. Generally, the Company’s subsidiaries use their local currency as their functional currency. Accordingly, the currency impacts of the translation of the balance sheets of the Company’s non-U.S. dollar based subsidiaries to U.S. dollar statements are included as cumulative translation adjustments in accumulated other comprehensive income. Translation of intercompany debt, which is not intended to be repaid, is included in cumulative translation adjustments. Cumulative translation adjustments are not included in net earnings unless they are actually realized through a sale or upon complete or substantially complete liquidation of the Company’s net investment in the foreign operation. Translation of current intercompany balances are included in net earnings. The balance sheets of non-U.S. dollar based subsidiaries are translated at the period end rate. The income statements of non-U.S. dollar based subsidiaries are translated at average exchange rates for the period.

Gains and losses arising from the Company’s foreign currency transactions are reflected in net earnings. Unrealized gains or losses arising on the translation of certain intercompany foreign currency transactions that are of a long-term nature (that is settlement is not planned or anticipated in the future) are included as cumulative translation adjustments in accumulated other comprehensive loss.

Guarantees, Indemnifications and Warranties Policies [Policy Text Block]

Guarantees.  Guarantees issued or modified by the Company to third parties after January 1, 2003 are generally recognized at the inception or modification of the guarantee as a liability for the obligations it has undertaken in issuing the guarantee, including its ongoing obligation to stand ready to perform over the term of the guarantee in the event that the specified triggering events or conditions occur. The initial measurement of that liability is the fair value of the guarantee. The recognition of a liability is required even if it is not probable that payments will be required under a guarantee. The Company’s liability associated with guarantees is not significant. See Note 12.

Premiums Receivable, Allowance for Doubtful Accounts, Estimation Methodology, Policy [Policy Text Block]

Allowance for Doubtful Accounts.  Trade receivables are stated at invoiced amounts less allowances for doubtful accounts. The allowances represent estimated uncollectible receivables associated with potential customer defaults usually due to customers’ potential insolvency. The allowances include amounts for certain customers where a risk of default has been specifically identified. The assessment of the likelihood of customer defaults is based on various factors, including the length of time the receivables are past due, historical experience and existing economic conditions.

Expenditures Billable To Clients, Policy [Policy Text Block]

Expenditures Billable to Clients.  Expenditures billable to clients consist principally of outside vendor costs incurred on behalf of clients when providing advertising, marketing and corporate communications services that have not yet been invoiced to clients. Such amounts are invoiced to clients at various times over the course of the production process.

Property, Plant and Equipment, Policy [Policy Text Block]

Fixed Assets.  Fixed assets are stated at cost, net of accumulated depreciation. Computers, furniture and fixtures are depreciated on a straight-line basis over periods of three to seven years. Leasehold improvements are depreciated on a straight-line basis over the lesser of the term of the related lease or the estimated useful life of the asset. Repairs and maintenance costs are expensed as incurred.

Equity Method Investments [Policy Text Block]

Equity Method Investments. The equity method is used to account for investments in entities in which the Company has an ownership interest of less than 50% and has significant influence, or joint control by contractual arrangement, (i) over the operating and financial policies of the affiliate or (ii) has an ownership interest greater than 50%; however, the substantive participating rights of the noncontrolling interest shareholders preclude the Company from exercising unilateral control over the operating and financial policies of the affiliate. The Company’s investments that were accounted for using the equity method include a 30% undivided interest in a real estate joint venture and various interests in investment funds. The Company’s management periodically evaluates these investments to determine if there has been a decline in value that is other than temporary. These investments are included in investments in non-consolidated affiliates on the balance sheet.

Principles of Consolidation

Principles of Consolidation. The accompanying condensed consolidated financial statements include the accounts of MDC Partners Inc. and its domestic and international controlled subsidiaries that are not considered variable interest entities, and variable interest entities for which the Company is the primary beneficiary. Intercompany balances and transactions have been eliminated in consolidation.

Reclassification, Policy [Policy Text Block]

Reclassifications. Certain reclassifications have been made to the prior period financial statements to conform to the current period presentation. During the nine months ended September 30, 2017, the Company changed the presentation of book overdrafts on its statement of cash flows to classify the associated cash flows as operating activities. Book overdrafts were previously presented within financing activities. This resulted in cash inflows of $17,532 being reclassified from financing activities to operating activities for the nine months ended September 30, 2016. There was no impact on the Company’s consolidated statements of operations, comprehensive income (loss), or balance sheets.

Use of Estimates, Policy

Use of Estimates. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities including goodwill, intangible assets, contingent deferred acquisition consideration, valuation allowances for receivables, deferred tax assets and the amounts of revenue and expenses reported during the period. These estimates are evaluated on an ongoing basis and are based on historical experience, current conditions and various other assumptions believed to be reasonable under the circumstances. Actual results could differ from these estimates.

Fair Value

Fair Value. The Company applies the fair value measurement guidance of the Financial Accounting Standards Board (the “FASB”) Accounting Standards Codification (the “ASC”) Topic 820, Fair Value Measurements, for financial assets and liabilities that are required to be measured at fair value and for non-financial assets and liabilities that are not required to be measured at fair value on a recurring basis, including goodwill and other identifiable intangible assets. The measurement of fair value requires the use of techniques based on observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect market assumptions. The inputs create the following fair value hierarchy:

• Level 1 - Quoted prices for identical instruments in active markets.

• Level 2 - Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations where inputs are observable or where significant value drivers are observable.

• Level 3 - Instruments where significant value drivers are unobservable to third parties.

When available, the Company uses quoted market prices to determine the fair value of its financial instruments and classifies such items in Level 1. In some cases, quoted market prices are used for similar instruments in active markets and the Company classifies such items in Level 2.

Concentration of Credit Risk

Concentration of Credit Risk. The Company provides marketing communications services to clients who operate in most industry sectors. Credit is granted to qualified clients in the ordinary course of business. Due to the diversified nature of the Company’s client base, the Company does not believe that it is exposed to a concentration of credit risk. No client accounted for more than 10% of the Company’s consolidated accounts receivable at September 30, 2017 and December 31, 2016. No client accounted for 10% of the Company’s revenue for the three and nine months ended September 30, 2017 or the three and nine months ended September 30, 2016.

Cash and Cash Equivalents

Cash and Cash Equivalents. The Company’s cash equivalents are primarily comprised of investments in overnight interest-bearing deposits, commercial paper and money market instruments and other short-term investments with original maturity dates of three months or less at the time of purchase. The Company has a concentration of credit risk in that there are cash deposits in excess of federally insured amounts.

Cash in Trust, Policy [Policy Text Block]

Cash in Trust. A subsidiary of the Company holds restricted cash in trust accounts related to funds received on behalf of clients.  Such amounts are held in escrow under depositary service agreements and distributed at the direction of the clients.  The funds are presented as a corresponding liability on the balance sheet.

Cost Method Investments, Policy

Cost Method Investments. From time to time, the Company makes non-material cost based investments in start-up advertising technology companies and innovative consumer product companies where the Company does not exercise significant influence over the operating and financial policies of the investee. The total net cost basis of these investments, which is included in other assets on the balance sheet as of September 30, 2017 and December 31, 2016, was $10,350 and $10,132, respectively. These investments are periodically evaluated to determine whether a significant event or change in circumstances has occurred that may impact the fair value of each investment other than temporary declines below book value. A variety of factors are considered when determining if a decline is other than temporary, including, among others, the financial condition and prospects of the investee, as well as the Company’s investment intent.  In addition, the Company’s partner agencies may receive minority equity interests from start-up companies in lieu of fees.

Business Combinations

Business Combinations. Business combinations are accounted for using the acquisition method and accordingly, the assets acquired (including identified intangible assets), the liabilities assumed and any noncontrolling interest in the acquired business are recorded at their acquisition date fair values. The Company’s acquisition model typically provides for an initial payment at closing and for future additional contingent purchase price obligations. Contingent purchase price obligations are recorded as deferred acquisition consideration on the balance sheet at the acquisition date fair value and are remeasured at each reporting period. Changes in such estimated values are recorded in the results of operations. For further information see Notes 4 and 9. For the three and nine months ended September 30, 2017 and 2016, $2,462 of income and $12,152 of expense, respectively, and $11,152 and $17,180 of expense, respectively, related to changes in such estimated values and was recorded in results of operations. The Company expenses acquisition related costs as incurred. For the three and nine months ended September 30, 2017 and 2016, $216 and $693 respectively, and $806 and $2,266, respectively, of acquisition related costs were charged to operations.

