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Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | $ 4,076 |  | $ (1,752) |  |  | $ 4,486 | $ 2,425
Numerator |  |  |  |  |  |  |
Net income (loss) attributable to MDC Partners Inc. common shareholders | $ 360 | $ (17,557) | $ (5,058) | $ (138,362) | $ 204,832 | $ (6,042) | $ (6,506)
Denominator |  |  |  |  |  |  |
Denominator for basic income (loss) per common share - weighted average common shares | 73,207,619 | 69,132,100 | 72,044,480 | 57,218,994 | 55,255,797 | 72,713,257 | 68,154,306
Impact of stock options and non-vested stock under employee stock incentive plans (in shares) | 269,160 |  | 0 |  |  | 0 | 0
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions | 73,476,779 | 69,132,100 | 72,044,480 | 57,218,994 | 55,481,786 | 72,713,257 | 68,154,306
Earnings per share, basic | $ 0 | $ (250) | $ (0.07) | $ (2,420) | $ 3,710 | $ (0.08) | $ (0.10)
Earnings per share, diluted | $ 0 | $ (250) | $ (0.07) | $ (2,420) | $ 3,700 | $ (0.08) | $ (0.10)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 2,325,800,000 |  |  |  |  | 3,539,060,000 |
MDC Partners Inc. Shareholders' Deficit |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | $ 4,076 |  | $ (1,752) |  |  | $ 4,486 | $ 2,425
Series 4 Convertible Preferred Stock | Convertible Preferred Stock |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |
Accretion on and net income allocated to convertible preference shares | 3,579 |  | 3,306 |  |  | 10,528 | 8,931
Net income allocated to convertible preference shares | $ (137) |  | $ 0 |  |  | $ 0 | $ 0
Denominator |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  | 3,714,595,000 |  |  |  | 3,714,595,000

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