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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands | Total | Convertible Preferred Stock Series 4 Convertible Preferred Stock | Common Stock | Share Capital To Be Issued | Additional Paid-in Capital | Charges in Excess of Capital | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss) | MDC Partners Inc. Shareholders' Deficit | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ (155,513) | $ 90,220 | $ 352,432 |  | $ 0 | $ (314,241) | $ (340,000) | $ (1,954) | $ (213,543) | $ 58,030
Balance (in shares) at Dec. 31, 2017 |  | 95,000 | 56,375,131 |  |  |  |  |  |  |
Common Stock, Shares, To be Issued, beginning (shares) at Dec. 31, 2017 |  |  |  | 0 |  |  |  |  |  |
Common Stock, Value, To be Issued, beginning at Dec. 31, 2017 |  |  |  | $ 0 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | (29,416) |  |  |  |  |  | (29,416) |  | (29,416) |
Other comprehensive income (loss) | 2,278 |  |  |  |  |  |  | 3,379 | 3,379 | (1,101)
Expenses for convertible preference shares (Note 9) | (97) | $ (97) |  |  |  |  |  |  | (97) |
Issuance of restricted stock | 0 |  | $ 1,097 |  | (1,097) |  |  |  |  |
Issuance of restricted stock (in shares) |  |  | 109,444 |  |  |  |  |  |  |
Shares acquired and cancelled | (455) |  | $ (455) |  |  |  |  |  | (455) |
Shares acquired and cancelled (in shares) |  |  | (48,508) |  |  |  |  |  |  |
Stock-based compensation | 2,217 |  |  |  | 2,217 |  |  |  | 2,217 |
Changes in redemption value of redeemable noncontrolling interests | (375) |  |  |  | (375) |  |  |  | (375) |
Increase (decrease) in noncontrolling interests and redeemable noncontrolling interests from business acquisitions and step-up transactions | (1,166) |  |  |  | (1,166) |  |  |  | (1,166) |
Changes in noncontrolling interests and redeemable noncontrolling interests from changes in ownership interest | (5,965) |  |  |  |  |  |  |  |  | (5,965)
Cumulative effect of adoption of ASC 606 (Note 14) | (1,170) |  |  |  |  |  | (1,170) |  | (1,170) |
Transfer to charges in excess of capital | 0 |  |  |  | 421 | (421) |  |  |  |
Balance at Mar. 31, 2018 | $ (189,662) | $ 90,123 | $ 353,074 |  | $ 0 | $ (314,662) | $ (370,586) | $ 1,425 | $ (240,626) | $ 50,964
Balance (in shares) at Mar. 31, 2018 |  | 95,000 | 56,436,067 |  |  |  |  |  |  |
Common Stock, Shares, To be Issued, ending (shares) at Mar. 31, 2018 |  |  |  | 0 |  |  |  |  |  |
Common Stock, Value, To be Issued, ending at Mar. 31, 2018 |  |  |  | $ 0 |  |  |  |  |  |

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