For each acquisition, the Company undertakes a detailed review to identify intangible assets and a valuation is performed for all such identified assets. The Company uses several market participant measurements to determine the estimated value. This approach includes consideration of similar and recent transactions, as well as utilizing discounted expected cash flow methodologies. Like most service businesses, a substantial portion of the intangible asset value that the Company acquires is the specialized know-how of the workforce, which is treated as part of goodwill and is not required to be valued separately. The majority of the value of the identifiable intangible assets acquired is derived from customer relationships, including the related customer contracts, as well as trade names. In executing the Company’s overall acquisition strategy, one of the primary drivers in identifying and executing a specific transaction is the existence of, or the ability to expand the existing, client relationships. The expected benefits of the Company’s acquisitions are typically shared across multiple agencies and regions.

Redeemable Noncontrolling Interest

Redeemable Noncontrolling Interests. Many of the Company’s acquisitions include contractual arrangements where the noncontrolling shareholders have an option to purchase, or may require the Company to purchase, such noncontrolling shareholders’ incremental ownership interests under certain circumstances and the Company has similar call options under the same contractual terms. The amount of consideration under these contractual arrangements is not a fixed amount, but rather is dependent upon various valuation formulas as described in Note 12. In the event that an incremental purchase may be required of the Company, the amounts are recorded as redeemable noncontrolling interests in mezzanine equity on the balance sheet at their acquisition date fair value and adjusted for changes to their estimated redemption value through additional paid-in capital (but not less than their initial redemption value), except for foreign currency translation adjustments. These adjustments will not impact the calculation of earnings (loss) per share if the redemption values are less than the estimated fair values.

For the three and nine months ended September 30, 2017 and 2016, there was no related impact on the Company’s earnings (loss) per share calculation.  Changes in the estimated redemption amounts of the redeemable noncontrolling interests are adjusted at each reporting period with a corresponding adjustment to equity. These adjustments will not impact the calculation of earnings (loss) per share.

The following table presents changes in redeemable noncontrolling interests:

	Nine Months Ended September 30, 2017			Year Ended December 31, 2016
Beginning Balance	$	60,180		$	69,471
Redemptions	(816		)	(1,708		)
Additions (1)	—			2,274
Changes in redemption value	299			(9,604		)
Currency translation adjustments	429			(253		)
Ending Balance	$	60,092		$	60,180

(1) Additions consist of transfers from noncontrolling interests related to step-up transactions and new acquisitions.

Variable Interest Entity

Variable Interest Entity. Effective March 28, 2012, the Company invested in Doner Partners LLC (“Doner”). The Company acquired a 30% voting interest and convertible preferred interests that allow the Company to increase ordinary voting ownership to 70% at the Company’s option. Effective April 1, 2017, the Company acquired an additional 15% voting and convertible preferred interest that allowed the Company to increase ordinary voting ownership to 85% at the Company’s option. The Company now has a 45% voting interest. The Company has determined that (i) this entity is a variable interest entity, and (ii) the Company is the primary beneficiary because it receives a disproportionate share of profits and losses as compared to its ownership percentage. As such, Doner is consolidated for all periods subsequent to the date of investment.

Doner is a full service integrated creative agency that is included as part of the Company’s portfolio in the Global Integrated Agencies segment. The Company’s Credit Agreement (see Note 6) is guaranteed and secured by all of Doner’s assets.

Total assets and total liabilities of Doner included in the Company’s consolidated balance sheet at September 30, 2017 were $100,229 and $53,508, respectively, and at December 31, 2016 were $102,456 and $57,622, respectively.

Revenue Recognition

Revenue Recognition. The Company’s revenue recognition policies are established in accordance with the Revenue Recognition topics of the FASB ASC, and accordingly, revenue is recognized when all of the following criteria are satisfied: (i) persuasive evidence of an arrangement exists; (ii) the selling price is fixed or determinable; (iii) services have been performed or upon delivery of the products when ownership and risk of loss has transferred to the client; and (iv) collection of the resulting receivable is reasonably assured.

The Company follows the Multiple-Element Arrangement topic of the FASB ASC, which addresses certain aspects of the accounting by a vendor for arrangements under which it will perform multiple revenue-generating activities and how to determine whether an arrangement involving multiple deliverables contains more than one unit of accounting.

The Company follows the Principal Agent Consideration topic of the FASB ASC which addresses (i) whether revenue should be recorded at the gross amount billed because it has earned revenue from the sale of goods or services, or recorded at the net amount retained because it has earned a fee or commission, and (ii) that reimbursements received for out-of-pocket expenses incurred should be characterized in the income statement as revenue. Accordingly, the Company has included such reimbursed expenses in revenue.

The Company earns revenue from agency arrangements in the form of retainer fees or commissions; from short-term project arrangements in the form of fixed fees or per diem fees for services; and from incentives or bonuses.

Non-refundable retainer fees are generally recognized on a straight-line basis over the term of the specific customer arrangement. Commission revenue is earned and recognized upon the placement of advertisements in various media when the Company has no further performance obligations. Fixed fees for services are recognized upon completion of the earnings process and acceptance by the client. Per diem fees are recognized upon the performance of the Company’s services. In addition, for a limited number of certain service transactions, which require delivery of a number of service acts, the Company uses the proportional performance model, which generally results in revenue being recognized based on the straight-line method.

For arrangements with customers for which the Company earns a fixed fee for development of customized mobile applications (“Apps”), revenue is recognized in accordance with the accounting guidance contained in ASC 605-35 and is primarily recognized using the proportional performance method of accounting. Performance is generally measured based upon the efforts incurred to date in relation to total estimated efforts to the completion of the contract.

Fees billed to clients in excess of fees recognized as revenue are classified as advanced billings on the Company’s balance sheet.

A small portion of the Company’s contractual arrangements with customers includes performance incentive provisions, which allow the Company to earn additional revenue as a result of its performance relative to both quantitative and qualitative goals. The Company recognizes the incentive portion of revenue under these arrangements when specific quantitative goals are assured, or when the Company’s clients determine performance against qualitative goals has been achieved. In all circumstances, revenue is only recognized when collection is reasonably assured. The Company records revenue net of sales and other taxes due to be collected and remitted to governmental authorities.

Cost of Services Sold [Policy Text Block]

Cost of Services Sold.  Cost of services sold do not include depreciation charges for fixed assets.

Interest Expense

Interest Expense. Interest expense primarily consists of the cost of borrowing on the Company’s previously outstanding 6.75% Senior Notes due 2020 (the “6.75% Notes”); the Company’s currently outstanding 6.50% senior unsecured notes due 2024 (the “6.50% Notes”); and the Company’s $325 million senior secured revolving credit agreement due 2021 (the “Credit Agreement”). The Company uses the effective interest method to amortize the deferred financing costs on the 6.75% Notes and the 6.50% Notes as well as the original issue premium on the previously outstanding 6.75% Notes. The Company also uses the straight-line method to amortize the deferred financing costs on the Credit Agreement. For the three and nine months ended September 30, 2017 and 2016, interest expense included $24 and $77, respectively, and $30 and $181, respectively, relating to present value adjustments for fixed deferred acquisition consideration payments.

The Company redeemed the 6.75% Notes with the net proceeds from the issuance of the 6.50% Notes. For further information see Note 6.

Income Tax

Income Taxes. The Company’s U.S. operating units are generally structured as limited liability companies, which are treated as partnerships for tax purposes. The Company is only taxed on its share of the profits, while noncontrolling holders are responsible for taxes on their share of the profits. Deferred income taxes reflect the tax effects of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes, as well as the tax effect of carryforwards. The Company currently has a fully reserved valuation allowance on its deferred tax assets related to U.S. net operating losses. Realization of our deferred tax assets is evaluated on a quarterly basis and is based upon all available evidence. It is possible that sufficient positive evidence to support the realization of the Company’s net deferred tax assets will exist in the near future, and the previously provided valuation allowance could be reversed in whole or in part.

During the nine months ended September 30, 2017 and 2016, the Company’s effective tax rate was impacted by losses in certain tax jurisdictions where a valuation allowance was deemed necessary.

During the second quarter of 2017, the Company identified and recorded out-of-period adjustments related to the misapplication of ASC 740 and ASC 850-740 accounting policies as they applied to the calculation of deferred tax liabilities.  The corrections have resulted in a $6,916 increase to the Company’s deferred tax liability on the condensed consolidated balance sheet as of December 31, 2016. The Company has performed a qualitative and quantitative analysis of this misapplication and determined it not to be material to prior periods. The Company has revised prior period information presented on this Form 10-Q as follows: (i) for the three and nine months ended September 30, 2016, income tax expense has been decreased by $1,390 and decreased by $713, respectively, (ii) basic and diluted net loss attributable to MDC Partners Inc. common shareholders for the nine months ended September 30, 2016 increased by $0.01 per share, and (iii) deferred tax liabilities and accumulated deficit increased by $6,916 as of December 31, 2016. The correction had no impact on the Company’s cash flows.

Share-based Compensation

Stock-Based Compensation.  Under the fair value method, compensation cost is measured at fair value at the date of grant and is expensed over the service period, in this case the award’s vesting period. The Company recognizes forfeitures as they occur. When awards are exercised, share capital is credited by the sum of the consideration paid, together with the related portion previously credited to additional paid-in capital when compensation costs were charged against income or acquisition consideration.

