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Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Class of Stock [Line Items] |  |
Net loss attributable to MDC Partners Inc. | $ (29,416) | $ (10,566)
Numerator |  |
Numerator for basic loss per common share - Net loss attributable to MDC Partners Inc. common shareholders | (31,443) | (11,073)
Numerator for diluted loss per common share- Net loss attributable to MDC Partners Inc. common shareholders | $ (31,443) | $ (11,073)
Denominator |  |
Denominator for basic income (loss) per common share - weighted average common shares | 56,415,042 | 52,998,244
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions | 56,415,042 | 52,998,244
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) | $ (0.56) | $ (0.21)
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) | $ (0.56) | $ (0.21)
Series 4 Convertible Preferred Stock | Convertible Preferred Stock |  |
Numerator |  |
Accretion on convertible preference shares | $ (2,027) | $ (507)
Net income allocated to convertible preference shares | $ 0 | $ 0

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