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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($) $ in Thousands | Total | Convertible Preferred Stock | Common Stock | Additional Paid-in Capital | Accumulated Deficit | AOCI Attributable to Parent [Member] | MDC Partners Inc. Shareholders' Deficit | Noncontrolling Interest | Series 4 Convertible Preferred Stock [Member] Convertible Preferred Stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ (246,967) | $ 90,123 |  | $ 58,579 | $ (464,903) | $ 4,720 | $ (311,481) | $ 64,514 |
Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  |  |  | 95,000,000
Common stock, balance (in shares) at Dec. 31, 2018 |  |  | 57,521,323 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | (113) |  |  |  | (113) |  | (113) |  |
Other comprehensive income (loss) | (4,659) |  |  |  |  | (5,010) | (5,010) | 351 |
Issuance of common and preference shares (in shares) |  | 50,000,000 | 14,285,714 |  |  |  |  |  |
Issuance of common and convertible preference shares | 97,629 | $ 61,994 |  | 35,635 |  |  | 97,629 |  |
Issuance of restricted stock (in shares) |  |  | 117,000 |  |  |  |  |  |
Shares acquired and cancelled | (56) |  |  | (56) |  |  | (56) |  |
Shares acquired and cancelled (in shares) |  |  | (34,016) |  |  |  |  |  |
Stock-based compensation | (1,291) |  |  | (1,291) |  |  | (1,291) |  |
Changes in redemption value of redeemable noncontrolling interests | 5,919 |  |  | 5,919 |  |  | 5,919 |  |
Changes in ownership interest | (24,735) |  |  | (93) |  |  | (93) | (24,642) |
Business acquisitions and step-up transactions, net of tax | 0 |  |  |  |  |  | 0 |  |
Balance at Mar. 31, 2019 | (174,273) | 152,117 |  | 98,693 | (465,016) | (290) | (214,496) | 40,223 |
Balance (in shares) at Mar. 31, 2019 |  |  |  |  |  |  |  |  | 145,000,000
Common stock, balance (in shares) at Mar. 31, 2019 |  |  | 71,890,021 |  |  |  |  |  |
Balance at Dec. 31, 2019 | (179,389) | 152,746 |  | 101,469 | (469,593) | (4,269) | (219,647) | 40,258 |
Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  |  | 145,000,000
Common stock, balance (in shares) at Dec. 31, 2019 |  |  | 72,154,603 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | 1,003 |  |  |  |  |  | 1,003 |  |
Other comprehensive income (loss) | 7,429 |  |  |  |  | 7,938 | 7,938 | (509) |
Issuance of restricted stock | 0 |  |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  |  | 587,227 |  |  |  |  |  |
Shares acquired and cancelled | (637) |  |  | (637) |  |  | (637) |  |
Shares acquired and cancelled (in shares) |  |  | (258,664) |  |  |  |  |  |
Stock-based compensation | 476 |  |  | 476 |  |  | 476 |  |
Changes in redemption value of redeemable noncontrolling interests | (1,218) |  |  | (1,218) |  |  | (1,218) |  |
Business acquisitions and step-up transactions, net of tax | (503) |  |  | (503) |  |  | (503) |  |
Other | 82 |  |  | 0 | 82 | 0 | 82 | 0 |
Balance at Mar. 31, 2020 | $ (172,757) | $ 152,746 |  | $ 99,587 | $ (468,508) | $ 3,669 | $ (212,506) | $ 39,749 |
Balance (in shares) at Mar. 31, 2020 |  |  |  |  |  |  |  |  | 145,000,000
Common stock, balance (in shares) at Mar. 31, 2020 |  |  | 72,483,166 |  |  |  |  |  |

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