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Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | $ (593) | $ 4,290 | $ 410 | $ 4,177 |  |  |
Numerator |  |  |  |  |  |  |
Net income (loss) attributable to MDC Partners Inc. common shareholders | $ (4,102) | $ 775 | $ (6,539) | $ (1,448) | $ (17,557) | $ (138,362) | $ 204,832
Denominator |  |  |  |  |  |  |
Denominator for basic income (loss) per common share - weighted average common shares | 72,528,455 | 71,915,832 | 72,463,058 | 66,118,749 | 69,132,100 | 57,218,994 | 55,255,797
Impact of stock options and non-vested stock under employee stock incentive plans (in shares) | 0 | 108,857 | 0 | 0 |  |  |
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions | 72,528,455 | 72,024,689 | 72,463,058 | 66,118,749 | 69,132,100 | 57,218,994 | 55,481,786
Earnings per share, basic | $ (0.06) | $ 0.01 | $ (0.09) | $ (0.02) | $ (250) | $ (2,420) | $ 3,710
Earnings per share, diluted | $ (0.06) | $ 0.01 | $ (0.09) | $ (0.02) | $ (250) | $ (2,420) | $ 3,700
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 2,912,436,000 |  |  |  |  |  |
MDC Partners Inc. Shareholders' Deficit |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | $ (593) | $ 4,290 | $ 410 | $ 4,177 |  |  |
Series 4 Convertible Preferred Stock | Convertible Preferred Stock |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |
Accretion on and net income allocated to convertible preference shares | 3,509 | 3,242 | 6,949 | 5,625 |  |  |
Net income allocated to convertible preference shares | $ 0 | $ (273) | $ 0 | $ 0 |  |  |
Denominator |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 2,662,666,000 |  |  |  |  |

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