The Company uses its historical volatility derived over the expected term of the award to determine the volatility factor used in determining the fair value of the award.

Stock-based awards that are settled in cash, or may be settled in cash at the option of employees, are recorded as liabilities. The measurement of the liability and compensation cost for these awards is based on the fair value of the award, and is recorded in operating income over the service period, in this case the award’s vesting period. Changes in the Company’s payment obligation prior to the settlement date of a stock-based award are recorded as compensation cost in operating income in the period of the change. The final payment amount for such awards is established on the date of the exercise of the award by the employee.

Stock-based awards that are settled in cash or equity at the option of the Company are recorded at fair value on the date of grant and recorded as additional paid-in capital. The fair value measurement of the compensation cost for these awards is based on using the Black-Scholes option pricing-model and is recorded in operating income over the service period, in this case the award’s vesting period.

It is the Company’s policy for issuing shares upon the exercise and/or vesting of an equity incentive award to verify the amount of shares to be issued, as well as the amount of proceeds to be collected (if any) and to deliver new shares to the exercising party.

The Company has adopted the straight-line attribution method for determining the compensation cost to be recorded during each accounting period. The Company commences recording compensation expense related to awards that are based on performance conditions under the straight-line attribution method when it is probable that such performance conditions will be met.

The Company treats benefits paid by shareholders or equity members to employees as a stock-based compensation charge with a corresponding credit to additional paid-in-capital.

From time to time, certain acquisitions and step-up transactions include an element of compensation related payments. The Company accounts for those payments as stock-based compensation.

In January 2017, the Company issued 327,500 Stock Appreciation Rights (“SARS”) to its employees. The SARS have an exercise price of $6.60 and will vest on the three year anniversary of the grant date. The Company will be recording a stock-based compensation charge of $770 from the date of the grant through 2020 for these SARS awards.

During the nine months ended September 30, 2017, the Company issued 243,000 shares of restricted stock and restricted stock units (collectively, “RSUs”) to its employees and directors. The RSUs have an aggregate grant date fair value of $1,966 and generally vest on the third anniversary of the date of grant. In addition, during the first quarter of 2017, the Company issued RSUs of which 930,600 awarded shares were outstanding as of September 30, 2017. However, the vesting of these awards is contingent upon the Company meeting a cumulative three year financial performance target and continued employment through the March 1, 2020 vesting date. These RSU awards do not yet have an established grant date fair value because the financial performance target is not yet established. Once the Company defines the financial performance target, and assuming the achievement of such performance targets is expected, the grant date is established and the Company will record the compensation expense over the vesting period. Additionally, the Company still has outstanding RSUs of 513,321 which are also based on a cumulative financial performance target and will vest on March 1, 2019.

New Accounting Pronouncements

In May 2017, the FASB issued Accounting Standards Update (“ASU”) 2017-09, Compensation - Stock Compensation: Scope of Modification Accounting, which provides guidance concerning which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in ASC 718.  This guidance is effective for annual and interim periods beginning after December 15, 2017, and early adoption is permitted. Amendments in this ASU will be applied prospectively to any award modified on or after the adoption date.  The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits, which requires the presentation of the service cost component of the net periodic pension and postretirement benefits costs in the same line item in the statement of operations as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of the net periodic pension and postretirement benefits costs are required to be presented as non-operating expenses in the statement of operations. This guidance is effective for annual periods beginning after December 15, 2017 and early adoption is permitted. The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other: Simplifying the Test for Goodwill Impairment, which eliminates step two from the two-step goodwill impairment test. Under the new guidance, an entity will perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value provided the loss recognized does not exceed the total amount of goodwill allocated to that reporting unit. This guidance is effective for annual or interim goodwill impairment tests performed in fiscal years beginning after December 15, 2019. The Company will early adopt this guidance for our impairment test performed during 2017, and does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows. This new guidance is intended to reduce diversity in practice regarding the classification of certain transactions in the statement of cash flows. This guidance is effective January 1, 2018 and requires a retrospective transition method. Early adoption is permitted. The Company currently classifies all cash outflows for contingent consideration as a financing activity. Upon adoption the Company is required to classify only the original estimated liability as a financing activity and any changes as an operating activity.

In February 2016, the FASB issued ASU 2016-02, which amends the ASC and creates Topic 842, Leases. Topic 842 will require lessees to recognize right-to-use assets and lease liabilities for those leases classified as operating leases under previous U.S. GAAP on the balance sheet. This guidance is effective for annual periods beginning after December 15, 2018 and early adoption is permitted. While not yet in a position to assess the full impact of the application of the new standard, the Company expects that the impact of recording the lease liabilities and the corresponding right-to-use assets will have a significant impact on its total assets and liabilities with a minimal impact on equity.

In January 2016, the FASB issued ASU 2016-01,Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Liabilities, which will require equity investments, except equity method investments, to be measured at fair value and any changes in fair value will be recognized in results of operations. This guidance is effective for annual and interim periods beginning after December 15, 2017 and early application is not permitted. Additionally, this guidance provides for the recognition of the cumulative effect of retrospective application of the new standard in the period of initial application. The Company does not expect the application of this guidance to have a significant impact on its consolidated financial position or results of operations.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which will replace all existing revenue guidance under U.S GAAP. The core principle of ASU 2014-09 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration expected to be received in exchange for those goods or services. On July 9, 2015, the FASB approved a one year deferral of the effective date of ASU 2014-09 to all annual and interim periods beginning after December 15, 2017. ASU 2014-09 provides for one of two methods of transition: (i) retrospective application to each prior period presented (Full Retrospective); or (ii) recognition of the cumulative effect of retrospective application of the new standard as of the beginning of the period of initial application (Modified Retrospective). The Company plans to apply ASU 2014-09 on the effective date of January 1, 2018, and intends to apply the Modified Retrospective method. Based on the Company’s assessment, the application of the new standard will result in a change in the timing of our revenue recognition within certain of the Company’s arrangements. Performance incentives are currently recognized in revenue when specific quantitative goals are achieved, or when the Company’s performance against qualitative goals is determined by the client. Under the new standard, the Company will be required to estimate the amount of the incentive that will be earned at the inception of the contract and recognize such incentive over the term of the contract. While performance incentives are not material to the Company’s revenue, this will result in an acceleration of revenue recognition for certain contract incentives compared to the current method. Further, based on the Company’s initial assessment, it is expected that an input measure such as cost to cost or labor hours would be an appropriate measure of progress in the majority of situations for which over time revenue recognition is applied.

Furthermore, in certain businesses, the Company records revenue as a principal and includes certain third-party-pass-through and out-of-pocket costs, which are billed to clients in connection with the services provided. In March 2016, the FASB issued further guidance on principal versus agent considerations; however, our initial assessments indicate that such change is not expected to have a material effect on the Company’s results of operations. The Company is continuing to evaluate the standard’s impact on the consolidated results of operations and financial condition, and the related disclosure requirements.

Goodwill and Intangible Assets, Intangible Assets, Indefinite-Lived, Policy [Policy Text Block]

Goodwill and Indefinite Lived Intangibles. In accordance with the FASB ASC Topic 350, Intangibles - Goodwill and Other, goodwill and indefinite lived intangible assets (trademarks) acquired as a result of a business combination, which are not subject to amortization, are tested for impairment annually as of October 1st of each year, or more frequently if indicators of potential impairment exist. For goodwill, impairment is assessed at the reporting unit level. For the nine months ended September 30, 2017 and the year ended December 31, 2016, goodwill was $839,361 and $844,759, respectively. For the three and nine months endedSeptember 30, 2017, there was a reduction in goodwill of $17,593 relating to the sale of certain subsidiaries, which was offset by $12,195 net foreign exchange translation adjustments. As a result of the these transactions, the Company performed interim goodwill testing on two reporting units and determined that there was no impairment charge in respect to the impacted reporting units. For the three and nine months endedSeptember 30, 2016, due to triggering events during the third quarter of 2016, the Company performed an interim goodwill impairment test and recognized goodwill impairment of $29,631. In addition, in the third quarter of 2016, the Company sold all of its ownership interests in Bryan Mills Iradesso Corporation (“Bryan Mills”) to the noncontrolling shareholders, resulting in a write off of goodwill of $764. See Note 4 for further information on the dispositions.

