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Loss per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2018
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 for the years ended December 31:
| 2018 |  | 2017 |  | 2016
Numerator: |  |  |  |  |  |  |  |
Net income (loss) attributable to MDC Partners Inc. | $ | (123,733 | ) |  | $ | 241,848 |  |  | $ | (45,839 | )
Accretion on convertible preference shares | (8,355 | ) |  | (6,352 | ) |  | — |
Net income allocated to convertible preference shares | — |  |  | (29,902 | ) |  | — |
Net income (loss) attributable to MDC Partners Inc. common shareholders | (132,088 | ) |  | 205,594 |  |  | (45,839 | )
Adjustment to net income allocated to convertible preference shares | — |  |  | 106 |  |  | — |
Net income (loss) attributable to MDC Partners Inc. common shareholders | $ | (132,088 | ) |  | $ | 205,700 |  |  | $ | (45,839 | )
Denominator: |  |  |  |  |  |  |  |
Basic weighted average number of common shares outstanding | 57,218,994 |  |  | 55,255,797 |  |  | 51,345,807 |
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 | 57,218,994 |  |  | 55,481,786 |  |  | 51,345,807 |
Net income (loss) attributable to MDC Partners Inc. common shareholders per common share: |  |  |  |  |
Basic | $ | (2.31 | ) |  | $ | 3.72 |  |  | $ | (0.89 | )
Diluted | $ | (2.31 | ) |  | $ | 3.71 |  |  | $ | (0.89 | )

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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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