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Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | $ (1,752) | $ (16,125) | $ (16,125) | $ (42,135) | $ 2,425 | $ (42,135)
Numerator |  |  |  |  |  |
Accretion on and net income allocated to convertible preference shares |  | 2,109 |  |  |  |
Net loss attributable to MDC Partners Inc. common shareholders | $ (5,058) | $ (18,234) |  |  | $ (6,506) | $ (48,339)
Denominator |  |  |  |  |  |
Denominator for basic income (loss) per common share - weighted average common shares | 72,044,480 | 57,498,661 |  |  | 68,154,306 | 57,117,797
Weighted Average Number Diluted Shares Outstanding Adjustment | 0 | 0 |  |  | 0 | 0
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions | 72,044,480 | 57,498,661 |  |  | 68,154,306 | 57,117,797
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) | $ (0.07) | $ (0.32) |  |  | $ (0.10) | $ (0.85)
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) | $ (0.07) | $ (0.32) |  |  | $ (0.10) | $ (0.85)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 3,714,595,000 |  |  |  |  |
Adjustment to Net Income, Allocated to Convertible Shares | $ 0 | $ 0 |  |  | $ 0 | $ 0
Income (Loss) from Continuing Operations Attributable to Parent, Diluted | (5,058) | (18,234) |  |  | (6,506) | (48,339)
MDC Partners Inc. Shareholders' Deficit |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. |  |  | $ (16,125) | $ (42,135) |  |
Series 4 Convertible Preferred Stock | Convertible Preferred Stock |  |  |  |  |  |
Numerator |  |  |  |  |  |
Accretion on and net income allocated to convertible preference shares | 3,306 | 2,109 |  |  | 8,931 | $ 6,204
Net Income Allocated to Convertible Shares | 0 | $ 0 |  |  | $ 0 |
Denominator |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 1,524,218,000 |  |  | 3,714,595,000 | 1,524,218,000
Series 4 Convertible Preferred Stock [Domain] | Convertible Preferred Stock |  |  |  |  |  |
Numerator |  |  |  |  |  |
Accretion on and net income allocated to convertible preference shares | $ 3,306 |  |  |  |  | $ 6,204
Net Income Allocated to Convertible Shares |  |  |  |  |  | $ 0

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