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Noncontrolling and Redeemable Noncontrolling Interests - Changes in Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Noncontrolling Interest [Line Items] |  |  |  |  |
Net loss attributable to MDC Partners Inc. | $ 4,290 | $ 3,406 | $ 3,406 | $ 4,177 | $ (26,010)
Change from net loss attributable to MDC Partners Inc. and transfers to noncontrolling interests | (4,193) | (3,406) |  | (4,080) | 27,176
MDC Partners Inc. Shareholders' Deficit |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Net loss attributable to MDC Partners Inc. |  |  | $ 3,406 |  | (26,010)
Decrease in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of redeemable noncontrolling interests and noncontrolling interests | $ 97 | $ 0 |  | $ 97 | $ 1,166

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