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Loss Per Common Share | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Loss Per Common Share | Loss Per Common 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 | )
As of March 31, 2018, options and other rights to purchase 1,561,856 shares of common stock were outstanding, all of which were anti-dilutive during the three months ended March 31, 2018, and therefore excluded from the computation of diluted loss per common share. Additionally, 1,343,781 shares of non-vested restricted stock and restricted stock unit awards, which are contingent upon the Company meeting an undefined cumulative three year earnings target and continued employment, are excluded from the computation of diluted income per common share as the contingency has not been satisfied at March 31, 2018. Lastly, there were 95,000 shares of Preference Shares outstanding which were convertible into 10,337,949 Class A common shares at March 31, 2018. These Preference Shares were anti-dilutive for the three months ended March 31, 2018, and are therefore excluded from the diluted loss per common share calculation for the period. As of March 31, 2017, options and other rights to purchase 1,263,635 shares of common stock were outstanding, of which 898,635 shares of non-vested restricted stock and restricted stock units were anti-dilutive during the three months ended March 31, 2018 and therefore excluded from the computation of diluted income per common share. Additionally, 1,445,921 shares of non-vested restricted stock and restricted stock unit awards, which are contingent upon the Company meeting an undefined cumulative three year earnings target and continued employment, are excluded from the computation of diluted income per common share as the contingency had not been satisfied as of March 31, 2017. Lastly, there were 95,000 shares of Preference Shares outstanding which were convertible into 9,550,667 Class A common shares at March 31, 2017. These Preference Shares were anti-dilutive for the three months ended March 31, 2017 and were therefore excluded from the diluted loss per common share calculation for the period.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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