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Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Class of Stock [Line Items] |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |  |  | 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 | )
Net loss attributable to MDC Partners Inc. | $ 18,493 | $ (32,140) | $ 19,180 | $ (54,937)
Numerator |  |  |  |
Income (Loss) from Continuing Operations Attributable to Parent | 14,137 | (32,140) | 13,033 | (54,937)
Adjustment to Net Income, Allocated to Convertible Shares | 13 | 0 | 9 | 0
Income (Loss) from Continuing Operations Attributable to Parent, Diluted | $ 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: | 376,373 | 0 | 312,672 | 0
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
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) | $ 245.58 | $ (615.18) | $ 241.73 | $ (1,080.12)
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) | $ 244.21 | $ (615.18) | $ 240.50 | $ (1,080.12)
Series 4 Convertible Preferred Stock [Domain] | Convertible Preferred Stock [Member] |  |  |  |
Numerator |  |  |  |
Accretion on convertible preferred shares | $ (1,948) | $ 0 | $ (4,365) | $ 0
Net Income Allocated to Convertible Shares | $ (2,408) | $ 0 | $ (1,782) | $ 0

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