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Loss Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2018
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 
 June 30,
 
Six Months Ended 
 June 30,
 
2018

2017
 
2018
 
2017
Numerator
 

 

 
 
 
 
Net income (loss) attributable to MDC Partners Inc.
$
3,406

 
$
11,253

 
$
(26,010
)
 
$
687

Accretion on convertible preference shares
(2,068
)

(1,910
)
 
(4,095
)
 
(2,417
)
Net income allocated to convertible preference shares
(205
)
 
(1,383
)
 
—

 
—

Numerator for basic income (loss) per common share - Net income (loss) attributable to MDC Partners Inc. common shareholders
1,133


7,960

 
(30,105
)
 
(1,730
)
Adjustment to net income allocated to convertible preference shares
1

 
6

 
—

 
—

Numerator for diluted income (loss) per common share- Net income (loss) attributable to MDC Partners Inc. common shareholders
$
1,134


$
7,966

 
$
(30,105
)
 
$
(1,730
)
Denominator




 
 
 
 
Denominator for basic income (loss) per common share - weighted average common shares
57,439,823


55,332,497

 
56,924,208

 
53,480,144

Impact of stock options and non-vested stock under employee stock incentive plans
363,049

 
289,697

 
—

 
—

Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions
57,802,872


55,622,194

 
56,924,208

 
53,480,144

Basic income (loss) per common share
$
0.02


$
0.14

 
$
(0.53
)
 
$
(0.03
)
Diluted income (loss) per common share
$
0.02

 
$
0.14


$
(0.53
)
 
$
(0.03
)