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Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | $ (7,115) | $ (1,752) | $ 4,290 | $ (113) | $ (81,598) | $ (16,125) | $ 3,406 | $ (29,416) | $ (4,690) | $ (123,733) | $ 241,848
Numerator |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to MDC Partners Inc. common shareholders |  |  |  |  |  |  |  |  | (16,994) | (132,088) | 205,594
Adjustment to Net Income, Allocated to Convertible Shares |  |  |  |  |  |  |  |  | 0 | 0 | 106
Income (Loss) from Continuing Operations Attributable to Parent, Diluted |  |  |  |  |  |  |  |  | $ (16,994) | $ (132,088) | $ 205,700
Denominator |  |  |  |  |  |  |  |  |  |  |
Denominator for basic income (loss) per common share - weighted average common shares |  |  |  |  |  |  |  |  | 69,132,100 | 57,218,994 | 55,255,797
Weighted Average Number Diluted Shares Outstanding Adjustment |  |  |  |  |  |  |  |  | 0 | 0 | 225,989
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions |  |  |  |  |  |  |  |  | 69,132,100 | 57,218,994 | 55,481,786
Earnings per share, basic |  |  |  |  |  |  |  |  | $ (0.25) | $ (2.31) | $ 3.72
Earnings per share, diluted |  |  |  |  |  |  |  |  | $ (0.25) | $ (2.31) | $ 3.71
Series 4 Convertible Preferred Stock | Convertible Preference Shares |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |
Accretion on and net income allocated to convertible preference shares |  |  |  |  |  |  |  |  | $ 12,304 | $ 8,355 | $ 6,352
Net Income Allocated to Convertible Shares |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ (29,902)
Denominator |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (shares) |  |  |  |  |  |  |  |  | 5,450,426,000 | 1,442,518,000 | 0

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