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Loss Per Common Share (Tables)
 9 Months Ended
Sep. 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 
 September 30,
 
Nine Months Ended 
 September 30,
 
2018

2017
 
2018
 
2017
Numerator
 

 

 
 
 
 
Net income (loss) attributable to MDC Partners Inc.
$
(16,125
)
 
$
18,493

 
$
(42,135
)
 
$
19,180

Accretion on convertible preference shares
(2,109
)

(1,948
)
 
(6,204
)
 
(4,365
)
Net income allocated to convertible preference shares
—

 
(2,408
)
 
—

 
(1,782
)
Numerator for basic income (loss) per common share - Net income (loss) attributable to MDC Partners Inc. common shareholders
(18,234
)

14,137

 
(48,339
)
 
13,033

Adjustment to net income allocated to convertible preference shares
—

 
13

 
—

 
9

Numerator for diluted income (loss) per common share- Net income (loss) attributable to MDC Partners Inc. common shareholders
$
(18,234
)

$
14,150

 
$
(48,339
)
 
$
13,042

Denominator




 
 
 
 
Denominator for basic income (loss) per common share - weighted average common shares
57,498,661


57,566,707

 
57,117,797

 
53,915,536

Impact of stock options and non-vested stock under employee stock incentive plans
—

 
376,373

 
—

 
312,672

Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions
57,498,661


57,943,080

 
57,117,797

 
54,228,208

Basic income (loss) per common share
$
(0.32
)

$
0.25

 
$
(0.85
)
 
$
0.24

Diluted income (loss) per common share
$
(0.32
)
 
$
0.24


$
(0.85
)
 
$
0.24