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Income (Loss) Per Common Share (Tables)
3 Months Ended
Mar. 31, 2021
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 March 31,
 20212020
Numerator: 
Net income attributable to MDC Partners Inc.$5,010 $1,002 
Accretion on convertible preference shares(3,724)(3,440)
Net income allocated to convertible preference shares(365)— 
Net income (loss) attributable to MDC Partners Inc. common shareholders$921 $(2,438)
Adjustment to net income allocated to convertible preference shares 7— 
Net income (loss) attributable to MDC Partners Inc. common shareholders - Diluted$928 $(2,438)
Denominator:
Basic weighted average number of common shares outstanding73,392,824 72,397,661 
Diluted weighted average number of common shares outstanding75,439,066 72,397,661 
Basic$0.01 $(0.03)
Diluted$0.01 $(0.03)