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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 | 3,755 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | 687 |  |  |  |  |  |  |  |  |  | 687 |  | 687 | 0
Other Comprehensive income (loss) | 618 |  |  |  |  |  |  |  |  |  |  | (653) | (653) | 1,271
Issuance of restricted stock | $ 0 |  |  | $ 3,593 |  |  |  |  | (3,593) |  |  |  | $ 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) |  |  |  | 173,550 |  |  |  |  |  |  |  |  |  |
Shares acquired and cancelled | (630) |  |  | $ (630) |  |  |  |  |  |  |  |  | (630) |
Stock Issued During Period, Shares, New Issues |  |  |  | 3,353,939 |  |  |  |  |  |  |  |  |  |
Shares acquired and cancelled (in shares) |  |  |  | (69,225) |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 3,769 |  |  |  |  |  |  |  | 3,769 |  |  |  | 3,769 |
Temporary Equity, Accretion to Redemption Value | (2,783) |  |  |  |  |  |  |  | (2,783) |  |  |  | (2,783) |
Noncontrolling Interest, Increase from Business Combination | (9,295) |  |  |  |  |  |  |  | 2,652 |  |  |  | 2,652 |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | 11,947 |  |  |  |  |  |  |  |  |  |  |  |  | (11,947)
Transfer to charges in excess of capital |  |  |  |  |  |  |  |  | (1,530) | 1,530 |  |  |  |
Balance at Jun. 30, 2017 | (399,038) |  | $ 90,220 |  |  |  |  |  | 0 | (310,051) | (581,161) | (2,477) | (453,995) | 54,957
Balance (in shares) at Jun. 30, 2017 |  |  | 95,000 | 56,260,322 | 56,256,567 |  |  |  |  |  |  |  |  |
Balance (in shares) at Mar. 31, 2017 |  |  |  |  |  | 3,755 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | 11,253 |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive income (loss) | 550 |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | 11,947 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2017 | $ (399,038) |  | $ 90,220 |  |  |  |  |  | $ 0 | $ (310,051) | $ (581,161) | $ (2,477) | $ (453,995) | $ 54,957
Balance (in shares) at Jun. 30, 2017 |  |  | 95,000 | 56,260,322 | 56,256,567 |  |  |  |  |  |  |  |  |
Common Stock, Value, Issued |  | $ 349,474 |  | $ 349,474 |  |  |  |  |  |  |  |  |  |
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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