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Loss Per Common Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Schedule of Calculation of Numerator and Denominator in Earnings Per Share

The following table sets forth the computation of basic and diluted income (loss) per common share:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
	2017			2016			2017			2016
Numerator
Net income (loss) attributable to MDC Partners Inc.	$	18,493		$	(32,140	)	$	19,180		$	(54,937	)
Accretion on convertible preference shares	(1,948		)	—			(4,365		)	—
Net income allocated to convertible preference shares	(2,408		)	—			(1,782		)	—
Numerator for basic loss per common share - Net income (loss) attributable to MDC Partners Inc. common shareholders	14,137			(32,140		)	13,033			(54,937		)
Effect of dilutive securities:
Adjustment to net income allocated to convertible preference shares	13			—			9			—
Numerator for diluted income (loss) per common share- Net income (loss) attributable to MDC Partners Inc. common shareholders	$	14,150		$	(32,140	)	$	13,042		$	(54,937	)
Denominator
Denominator for basic income (loss) per common share - weighted average common shares	57,566,707			52,244,819			53,915,536			50,861,890
Effect of dilutive securities:
Impact of stock options and non-vested stock under employee stock incentive plans	376,373			—			312,672			—
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions	57,943,080			52,244,819			54,228,208			50,861,890
Basic income (loss) per common share	$	0.25		$	(0.62	)	$	0.24		$	(1.08	)
Diluted income (loss) per common share	$	0.24		$	(0.62	)	$	0.24		$	(1.08	)

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Accruals and Other Liabilities (Tables)

9 Months Ended

Sep. 30, 2017

Accrued and Other Liabilities [Abstract]

Accrued and Other Liabilities Disclosure

At September 30, 2017 and December 31, 2016, accruals and other liabilities included accrued media of $169,460 and $201,872, respectively; and included amounts due to noncontrolling interest holders for their share of profits, which will be distributed within the next twelve months of $5,802 and $4,154, respectively.

Changes in amounts due to noncontrolling interest holders included in accrued and other liabilities for the year ended December 31, 2016 and nine months ended September 30, 2017 were as follows:

	Noncontrolling Interests
Balance, December 31, 2015	$	5,473
Income attributable to noncontrolling interests	5,218
Distributions made	(7,772		)
Other (1)	1,235
Balance, December 31, 2016	$	4,154
Income attributable to noncontrolling interests	6,588
Distributions made	(5,272		)
Other (1)	332
Balance, September 30, 2017	$	5,802

(1) Other consists primarily of business acquisitions, sale of a business, step-up transactions, and cumulative translation adjustments.

At September 30, 2017 and December 31, 2016, accounts payable included $47,430 and $80,193 of outstanding checks, respectively.

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Other Income (Tables)

9 Months Ended

Sep. 30, 2017

Other Income and Expenses [Abstract]

Schedule of Other Nonoperating Income, by Component [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Other income (expense)	$	(7	)	$	26		$	271		$	(220	)
Loss on sale of business (1)	(1,424		)	(800		)	(1,424		)	(800		)
Gain on sale of investments (2)	168			682			168			682
Foreign currency transaction gain (loss)	9,912			(5,916		)	18,797			9,868
	$	8,649		$	(6,008	)	$	17,812		$	9,530

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Significant Accounting Policies (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) Clients	Sep. 30, 2016 USD ($) Clients	Sep. 30, 2017 USD ($) Clients	Sep. 30, 2016 USD ($) Clients	Dec. 31, 2016 USD ($) Clients
Significant Accounting Policies [Line Items]
Clients exceeding consolidated accounts receivable percentage | Clients	0		0		0
Consolidated Accounts Receivable Percentage	10.00%		10.00%		10.00%
Clients exceeding consolidated largest client revenue | Clients	0	0	0	0
Consolidated Largest Client Revenue	10.00%	10.00%	10.00%
Option to purchase noncontrolling interest impairment charge	$ 0	$ 0	$ 0	$ 0
Beginning Balance			60,180,000
Redemptions	(337,000)	$ (520,000)	(9,650,000)
Granted			2,315,000	22,498,000
Ending Balance	60,092,000		60,092,000		$ 60,180,000
Redeemable Noncontrolling Interest [Member]
Significant Accounting Policies [Line Items]
Beginning Balance			60,180,000	$ 69,471,000	69,471,000
Redemptions			(816,000)		(1,708,000)
Granted			0		2,274,000
Changes in redemption value			299,000		(9,604,000)
Currency Translation Adjustments			429,000		(253,000)
Ending Balance	$ 60,092,000		$ 60,092,000		$ 60,180,000

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Significant Accounting Policies (Details Textual)							3 Months Ended			9 Months Ended		12 Months Ended
	May 01, 2024	Apr. 01, 2017	May 03, 2016	Mar. 23, 2016	Oct. 23, 2014 USD ($)	Mar. 28, 2012	Sep. 30, 2017 USD ($) Clients shares	Mar. 31, 2017 shares	Sep. 30, 2016 USD ($) Clients	Sep. 30, 2017 USD ($) Clients shares	Sep. 30, 2016 USD ($) Clients	Dec. 31, 2016 USD ($) Clients shares	Jan. 31, 2017 $ / shares shares	Dec. 31, 2015 USD ($)	Mar. 20, 2013
Significant Accounting Policies [Line Items]
Deferred Tax Liability, Prior Period Correction												$ 6,916
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability									$ 1,390		$ 713
Increase (Decrease) in Book Overdrafts										$ 17,532,000
Stock Issued During Period, Shares, Convertible Preferred Shares | shares										90,220,000
Redeemable noncontrolling interests							$ 60,092,000			$ 60,092,000		60,180,000
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests							337,000		520,000	9,650,000
Noncontrolling Interest, Increase from Business Combination										2,315,000	22,498,000
Debt Issuance Costs, Net							$ (18,161,000)			$ (18,161,000)		$ (18,420,000)
Clients exceeding consolidated accounts receivable percentage | Clients							0			0		0
Interest Rate Percentage On Senior Notes							6.75%			6.75%
Put option noncontrolling interest impairment charge							$ 0		$ 0	$ 0	$ 0
Cost Method Investments							$ 10,350,000			$ 10,350,000		$ 10,132,000
Consolidated Accounts Receivable Percentage							10.00%			10.00%		10.00%
Clients exceeding consolidated largest client revenue | Clients							0		0	0	0
Consolidated Largest Client Revenue							10.00%		10.00%	10.00%
Business Combination, Acquisition Related Costs							$ 216,000		$ 806,000	$ 693,000	$ 2,266,000
Assets							1,617,831,000			1,617,831,000		$ 1,577,378,000
Liabilities							1,946,673,000			1,946,673,000		2,026,674,000
Restricted stock grant date fair value										27,852,000
Adjustment to deferred acquisition consideration included in interest expense							24,000		30,000	77,000	181,000
Goodwill							839,361,000			839,361,000		844,759,000
Goodwill, Impairment Loss							0		29,631,000	0	29,631,000
Goodwill, Written off Related to Sale of Business Unit										17,593,000	764,000
Doner [Member]
Significant Accounting Policies [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage		45.00%				30.00%
Assets							100,229,000			100,229,000		102,456,000
Liabilities							$ 53,508,000			53,508,000		57,622,000
Doner [Member]
Significant Accounting Policies [Line Items]
Ownership Interest Percentage Increase On Exercise Of Option		15.00%
Aggregate 2012 Acquisitions [Member] | Doner [Member]
Significant Accounting Policies [Line Items]
Ownership Interest Percentage Increase On Exercise Of Option						70.00%
Aggregate 2017 Step Up Transactions [Domain]
Significant Accounting Policies [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests										11,965
Noncontrolling Interest, Increase from Business Combination										$ 2,316
Aggregate 2017 Step Up Transactions [Domain] | Doner [Member]
Significant Accounting Policies [Line Items]
Ownership Interest Percentage Increase On Exercise Of Option		85.00%
Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life										3 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life										7 years
Equity Method Investment, Ownership Percentage							50.00%			50.00%
Real Estate Joint Venture [Member]
Significant Accounting Policies [Line Items]
Equity Method Investment, Ownership Percentage							30.00%			30.00%
Wells Fargo Capital Finance, LLC
Significant Accounting Policies [Line Items]
Debt Instrument, Maturity Date			May 03, 2021		Sep. 30, 2019
Line of Credit Facility, Maximum Borrowing Capacity					$ 325,000,000
Contingent payment [Domain]
Significant Accounting Policies [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability							$ (2,462,000)		$ 11,152,000	$ 12,152,000	$ 17,180,000
Notes due 2020 [Member]
Significant Accounting Policies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							6.75%			6.75%
Six Point Seven Five Percentage Notes [Member]
Significant Accounting Policies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage															6.75%
Six Point Seven Five Percentage Notes [Member] | Wells Fargo Capital Finance, LLC
Significant Accounting Policies [Line Items]
Debt Instrument, Maturity Date				Apr. 01, 2020
Notes due 2024 [Domain]
Significant Accounting Policies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							6.50%			6.50%
Six Point Five Zero Percentage Notes [Domain]
Significant Accounting Policies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				6.50%			6.50%			6.50%
Restricted Stock Units (RSUs) [Member] | Common Class A
Significant Accounting Policies [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares										243,000
Restricted stock grant date fair value										$ 1,966,000
Scenario, Forecast [Member] | Six Point Five Zero Percentage Notes [Domain]
Significant Accounting Policies [Line Items]
Debt Instrument, Maturity Date	May 01, 2024
Scenario, Forecast [Member] | Six Point Five Zero Percentage Notes [Domain] | Wells Fargo Capital Finance, LLC
Significant Accounting Policies [Line Items]
Debt Instrument, Maturity Date	May 01, 2024
Noncontrolling Interest Equity [Domain] | Aggregate 2016 Step Up Transactions [Member]
Significant Accounting Policies [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests												19,354
Redeemable Noncontrolling Interest [Member]
Significant Accounting Policies [Line Items]
Redeemable noncontrolling interests							$ 60,092,000			60,092,000		60,180,000		$ 69,471,000
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests										816,000		1,708,000
Noncontrolling Interest, Increase from Business Combination										0		2,274,000
Changes in redemption value										299,000		(9,604,000)
Redeemable Noncontrolling Interest Currency Adjustments										429,000		$ (253,000)
Stock Incentive Plan 2011 [Member] | Stock Appreciation Rights (SARs) [Member]
Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares													327,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares													$ 6.60
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options							$ 770,000			$ 770,000
Stock Incentive Plan 2011 [Member] | Contingent Restricted Stock Units (RSUs) [Member]
Significant Accounting Policies [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares										930,600
Stock Incentive Plan 2016 [Member] | Contingent Restricted Stock Units (RSUs) [Member]
Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | shares							513,321			513,321
Preferred Stock [Member] | Series 4 Convertible Preferred Stock [Domain]
Significant Accounting Policies [Line Items]
Stock Issued During Period, Shares, Convertible Preferred Shares | shares								95,000		95,000		0

