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Loss Per Common Share
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Loss Per Common Share
Loss) Per Common 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


Anti-dilutive stock awards     1,524,218 -     1,524,218 -

Restricted stock and restricted stock unit awards of 1,015,637 and 1,443,921 for the three and nine months ended September 30, 2018 and 2017, respectively, which are contingent upon the Company meeting a cumulative three year earnings target (2018, 2019 and 2020) and contingent upon continued employment, are excluded from the computation of diluted income per common share as the contingency was not satisfied at September 30, 2018 or 2017. In addition, there were 95,000 shares of Preference Shares outstanding which were convertible into 10,755,602 and 9,936,514 Class A common shares at September 30, 2018 and 2017, respectively. These Preference Shares were anti-dilutive for each period presented in the table above and are therefore excluded from the diluted income (loss) per common share calculation.