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Loss Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 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:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Numerator |  |  |  |  |  |  |  |
Net income (loss) attributable to MDC Partners Inc. | $ | 3,406 |  |  | $ | 11,253 |  |  | $ | (26,010 | ) |  | $ | 687 |
Accretion on convertible preference shares | (2,068 | ) |  | (1,910 | ) |  | (4,095 | ) |  | (2,417 | )
Net income allocated to convertible preference shares | (205 | ) |  | (1,383 | ) |  | — |  |  | — |
Numerator for basic income (loss) per common share - Net income (loss) attributable to MDC Partners Inc. common shareholders | 1,133 |  |  | 7,960 |  |  | (30,105 | ) |  | (1,730 | )
Adjustment to net income allocated to convertible preference shares | 1 |  |  | 6 |  |  | — |  |  | — |
Numerator for diluted income (loss) per common share- Net income (loss) attributable to MDC Partners Inc. common shareholders | $ | 1,134 |  |  | $ | 7,966 |  |  | $ | (30,105 | ) |  | $ | (1,730 | )
Denominator |  |  |  |  |  |  |  |
Denominator for basic income (loss) per common share - weighted average common shares | 57,439,823 |  |  | 55,332,497 |  |  | 56,924,208 |  |  | 53,480,144 |
Impact of stock options and non-vested stock under employee stock incentive plans | 363,049 |  |  | 289,697 |  |  | — |  |  | — |
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions | 57,802,872 |  |  | 55,622,194 |  |  | 56,924,208 |  |  | 53,480,144 |
Basic income (loss) per common share | $ | 0.02 |  |  | $ | 0.14 |  |  | $ | (0.53 | ) |  | $ | (0.03 | )
Diluted income (loss) per common share | $ | 0.02 |  |  | $ | 0.14 |  |  | $ | (0.53 | ) |  | $ | (0.03 | )

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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://www.xbrl.org/2003/role/presentationRef -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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