XML

Loss Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2017

Sep. 30, 2016

Sep. 30, 2017

Sep. 30, 2016

Class of Stock [Line Items]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table sets forth the computation of basic and diluted income (loss) per common share:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
	2017			2016			2017			2016
Numerator
Net income (loss) attributable to MDC Partners Inc.	$	18,493		$	(32,140	)	$	19,180		$	(54,937	)
Accretion on convertible preference shares	(1,948		)	—			(4,365		)	—
Net income allocated to convertible preference shares	(2,408		)	—			(1,782		)	—
Numerator for basic loss per common share - Net income (loss) attributable to MDC Partners Inc. common shareholders	14,137			(32,140		)	13,033			(54,937		)
Effect of dilutive securities:
Adjustment to net income allocated to convertible preference shares	13			—			9			—
Numerator for diluted income (loss) per common share- Net income (loss) attributable to MDC Partners Inc. common shareholders	$	14,150		$	(32,140	)	$	13,042		$	(54,937	)
Denominator
Denominator for basic income (loss) per common share - weighted average common shares	57,566,707			52,244,819			53,915,536			50,861,890
Effect of dilutive securities:
Impact of stock options and non-vested stock under employee stock incentive plans	376,373			—			312,672			—
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions	57,943,080			52,244,819			54,228,208			50,861,890
Basic income (loss) per common share	$	0.25		$	(0.62	)	$	0.24		$	(1.08	)
Diluted income (loss) per common share	$	0.24		$	(0.62	)	$	0.24		$	(1.08	)

Net loss attributable to MDC Partners Inc.

$ 18,493

$ (32,140)

$ 19,180

$ (54,937)

Numerator

Income (Loss) from Continuing Operations Attributable to Parent

14,137

(32,140)

13,033

(54,937)

Adjustment to Net Income, Allocated to Convertible Shares

13

0

9

0

Income (Loss) from Continuing Operations Attributable to Parent, Diluted

$ 14,150

$ (32,140)

$ 13,042

$ (54,937)

Denominator

Denominator for basic income (loss) per common share - weighted average common shares

57,566,707

52,244,819

53,915,536

50,861,890

Effect of dilutive securities:

376,373

0

312,672

0

Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions

57,943,080

52,244,819

54,228,208

50,861,890

Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share)

$ 245.58

$ (615.18)

$ 241.73

$ (1,080.12)

Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share)

$ 244.21

$ (615.18)

$ 240.50

$ (1,080.12)

Series 4 Convertible Preferred Stock [Domain] | Convertible Preferred Stock [Member]

Numerator

Accretion on convertible preferred shares

$ (1,948)

$ 0

$ (4,365)

$ 0

Net Income Allocated to Convertible Shares

$ (2,408)

$ 0

$ (1,782)

$ 0

XML

Loss Per Common Share (Details Textual) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Oct. 27, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment to Net Income, Allocated to Convertible Shares	$ 13		$ 0	$ 9	$ 0
Weighted Average Number Diluted Shares Outstanding Adjustment	376,373		0	312,672	0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				1,118,085	523,321
Stock Issued During Period, Shares, Convertible Preferred Shares				90,220,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements					918,260
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	741,712			805,413
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements					880,760
Contingent Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				1,443,921
Series 4 Convertible Preferred Stock [Domain] | Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Accretion on convertible preferred shares	$ (1,948)		$ 0	$ (4,365)	$ 0
Stock Issued During Period, Shares, Convertible Preferred Shares		95,000		95,000		0
Shares, Outstanding	95,000			95,000		0	95,000
Convertible Preferred Stock, Shares Issued upon Conversion	9,936,514			9,936,514
Net Income Allocated to Convertible Shares	$ (2,408)		$ 0	$ (1,782)	$ 0

XML

Acquisitions (Details) - USD ($)

3 Months Ended

9 Months Ended

Sep. 30, 2017

Sep. 30, 2016

Sep. 30, 2017

Sep. 30, 2016

Gain (Loss) on Disposition of Business

$ (1,424,000)

$ (800,000)

$ (1,424,000)

$ (800,000)

Business Combination Disclosure [Text Block]

Valuations of acquired companies are based on a number of factors, including specialized know-how, reputation, competitive position and service offerings. The Company’s acquisition strategy has been focused on acquiring the expertise of an assembled workforce in order to continue to build upon the core capabilities of its various strategic business platforms to better serve the Company’s clients. The Company’s strategy includes acquiring ownership stakes in well-managed businesses with strong reputations in the industry. The Company’s model of “Perpetual Partnership” often involves acquiring a majority interest rather than a 100% interest and leaving management owners with a significant financial interest in the performance of the acquired entity for a minimum period of time, typically not less than five years. The Company’s acquisition model in this scenario typically provides for (i) an initial payment at the time of closing, (ii) additional contingent purchase price obligations based on the future performance of the acquired entity, and (iii) an option by the Company to purchase (and in some instances a requirement to so purchase) the remaining interest of the acquired entity under a predetermined formula.

Contingent purchase price obligations. The Company’s contingent purchase price obligations are generally payable within a five year period following the acquisition date, and are based on (i) the achievement of specific thresholds of future earnings, and (ii) in certain cases, the growth rate of those earnings. Contingent purchase price obligations are recorded as deferred acquisition consideration on the balance sheet at the acquisition date fair value and adjusted at each reporting period through operating income or net interest expense, depending on the nature of the arrangement. On occasion, the Company may initiate a renegotiation of previously acquired ownership interests and any resulting change in the estimated amount of consideration to be paid is adjusted in the reporting period through operating income or net interest expense, depending on the nature of the arrangement. See Notes 2, 9, and 12 for additional information on the deferred acquisition consideration.

Options to purchase. When acquiring less than 100% ownership, the Company may enter into agreements that give the Company an option to purchase, or require the Company to purchase, the incremental ownership interests under certain circumstances. Where the option to purchase the incremental ownership is within the Company’s control, the amounts are recorded as noncontrolling interests in the equity section of the Company’s balance sheet. Where the incremental purchase may be required of the Company, the amounts are recorded as redeemable noncontrolling interests in mezzanine equity at their estimated acquisition date redemption value and adjusted at each reporting period for changes to their estimated redemption value through additional paid-in capital (but not less than their initial redemption value), except for foreign currency translation adjustments. On occasion, the Company may initiate a renegotiation to acquire an incremental ownership interest and the amount of consideration paid may differ materially from the balance sheet amounts. See Note 12 for additional information on redeemable noncontrolling interests.

Employment conditions. From time to time, specifically when the projected success of an acquisition is deemed to be dependent on retention of specific personnel, such acquisition may include deferred payments that are contingent upon employment terms as well as financial performance. The Company accounts for those payments through operating income as stock-based compensation over the required retention period. For the three and nine months ended September 30, 2017 and 2016, stock-based compensation included $4,064 and $9,792, respectively, and $2,259 and $7,184, respectively, of expense relating to those payments.

