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Income (Loss) Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2020
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:
|  | 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) |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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