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Loss Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2017
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 September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Numerator |  |  |  |  |  |  |  |
Net income (loss) attributable to MDC Partners Inc. | $ | 18,493 |  |  | $ | (32,140 | ) |  | $ | 19,180 |  |  | $ | (54,937 | )
Accretion on convertible preference shares | (1,948 | ) |  | — |  |  | (4,365 | ) |  | — |
Net income allocated to convertible preference shares | (2,408 | ) |  | — |  |  | (1,782 | ) |  | — |
Numerator for basic loss per common share - Net income (loss) attributable to MDC Partners Inc. common shareholders | 14,137 |  |  | (32,140 | ) |  | 13,033 |  |  | (54,937 | )
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |
Adjustment to net income allocated to convertible preference shares | 13 |  |  | — |  |  | 9 |  |  | — |
Numerator for diluted income (loss) per common share- Net income (loss) attributable to MDC Partners Inc. common shareholders | $ | 14,150 |  |  | $ | (32,140 | ) |  | $ | 13,042 |  |  | $ | (54,937 | )
Denominator |  |  |  |  |  |  |  |
Denominator for basic income (loss) per common share - weighted average common shares | 57,566,707 |  |  | 52,244,819 |  |  | 53,915,536 |  |  | 50,861,890 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |
Impact of stock options and non-vested stock under employee stock incentive plans | 376,373 |  |  | — |  |  | 312,672 |  |  | — |
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions | 57,943,080 |  |  | 52,244,819 |  |  | 54,228,208 |  |  | 50,861,890 |
Basic income (loss) per common share | $ | 0.25 |  |  | $ | (0.62 | ) |  | $ | 0.24 |  |  | $ | (1.08 | )
Diluted income (loss) per common share | $ | 0.24 |  |  | $ | (0.62 | ) |  | $ | 0.24 |  |  | $ | (1.08 | )

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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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