Distributions to noncontrolling shareholders. If noncontrolling shareholders have the right to receive distributions based on the profitability of an acquired entity, the amount is recorded as income attributable to noncontrolling interests.  However, there are circumstances when the Company acquires a majority interest and the selling shareholders waive their right to receive distributions with respect to their retained interest for a period of time, typically not less than five years.  Under this model, the right to receive such distributions typically begins concurrently with the purchase option period and, therefore, if such option is exercised at the first available date, the Company may not record any noncontrolling interest over the entire period from the initial acquisition date through the acquisition date of the remaining interests.

2017 Acquisitions

In 2017, the Company entered into various non-material transactions in connection with certain of its majority-owned entities. As a result of the foregoing, the Company made total cash closing payments of $3,858, increased fixed deferred consideration liability by $7,208, reduced redeemable noncontrolling interests by $816, reduced noncontrolling interests equity by $11,965, reduced noncontrolling interest payable by $397, and increased additional paid-in capital by $2,316. In addition, a stock-based compensation charge of $996 has been recognized representing the consideration paid in excess of the fair value of the interest acquired.

2017 Dispositions

During the three months ended September 30, 2017, the Company sold all of its ownership interests in three subsidiaries resulting in recognition of a net loss on sale of business of $1,424. The net assets reflected in the calculation of the net loss on sale was inclusive of goodwill of $17,593. Goodwill was allocated to the subsidiaries based on the relative fair value of the sold subsidiaries compared to the fair value of the respective reporting units. See Note 1 for details. Additionally, the Company recorded a reduction in noncontrolling interests of $10,657.

2016 Acquisitions

Effective July 1, 2016, the Company acquired 100% of the equity interests of Forsman & Bodenfors AB (“F&B”), an advertising agency based in Sweden, for an estimated aggregate purchase price at acquisition date of $49,837, consisting of a closing payment of 1,900,000 MDC Class A subordinate voting shares with an acquisition date fair value of $34,219, plus additional deferred acquisition payments with an estimated present value at acquisition date of $15,618. The amount of additional payments are based on the financial results of the acquired business for 2015 and 2016 as well as for the value of the Company’s shares from July 1, 2016 up to and including the close of business on November 2, 2016. During the three months ended June 30, 2017, the Company paid cash of $3,055 and issued an additional 2,450,000 MDC Class A subordinate voting shares with a fair value of $20,800 as a settlement of deferred acquisition consideration.

An allocation of excess purchase price consideration of this acquisition to the fair value of the net assets acquired resulted in identifiable intangibles of $36,698, consisting primarily of customer lists, trade names and covenants not to compete, and goodwill of $24,778, including the value of the assembled workforce. The identified assets have a weighted average useful life of approximately 10.8 years and will be amortized in a manner represented by the pattern in which the economic benefits of such assets are expected to be realized. In addition, the Company has recorded $2,275 as the present value of redeemable noncontrolling interests and $5,514 as the present value of noncontrolling interests both relating to the noncontrolling interest of F&B’s subsidiaries. None of the intangibles and goodwill are tax deductible and the Company recorded a deferred tax liability of $8,074 related to the intangibles. F&B’s results are included in the Global Integrated Agencies segment.

During the six months ended June 30, 2017, F&B earned revenue of $43,535 and incurred a net loss of $4,460, which is included in our consolidated results for the nine months ended September 30, 2017. The net loss was attributable to an increase in the deferred acquisition payment liability related to such acquisition, driven by the decrease in t    he future market performance of the Company’s stock price and the amortization of the intangibles identified in the allocation of the purchase price consideration.

Effective April 1, 2016, the Company acquired the remaining 40% ownership interests of Luntz Global Partners LLC. In 2016, the Company also entered into various non-material transactions in connection with other majority-owned entities. As a result of the foregoing, the Company made total cash closing payments of $1,581, eliminated the contingent deferred acquisition payments of $4,052 and fixed deferred acquisition payments of $467 related to certain initial acquisition of the equity interests, reduced other assets by $428, reduced redeemable noncontrolling interests by $1,005, reduced noncontrolling interests by $19,354, increased accruals and other liabilities by $94, and increased additional paid-in capital by $22,775. Additional deferred payments with an estimated present value at acquisition date of $2,393 that are contingent upon service conditions have been excluded from deferred acquisition consideration and will be expensed as stock-based compensation over the required service period.

2016 Dispositions

Effective September 30, 2016, the Company sold all of its ownership interests in Bryan Mills to the noncontrolling shareholders and recognized a loss of $800. The net assets reflected in the calculation of the loss on sale was inclusive of goodwill of $764.

Noncontrolling Interests

Changes in the Company’s ownership interests in its less than 100% owned subsidiaries during the three and nine months ended September 30, 2017 and 2016 were as follows:

Net Income (Loss) Attributable to MDC Partners Inc. and

Transfers (to) from the Noncontrolling Interests

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017		2016
Net income (loss) attributable to MDC Partners Inc.	$	18,493		$	(32,140	)	$	19,180	$	(54,937	)
Transfers from the noncontrolling interest:
(Decrease) increase in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of Redeemable Noncontrolling Interests and Noncontrolling Interests	(337		)	(520		)	2,315		22,498
Net transfers from noncontrolling interests	$	(337	)	$	(520	)	$	2,315	$	22,498
Change from net income (loss) attributable to MDC Partners Inc. and transfers to noncontrolling interests	$	18,156		$	(32,660	)	$	21,495	$	(32,439	)

Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests

(337,000)

(520,000)

$ (9,650,000)

Noncontrolling Interest, Increase from Business Combination

2,315,000

22,498,000

Net Income Loss Including Transfer from Non Controlling Interests

18,156,000

(32,660,000)

21,495,000

(32,439,000)

Noncontrolling Interest, Decrease from Deconsolidation

(10,657,000)

Net loss attributable to MDC Partners Inc.

18,493,000

(32,140,000)

19,180,000

(54,937,000)

Additional Paid-in Capital [Member]

Noncontrolling Interest, Increase from Business Combination

2,315,000

Parent [Member]

Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests

$ (337,000)

$ (520,000)

2,315,000

$ 22,498,000

Noncontrolling Interest, Increase from Business Combination

2,315,000

Net loss attributable to MDC Partners Inc.

$ 19,180,000

XML

Acquisitions (Details Textual) - USD ($)			3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Apr. 05, 2017	Jul. 01, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Apr. 01, 2016
Business Acquisition [Line Items]
Adjustments to deferred acquisition consideration included in share-based compensation			$ 4,064	$ 2,259		$ 9,792	$ 7,184
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			(337,000)	(520,000)		(9,650,000)
Noncontrolling Interest, Increase from Business Combination						2,315,000	22,498,000
Stock-based compensation			6,380,000	5,228,000		16,870,000	15,443,000
Goodwill, Written off Related to Sale of Business Unit						17,593,000	764,000
Business Acquisition, Pro Forma Net Income (Loss)			18,493,000	(32,140,000)		19,180,000	(54,937,000)
Redeemable noncontrolling interests			$ 60,092,000			$ 60,092,000		$ 60,180,000
Noncontrolling Interest, Ownership Percentage by Parent			100.00%			100.00%
Net Income Loss Including Transfer from Non Controlling Interests			$ 18,156,000	(32,660,000)		$ 21,495,000	(32,439,000)
Forsman & Bodenfors AB [Domain]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue					$ 43,535
Business Acquisition, Pro Forma Net Income (Loss)					4,460
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 36,698
Goodwill, Acquired During Period		$ 24,778
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years 9 months
Business Combination, Acquisition of Less than 100 Percent, Redeemable Noncontrolling Interest, Fair Value		$ 2,275
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value		5,514
Business Acquisition, Goodwill, Expected Tax Deductible Amount		0
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Intangible Assets		$ 8,074
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Consideration Transferred		$ 49,837
Business Combination, Contingent Consideration, Liability		$ 15,618			$ 3,055
Luntz Global Partners L L C
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired									40.00%
Aggregate 2017 Step Up Transactions [Domain]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid						3,858
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests						(11,965)
Noncontrolling Interest, Period Increase (Decrease)						397
Noncontrolling Interest, Increase from Business Combination						2,316
Stock-based compensation						996
Business Combination, Acquisition of Less than 100 Percent, Redeemable Noncontrolling Interest, Fair Value						816
Business Combination, Contingent Consideration, Liability			7,208			7,208
Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid								1,581
Business Combination, Acquisition of Less than 100 Percent, Redeemable Noncontrolling Interest, Fair Value								1,005
Business Combinations, Assets Relinquished by Acquirer								428
Business Combinations, Liabilities Relinquished Previously due to Acquiree								94
Noncontrolling Interest [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests						(11,965,000)
Business Acquisition, Pro Forma Net Income (Loss)						0
Additional Paid-in Capital [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Increase from Business Combination						2,315,000
Additional Paid-in Capital [Member] | Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests								(22,775)
Contingent payment [Domain]
Business Acquisition [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			$ (2,462,000)	$ 11,152,000		$ 12,152,000	$ 17,180,000
Contingent payment [Domain] | Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Deferred Stock-based Compensation, Discounted								2,393
Business Combination, Consideration Transferred								4,052,000
Fixed payments [Member] | Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred								467
Noncontrolling Interest Equity [Domain] | Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests								$ (19,354)
Common Class A [Member] | Common Stock [Member] | Forsman & Bodenfors AB [Domain]
Business Acquisition [Line Items]
Stock Issued During Period, Shares, Acquisitions	2,450,000	1,900,000
Stock Issued During Period, Value, Acquisitions	$ 20,800	$ 34,219,000

