CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 46,179	$ 27,921	$ 61,458
Cash held in trust	4,632	5,341
Accounts receivable, less allowance for doubtful accounts of $2,453 and $1,523	434,072	388,340
Inventory, Work in Process, Gross	31,146	33,118
Other current assets	26,742	34,862
Total Current Assets	542,771	489,582
Fixed assets, at cost, less accumulated depreciation of $123,599 and $105,134	90,306	78,377
Investment in non-consolidated affiliates	6,307	4,745
Goodwill	835,935	844,759	870,301
Other intangible assets, net	70,605	85,071
Deferred tax assets	115,325	41,793
Other assets	37,643	33,051
Total Assets	1,698,892	1,577,378
Current Liabilities:
Accounts payable	244,527	251,456
Trust Liability, Current	4,632	5,341
Accrued Liabilities and Other Liabilities	327,812	303,581
Advance billings	148,133	133,925
Current portion of long-term debt	313	228
Total Current Liabilities	775,630	802,821
Long-term debt, less current portion	882,806	936,208
Other liabilities	54,110	56,012
Deferred tax liabilities	6,760	110,359
Total Liabilities	1,791,519	2,026,674
Redeemable Noncontrolling Interest, Equity, Redemption Value	62,886	60,180
Commitments, Contingencies and Guarantees (See Note 17)
Shareholders’ Deficit:
Convertible preference shares (liquidation preference $101,352)	90,220	0
Common Stock, Value, To be Issued	0	2,360
Charges in excess of capital	(314,241)	(311,581)
Accumulated deficit	(340,000)	(581,848)
Accumulated other comprehensive loss	(1,954)	(1,824)	6,257
MDC Partners Inc. Shareholders’ Deficit	(213,543)	(575,109)
Noncontrolling Interests	58,030	65,633
Total Shareholders’ Deficit	(155,513)	(509,476)	$ (496,092)
Total Liabilities, Redeemable Noncontrolling Interests and Shareholders’ Deficit	1,698,892	1,577,378
Common Class A
Shareholders’ Deficit:
Common stock	352,432	317,784
Contingent and fixed payments [Member]
Current Liabilities:
Current portion of deferred acquisition consideration	50,213	108,290
Long-term portion of deferred acquisition consideration	$ 72,213	$ 121,274