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Loss Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2017
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,
 
2017

2016
 
2017
 
2016
Numerator
 

 

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


$
(32,140
)
 
$
19,180

 
$
(54,937
)
Accretion on convertible preference shares
(1,948
)

—

 
(4,365
)
 
—

Net income allocated to convertible preference shares
(2,408
)
 
—

 
(1,782
)
 
—

Numerator for basic loss per common share - Net income (loss) attributable to MDC Partners Inc. common shareholders
14,137


(32,140
)
 
13,033

 
(54,937
)
Effect of dilutive securities:




 


 


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
$
14,150


$
(32,140
)
 
$
13,042

 
$
(54,937
)
Denominator




 
 
 
 
Denominator for basic income (loss) per common share - weighted average common shares
57,566,707


52,244,819

 
53,915,536

 
50,861,890

Effect of dilutive securities:
 



 


 


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
57,943,080


52,244,819

 
54,228,208

 
50,861,890

Basic income (loss) per common share
$
0.25


$
(0.62
)
 
$
0.24

 
$
(1.08
)
Diluted income (loss) per common share
$
0.24

 
$
(0.62
)

$
0.24

 
$
(1.08
)