XML

Accruals and Other Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Accrued and Other Liabilities [Abstract]
Net Income (Loss) Attributable to Noncontrolling Interest	$ 3,491	$ 1,059	$ 6,588	$ 3,172	$ 5,218
Payments to Noncontrolling Interests			(5,272)	(6,549)	(7,772)
Beginning balance			4,154	$ 5,473	5,473
Other			332		1,235
Ending balance	$ 5,802		$ 5,802		$ 4,154

XML

Accruals and Other Liabilities (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Accrued and Other Liabilities [Abstract]
Accrued Media Cost, Current	$ 169,460	$ 201,872
Accrued and Other Liabilities Attributable To Noncontrolling Interest	5,802	4,154	$ 5,473
Outstanding Checks	$ 47,430	$ 80,193

XML

Debt (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Debt [Line Items]
Debt Issuance Costs, Net	$ (18,161,000)	$ (18,420,000)
Revolving credit agreement	48,607,000	54,425,000
Debt, Long-term and Short-term, Combined Amount, Total	930,446,000	936,005,000
Obligations under capital leases	743,000	431,000
Debt and Capital Lease Obligations	931,189,000	936,436,000
Less current portion:	300,000	228,000
Long-term Debt, Excluding Current Maturities, Total	930,889,000	936,208,000
Notes due 2024 [Domain]
Debt [Line Items]
Senior Notes	$ 900,000,000	$ 900,000,000

XML

Debt (Details Textual) - USD ($)						3 Months Ended		9 Months Ended		12 Months Ended	37 Months Ended
	May 01, 2024	May 03, 2016	Mar. 23, 2016	Oct. 23, 2014	Mar. 20, 2013	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	May 01, 2019
Debt [Line Items]
Debt Issuance Costs, Net						$ 18,161,000		$ 18,161,000		$ 18,420,000
Long-term Line of Credit, Noncurrent						48,607,000		48,607,000		54,425,000
Loss on redemption of notes						0	$ 0	0	$ (33,298,000)
Interest Paid								32,324,000	$ 27,979,000
Letters of Credit Outstanding, Amount						5,009,000		5,009,000
Outstanding Checks						$ 47,430,000		$ 47,430,000		80,193,000
Six Point Five Zero Percentage Notes [Domain]
Debt [Line Items]
Debt Instrument, Face Amount			$ 900,000
Debt Instrument, Interest Rate, Stated Percentage			6.50%			6.50%		6.50%
Proceeds from Offering			$ 880,000
Debt Instrument, Redemption Date, One								May 01, 2019
Debt Instrument, Redemption Date, Two								May 01, 2020
Debt Instrument, Percentage Of Redemption Price, Redemption Date Three								101.625%
Debt Instrument, Redemption Date, Three								May 01, 2021
Debt Instrument, Redemption Date, Latest For Redemption At Face Amount								May 01, 2022
Debt Instrument, Percentage Of Redemption Price, Redemption Date One								104.875%
Debt Instrument, Percentage Of Redemption Price, Redemption Date Two								103.25%
Debt Instrument, Percentage Of Redemption Price, Redemption Date, Latest For Redemption At Face Amount								100.00%
Debt Instrument, Percentage Redeemable Redemption Date, Additional								106.50%
Debt Instrument, Percentage Of Redemption Price, Change In Ownership Control								101.00%
Notes due 2024 [Domain]
Debt [Line Items]
Senior Notes						$ 900,000,000		$ 900,000,000		900,000,000
Debt Instrument, Interest Rate, Stated Percentage						6.50%		6.50%
Notes due 2020 [Member]
Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						6.75%		6.75%
6.75% Notes
Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					6.75%
Loss on redemption of notes										$ 33,298
Debt Instrument, Percentage Of Redemption Price, Redemption Date One			103.375%
Wells Fargo Capital Finance, LLC
Debt [Line Items]
Line of Credit Facility, Increase (Decrease), Net				$ 100,000,000
Long-term Line of Credit					$ 225,000,000
Debt Instrument, Maturity Date		May 03, 2021		Sep. 30, 2019
Debt Instrument, Face Amount				$ 325,000,000
Line of Credit Facility, Description					Dec. 31, 2018
Wells Fargo Capital Finance, LLC | Base Rate
Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.75%		1.00%
Wells Fargo Capital Finance, LLC | London Interbank Offered Rate (LIBOR)
Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				1.75%
Wells Fargo Capital Finance, LLC | Non-Prime Rate and Prime Rate on European Advances [Member]
Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.50%
Wells Fargo Capital Finance, LLC | 6.75% Notes
Debt [Line Items]
Debt Instrument, Maturity Date			Apr. 01, 2020
Scenario, Forecast [Member] | Six Point Five Zero Percentage Notes [Domain]
Debt [Line Items]
Debt Instrument, Maturity Date	May 01, 2024
Scenario, Forecast [Member] | Wells Fargo Capital Finance, LLC | Six Point Five Zero Percentage Notes [Domain]
Debt [Line Items]
Debt Instrument, Maturity Date	May 01, 2024
Scenario, Forecast [Member] | Optional redemption [Domain] | Six Point Five Zero Percentage Notes [Domain]
Debt [Line Items]
Debt Instrument, Percentage Of Redemption Price Redemption Date, Additional											35.00%

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Share Capital (Details Textual)	Oct. 27, 2017 shares	Sep. 30, 2017 vote shares	Dec. 31, 2016 shares
Preferred Stock [Member] | Series 4 Convertible Preferred Stock [Domain]
Share Capital [Line Items]
Shares, Outstanding	95,000	95,000	0
Common Stock [Member]
Share Capital [Line Items]
Shares, Outstanding		56,314,344	52,802,058
Common Stock [Member] | Common Class A [Member]
Share Capital [Line Items]
Common Stock, Voting Rights, Number of Votes per Share | vote		1
Shares, Outstanding		56,310,589	52,798,303
Common Stock [Member] | Common Class B
Share Capital [Line Items]
Common Stock, Voting Rights, Number of Votes per Share | vote		20
Shares, Outstanding		3,755

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Convertible Preference Shares (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Preferred Units [Line Items]
Stock Issued During Period, Shares, Convertible Preferred Shares				90,220,000
Series 4 Convertible Preferred Stock [Domain]
Preferred Units [Line Items]
Proceeds from issuance of convertible preference shares				$ 95,000	$ 0
Convertible Preferred Stock [Member] | Series 4 Convertible Preferred Stock [Domain]
Preferred Units [Line Items]
Stock Issued During Period, Shares, Convertible Preferred Shares		95,000		95,000		0
Preferred Stock, Value, Issued				$ 90,220
Accretion on convertible preferred shares	$ 1,948		$ 0	4,365	$ 0
Preferred Stock, Liquidation Preference, Value	$ 99,365			$ 99,365		$ 0
Preferred Stock, Conversion Basis, Common Stock Class A Closing Trade Price		125.00%

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Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	$ 144,847
Fair Value, Inputs, Level 3 [Member]
Liabilities:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	73,358
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	19,233
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Other Adjustments	(27,118)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Foreign Currency Translation Adjustment	1,336
Fair Value, Inputs, Level 1 | Six Point Five Zero Percentage Notes [Domain]
Liabilities:
Long term debt, Carrying Amount	900,000	$ 900,000
Long term debt, Fair Value	$ 909,000	$ 812,250

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Fair Value Measurements (Details 1) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Ending balance of contingent payments	$ 144,847
Fair Value, Inputs, Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Payments	73,358
Additions	0
Redemption value adjustments	19,233
Other	(27,118)
Foreign translation adjustment	$ 1,336

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Fair Value Measurements (Details Textual) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred acquisition consideration settled through issuance of shares	$ 27,852,000
Common Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred acquisition consideration settled through issuance of shares	$ 28,727,000
Stock Issued During Period, Shares, New Issues	3,353,939
Common Stock [Member] | Common Class A [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred acquisition consideration settled through issuance of shares		$ 10,458,000
Share Capital To Be Issued [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stock Authorized During Period, Value, To be Issued	$ (2,360,000)
Stock Authorized During Period, Shares, To be Issued	100,000
Aggregate 2016 Step Up Transactions [Member] | Contingent payment [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Combination, Consideration Transferred			$ 4,052,000
Aggregate 2016 Step Up Transactions [Member] | Fixed payments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Combination, Consideration Transferred			$ 467

