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Income (Loss) Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2019
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 income (loss) per common share:
|  | Twelve Months Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |
Net income (loss) attributable to MDC Partners Inc. |  | $ | (4,690 | ) |  | $ | (123,733 | ) |  | $ | 241,848 |
Accretion on convertible preference shares |  | (12,304 | ) |  | (8,355 | ) |  | (6,352 | )
Net income allocated to convertible preference shares |  | — |  |  | — |  |  | (29,902 | )
Net income (loss) attributable to MDC Partners Inc. common shareholders |  | $ | (16,994 | ) |  | $ | (132,088 | ) |  | $ | 205,594 |
Adjustment to net income allocated to convertible preference shares |  | — |  |  | — |  |  | 106 |
Numerator for dilutive income (loss) per common share: |  |  |  |  |  |
Net income (loss) attributable to MDC Partners Inc. common shareholders |  | $ | (16,994 | ) |  | $ | (132,088 | ) |  | $ | 205,700 |
Denominator: |  |  |  |  |  |
Basic weighted average number of common shares outstanding |  | 69,132,100 |  |  | 57,218,994 |  |  | 55,255,797 |
Effect of dilutive securities: |  |  |  |  |  |
Impact of stock options and non-vested stock under employee stock incentive plans |  | — |  |  | — |  |  | 225,989 |
Diluted weighted average number of common shares outstanding |  | 69,132,100 |  |  | 57,218,994 |  |  | 55,481,786 |
Basic |  | $ | (0.25 | ) |  | $ | (2.31 | ) |  | $ | 3.72 |
Diluted |  | $ | (0.25 | ) |  | $ | (2.31 | ) |  | $ | 3.71 |

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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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