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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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