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Other Income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Noncontrolling Interest, Decrease from Deconsolidation			$ 10,657,000
Realized gain (loss) from disposal of cost and equity method investments		$ 682,000		$ 682,000
Other income (expense)	$ (7,000)	26,000	271,000	(220,000)
Gain (Loss) on Disposition of Business	1,424,000	800,000	1,424,000	800,000
Cost-method Investments, Realized Gains	168,000		168,000
Foreign currency transaction gain	9,912,000	(5,916,000)	18,797,000	9,868,000
Other, net	$ 8,649,000	$ (6,008,000)	$ 17,812,000	$ 9,530,000

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Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) reportable_segment	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | reportable_segment			4
Revenue	$ 375,800	$ 349,254	$ 1,111,032	$ 995,343
Cost of services sold	249,418	235,659	754,803	675,940
Office and general expenses	77,910	83,303	251,313	233,840
Depreciation, Depletion, Amortization and Impairment, Nonproduction	11,252	41,043	32,916	63,699
Operating profit	37,220	(10,751)	72,000	21,864
Other Income (Expense):
Other income, net	8,649	(6,008)	17,812	9,530
Interest and Debt Expense, net	16,258	16,322	48,309	48,690
Gain (Loss) on Repurchase of Debt Instrument	0	0	0	(33,298)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	29,611	(33,081)	41,503	(50,594)
Income Tax Expense (Benefit)	9,049	(1,930)	17,659	1,180
Income Loss From Continuing Operations Before Equity In Earnings Of Non-consolidated Affiliates	20,562	(31,151)	23,844	(51,774)
Income (Loss) from Equity Method Investments	1,422	70	1,924	9
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	21,984	(31,081)	25,768	(51,765)
Net Income (Loss) Attributable to Noncontrolling Interest	(3,491)	(1,059)	(6,588)	(3,172)	$ (5,218)
Net Income (Loss) Attributable to Parent	18,493	(32,140)	19,180	(54,937)
Stock-based compensation	6,380	5,228	16,870	15,443
Supplemental Segment Information:
Capital expenditures	7,149	6,274	28,305	19,723
Total Assets	1,617,831		1,617,831		$ 1,577,378
Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion, Amortization and Impairment, Nonproduction	255	359	864	1,266
Operating profit	(10,724)	(7,051)	(28,982)	(32,982)
Other Income (Expense):
Stock-based compensation	477	605	1,599	2,059
Supplemental Segment Information:
Capital expenditures	1	0	4	32
Global Integrated Agencies [Member]
Segment Reporting Information [Line Items]
Revenue	193,979	177,262	576,935	489,880
Depreciation, Depletion, Amortization and Impairment, Nonproduction	6,359	6,111	17,889	14,986
Operating profit	19,819	2,873	33,765	24,316
Other Income (Expense):
Net Income (Loss) Attributable to Parent	18,493	(32,140)	19,180	(54,937)
Stock-based compensation	3,840	2,890	9,892	9,030
Supplemental Segment Information:
Capital expenditures	1,950	3,003	17,639	10,703
Domestic Creative Agencies [Member]
Segment Reporting Information [Line Items]
Revenue	24,173	22,181	67,473	66,274
Depreciation, Depletion, Amortization and Impairment, Nonproduction	336	353	1,062	1,263
Operating profit	5,716	4,688	13,563	14,779
Other Income (Expense):
Stock-based compensation	177	150	502	487
Supplemental Segment Information:
Capital expenditures	324	222	874	920
Specialized Communications [Member]
Segment Reporting Information [Line Items]
Revenue	40,670	40,309	125,470	123,006
Depreciation, Depletion, Amortization and Impairment, Nonproduction	1,220	189	3,657	5,123
Operating profit	4,775	11,101	13,410	17,860
Other Income (Expense):
Stock-based compensation	659	564	2,264	1,556
Supplemental Segment Information:
Capital expenditures	206	56	673	2,183
Media Services [Member]
Segment Reporting Information [Line Items]
Revenue	33,027	34,481	103,966	96,681
Depreciation, Depletion, Amortization and Impairment, Nonproduction	917	2,338	2,933	4,437
Operating profit	2,421	466	8,618	3,510
Other Income (Expense):
Stock-based compensation	150	70	464	187
Supplemental Segment Information:
Capital expenditures	2,171	2,008	3,455	2,634
All Other [Member]
Segment Reporting Information [Line Items]
Revenue	83,951	75,021	237,188	219,502
Depreciation, Depletion, Amortization and Impairment, Nonproduction	2,165	31,693	6,511	36,624
Operating profit	15,213	(22,828)	31,626	(5,619)
Other Income (Expense):
Stock-based compensation	1,077	949	2,149	2,124
Supplemental Segment Information:
Capital expenditures	2,497	985	5,660	3,251
CANADA
Segment Reporting Information [Line Items]
Revenue	31,418	30,233	88,471	92,253
Other Regions [Member]
Segment Reporting Information [Line Items]
Revenue	54,680	44,515	153,714	103,394
UNITED STATES
Segment Reporting Information [Line Items]
Revenue	$ 289,702	$ 274,506	$ 868,847	$ 799,696

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Segment Information (Details 1) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) reportable_segment	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | reportable_segment			4
Net Income (Loss) Attributable to Parent	$ 18,493	$ (32,140)	$ 19,180	$ (54,937)
Depreciation, Depletion and Amortization, Nonproduction	11,252	11,412	32,916	34,068
Share-based Compensation	6,380	5,228	16,870	15,443
Revenue	375,800	349,254	1,111,032	995,343
Income (Loss) from Equity Method Investments	1,422	70	1,924	9
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	21,984	(31,081)	25,768	(51,765)
Net Income (Loss) Attributable to Noncontrolling Interest	3,491	1,059	6,588	3,172	$ 5,218
Cost of Services	249,418	235,659	754,803	675,940
General and Administrative Expense	77,910	83,303	251,313	233,840
Operating Income (Loss)	37,220	(10,751)	72,000	21,864
Other Nonoperating Income (Expense)	8,649	(6,008)	17,812	9,530
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	29,611	(33,081)	41,503	(50,594)
Income Tax Expense (Benefit)	9,049	(1,930)	17,659	1,180
Income Loss From Continuing Operations Before Equity In Earnings Of Non-consolidated Affiliates	20,562	(31,151)	23,844	(51,774)
Payments to Acquire Property, Plant, and Equipment	7,149	6,274	28,305	19,723
United States [Member]
Segment Reporting Information [Line Items]
Revenue	289,702	274,506	868,847	799,696
Canada [Member]
Segment Reporting Information [Line Items]
Revenue	31,418	30,233	88,471	92,253
Other Regions [Member]
Segment Reporting Information [Line Items]
Revenue	54,680	44,515	153,714	103,394
Domestic Creative Agencies [Member]
Segment Reporting Information [Line Items]
Share-based Compensation	177	150	502	487
Revenue	24,173	22,181	67,473	66,274
Operating Income (Loss)	5,716	4,688	13,563	14,779
Payments to Acquire Property, Plant, and Equipment	324	222	874	920
Specialized Communications [Member]
Segment Reporting Information [Line Items]
Share-based Compensation	659	564	2,264	1,556
Revenue	40,670	40,309	125,470	123,006
Operating Income (Loss)	4,775	11,101	13,410	17,860
Payments to Acquire Property, Plant, and Equipment	206	56	673	2,183
Media Services [Member]
Segment Reporting Information [Line Items]
Share-based Compensation	150	70	464	187
Revenue	33,027	34,481	103,966	96,681
Operating Income (Loss)	2,421	466	8,618	3,510
Payments to Acquire Property, Plant, and Equipment	2,171	2,008	3,455	2,634
All Other [Member]
Segment Reporting Information [Line Items]
Share-based Compensation	1,077	949	2,149	2,124
Revenue	83,951	75,021	237,188	219,502
Operating Income (Loss)	15,213	(22,828)	31,626	(5,619)
Payments to Acquire Property, Plant, and Equipment	$ 2,497	$ 985	$ 5,660	$ 3,251

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Commitments, Contingencies and Guarantees (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Other Commitments [Line Items]
Redeemable noncontrolling interests	$ 60,092	$ 60,180
Investment commitments	198
Amount of letters of credit outstanding	$ 5,009
Minimum [Member]
Other Commitments [Line Items]
Redeemable noncontrolling interest obligation, year of payment	2017
Maximum [Member]
Other Commitments [Line Items]
Redeemable noncontrolling interest obligation, year of payment	2023
Contractual redemption right [Member]
Other Commitments [Line Items]
Redemption value	$ 15,493
Contractual redemption right [Member] | Common Class A [Member]
Other Commitments [Line Items]
Redemption value	202
Termination or death redemption right [Member]
Other Commitments [Line Items]
Redemption value	42,268
Excess initial redemption value [Member]
Other Commitments [Line Items]
Redemption value	$ 2,330