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Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Class of Stock [Line Items] |  |
Net loss attributable to MDC Partners Inc. | $ 1,003 | $ (113)
Numerator |  |
Net loss attributable to MDC Partners Inc. common shareholders | (2,437) | (2,496)
Net loss attributable to MDC Partners Inc. common shareholders | $ (2,437) | $ (2,496)
Denominator |  |
Denominator for basic income (loss) per common share - weighted average common shares | 72,397,661 | 60,258,102
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions | 72,397,661 | 60,258,102
Earnings per share, basic | $ (0.03) | $ (0.04)
Earnings per share, diluted | $ (0.03) | $ (0.04)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 2,835,770,000 |
MDC Partners Inc. Shareholders' Deficit |  |
Class of Stock [Line Items] |  |
Net loss attributable to MDC Partners Inc. | $ 1,003 | $ (113)
Series 4 Convertible Preferred Stock | Convertible Preferred Stock |  |
Numerator |  |
Accretion on and net income allocated to convertible preference shares | 3,440 | $ 2,383
Denominator |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 1,633,464,000
Series 4 Convertible Preferred Stock [Domain] | Convertible Preferred Stock |  |
Numerator |  |
Accretion on and net income allocated to convertible preference shares | $ (3,440) | $ (2,383)

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