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Income (Loss) Per Common Share | 12 Months Ended
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Dec. 31, 2020
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:
|  | Twelve Months Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Numerator: |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. |  | $ | (228,971) |  |  | $ | (5,253) |  |  | $ | (130,007) |
Accretion on convertible preference shares |  | (14,179) |  |  | (12,304) |  |  | (8,355) |
Net loss attributable to MDC Partners Inc. common shareholders |  | $ | (243,150) |  |  | $ | (17,557) |  |  | $ | (138,362) |
Denominator: |  |  |  |  |  |
Basic weighted average number of common shares outstanding |  | 72,862,178 |  |  | 69,132,100 |  |  | 57,218,994 |
Dilutive effect of equity awards |  | — |  |  | — |  |  | — |
Diluted weighted average number of common shares outstanding |  | 72,862,178 |  |  | 69,132,100 |  |  | 57,218,994 |
Basic |  | $ | (3.34) |  |  | $ | (0.25) |  |  | $ | (2.42) |
Diluted |  | $ | (3.34) |  |  | $ | (0.25) |  |  | $ | (2.42) |
Anti-dilutive stock awards 5,341,846 5,450,426 1,442,518 Restricted stock and restricted stock unit awards of 642,837, 135,386 and 1,012,637 as of December 31, 2020, 2019 and 2018 respectively, are excluded from the computation of diluted loss per common share because the performance contingency necessary for vesting has not been met as of the reporting date. In addition, there were 145,000, 145,000, and 95,000 Preference Shares outstanding which were convertible into 28,853,621, 26,656,285, and 10,970,714 Class A common shares at December 31, 2020, 2019, and 2018, respectively. These Preference Shares were anti-dilutive for each period presented in the table above and are therefore excluded from the diluted loss per common share calculation.

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