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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands | Total | Convertible Preferred Stock Series 4 Convertible Preferred Stock | Common Stock | Common Stock Common Class A [Member] | Additional Paid-in Capital | Charges in Excess of Capital | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss) | MDC Partners Inc. Shareholders' Deficit | Noncontrolling Interest | Contingent Consideration, Liability Settlements [Domain] | Contingent Consideration, Liability Settlements [Domain] MDC Partners Inc. Shareholders' Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Stock Issued During Period, Shares, Acquisitions | 1,011,561 |  |  |  |  |  |  |  |  |  |  |
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 | 56,371,376 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | (26,010) |  |  |  |  |  |  |  | (26,010) |  |  |
Other comprehensive income (loss) | 429 |  |  |  |  |  |  | 2,435 | 2,435 | (2,006) |  |
Issuance of Series 4 convertible preference shares in private placement (in shares) |  | 0 |  |  |  |  |  |  |  |  |  |
Expenses for convertible preference shares (Note 9) | (97) | $ (97) |  |  |  |  |  |  | (97) |  |  |
Issuance of restricted stock | 0 |  | $ 1,354 |  | (1,354) |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  |  | 122,029 |  |  |  |  |  |  |  |  |
Shares acquired and cancelled | (493) |  | $ (493) |  |  |  |  |  | (493) |  |  |
Shares acquired and cancelled (in shares) |  |  | (54,693) |  |  |  |  |  |  |  |  |
Stock-based compensation | 4,324 |  |  |  | 4,324 |  |  |  | 4,324 |  |  |
Changes in redemption value of redeemable noncontrolling interests | (2,062) |  |  |  | (2,062) |  |  |  | (2,062) |  |  |
Increase (decrease) in noncontrolling interests and redeemable noncontrolling interests from business acquisitions and step-up transactions | 26,191 |  |  |  | (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 |  |  |  | 258 | (258) |  |  |  |  |  |
Balance at Jun. 30, 2018 | $ (153,336) | $ 90,123 | $ 360,323 |  | $ 0 | $ (314,499) | $ (367,180) | $ 481 | $ (230,752) | $ 77,416 |  |
Balance (in shares) at Jun. 30, 2018 |  | 95,000 | 57,454,028 | 57,450,273 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  |  | $ 7,030 |  |  |  |  |  |  | $ 7,030 | $ 7,030

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