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CONDENSED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($) $ in Thousands | Total | Common Class A | Series 4 Convertible Preferred Stock [Domain] | 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. | (10,566) |  |  |  |  |  |  |  |  |  |  | (10,566) |  | (10,566) | 0
Other Comprehensive income (loss) | 68 |  |  |  |  |  |  |  |  |  |  |  | (197) | (197) | 265
Issuance of restricted stock | $ 0 |  |  |  | $ 262 |  |  |  |  | (262) |  |  |  | $ 0 |
Stock Issued During Period, Shares, New Issues | 90,220,000 |  | 95,000 | 95,000 |  |  |  |  |  |  |  |  |  | 90,220,000 |
Stock Issued During Period, Value, Convertible Preferred Shares |  |  |  | $ 90,220 |  |  |  |  |  |  |  |  |  |  |
Deferred acquisition consideration settled through issuance of shares | $ 4,153 |  |  |  | $ 5,028 |  |  |  |  | 1,485 |  |  |  | $ 4,153 |
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) |  |  |  |  | 17,000 |  |  |  |  |  |  |  |  |  |
Shares acquired and cancelled | (51) |  |  |  | $ (51) |  |  |  |  |  |  |  |  | (51) |
Stock Issued During Period, Shares, New Issues |  |  |  |  | 568,182 |  |  |  |  |  |  |  |  |  |
Shares acquired and cancelled (in shares) |  |  |  |  | (5,548) |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 1,682 |  |  |  |  |  |  |  |  | 1,682 |  |  |  | 1,682 |
Temporary Equity, Accretion to Redemption Value | (195) |  |  |  |  |  |  |  |  | (195) |  |  |  | (195) |
Noncontrolling Interest, Increase from Business Combination | 63 |  |  |  |  |  |  |  |  | 63 |  |  |  | 63 |
Transfer to charges in excess of capital |  |  |  |  |  |  |  |  |  | (2,773) | 2,773 |  |  |  |
Balance at Mar. 31, 2017 | $ (424,102) |  |  | $ 90,220 |  |  |  |  |  | $ 0 | $ (308,808) | $ (592,414) | $ (2,021) | $ (490,000) | $ 65,898
Balance (in shares) at Mar. 31, 2017 |  |  |  | 95,000 | 53,381,692 | 53,377,937 | 3,755 |  |  |  |  |  |  |  |
Common Stock, Value, Issued |  | $ 323,023 |  |  | $ 323,023 |  |  |  |  |  |  |  |  |  |
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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