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Income (Loss) Per Common Share | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Loss Per Common Share | Income (Loss) Per Common Share The following table sets forth the computation of basic and diluted income (loss) per common share:
| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Numerator: |  |  |  |  |  |  |
Net income attributable to MDC Partners Inc. | $ | 5,010 |  |  | $ | 1,002 |  |  |  |  |
Accretion on convertible preference shares | (3,724) |  |  | (3,440) |  |  |  |  |
Net income allocated to convertible preference shares | (365) |  |  | — |  |  |  |  |
Net income (loss) attributable to MDC Partners Inc. common shareholders | $ | 921 |  |  | $ | (2,438) |  |  |  |  |
Adjustment to net income allocated to convertible preference shares | 7 |  | — |  |  |  |  |
Net income (loss) attributable to MDC Partners Inc. common shareholders - Diluted | $ | 928 |  |  | $ | (2,438) |  |  |  |  |
Denominator: |  |  |  |  |  |  |
Basic weighted average number of common shares outstanding | 73,392,824 |  |  | 72,397,661 |  |  |  |  |
Diluted weighted average number of common shares outstanding | 75,439,066 |  |  | 72,397,661 |  |  |  |  |
Basic | $ | 0.01 |  |  | $ | (0.03) |  |  |  |  |
Diluted | $ | 0.01 |  |  | $ | (0.03) |  |  |  |  |
Anti-dilutive stock awards 1,920,634 2,835,770 Restricted stock and restricted stock unit awards of 0 and 2,203,717 as of March 31, 2021 and 2020, respectively, are excluded from the computation of diluted income (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 Preference Shares outstanding which were convertible into 29,430,693 and 27,189,411 Class A common shares at March 31, 2021 and 2020, respectively. These Preference Shares were anti-dilutive for each period presented in the table above and are therefore excluded from the diluted income (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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