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Loss Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share | The following table sets forth the computation of basic and diluted loss per common share:
| Three Months Ended March 31,
| 2018 |  | 2017
Numerator |  |  |  |
Net loss attributable to MDC Partners Inc. | $ | (29,416 | ) |  | $ | (10,566 | )
Accretion on convertible preference shares | (2,027 | ) |  | (507 | )
Net income allocated to convertible preference shares | — |  |  | — |
Numerator for basic loss per common share - Net loss attributable to MDC Partners Inc. common shareholders | (31,443 | ) |  | (11,073 | )
Effect of dilutive securities: | — |  |  | — |
Numerator for diluted loss per common share- Net loss attributable to MDC Partners Inc. common shareholders | $ | (31,443 | ) |  | $ | (11,073 | )
Denominator |  |  |  |
Denominator for basic loss per common share - weighted average common shares | 56,415,042 |  |  | 52,998,244 |
Effect of dilutive securities: | — |  |  | — |
Denominator for diluted loss per common share - adjusted weighted shares and assumed conversions | 56,415,042 |  |  | 52,998,244 |
Basic loss per common share | $ | (0.56 | ) |  | $ | (0.21 | )
Diluted loss per common share | $ | (0.56 | ) |  | $ | (0.21 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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