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Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Class of Stock [Line Items] |  |  |  |
Net loss attributable to MDC Partners Inc. | $ 3,406 | $ 11,253 | $ (26,010) | $ 687
Numerator |  |  |  |
Numerator for basic loss per common share - Net loss attributable to MDC Partners Inc. common shareholders | 1,133 | 7,960 | (30,105) | (1,730)
Adjustment to Net Income, Allocated to Convertible Shares | 1 | 6 | 0 | 0
Numerator for diluted loss per common share- Net loss attributable to MDC Partners Inc. common shareholders | $ 1,134 | $ 7,966 | $ (30,105) | $ (1,730)
Denominator |  |  |  |
Denominator for basic income (loss) per common share - weighted average common shares | 57,439,823 | 55,332,497 | 56,924,208 | 53,480,144
Weighted Average Number Diluted Shares Outstanding Adjustment | 363,049 | 289,697 | 0 | 0
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions | 57,802,872 | 55,622,194 | 56,924,208 | 53,480,144
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) | $ 0.02 | $ 0.14 | $ (0.53) | $ (0.03)
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) | $ 0.02 | $ 0.14 | $ (0.53) | $ (0.03)
Series 4 Convertible Preferred Stock | Convertible Preferred Stock |  |  |  |
Numerator |  |  |  |
Accretion on convertible preference shares | $ (2,068) | $ (1,910) | $ (4,095) |
Net income allocated to convertible preference shares | (205) | (1,383) |  |
Series 4 Convertible Preferred Stock [Domain] | Convertible Preferred Stock |  |  |  |
Numerator |  |  |  |
Accretion on convertible preference shares | $ (2,273) | $ (3,293) | (4,095) | $ (2,417)
Net income allocated to convertible preference shares |  |  | $ 0 | $ 0

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- Definition Amount of income (loss) from continuing operations attributable to the parent, and includes adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References No definition available. + Details
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