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Loss per Common Share
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Loss per Common Share
. Income (Loss) per Common Share
The following table sets forth the computation of basic and diluted income (loss) per common share for the years ended December 31:
 
2018
 
2017
 
2016
Numerator:
  

 
  

 
  

Net income (loss) attributable to MDC Partners Inc.
$
(123,733
)
 
$
241,848

 
$
(45,839
)
Accretion on convertible preference shares
(8,355
)
 
(6,352
)
 
—

Net income allocated to convertible preference shares
—

 
(29,902
)
 
—

Net income (loss) attributable to MDC Partners Inc. common shareholders
(132,088
)
 
205,594

 
(45,839
)

 
 
 
 
 
Adjustment to net income allocated to convertible preference shares
—

 
106

 
—

Net income (loss) attributable to MDC Partners Inc. common shareholders
$
(132,088
)
 
$
205,700

 
$
(45,839
)
Denominator:
  

 
  

 
  

Basic weighted average number of common shares outstanding
57,218,994

 
55,255,797

 
51,345,807

Effect of dilutive securities:
 
 
 
 
 
Impact of stock options and non-vested stock under employee stock incentive plans
—

 
225,989

 
—

Diluted weighted average number of common shares outstanding
57,218,994

 
55,481,786

 
51,345,807

Net income (loss) attributable to MDC Partners Inc. common shareholders per common share:
 
 
 
 
 
Basic
$
(2.31
)
 
$
3.72

 
$
(0.89
)
Diluted
$
(2.31
)
 
$
3.71

 
$
(0.89
)

Anti-dilutive stock awards                         1,442,518 - 1,391,456

Restricted stock and restricted stock unit awards of 1,012,637, 1,443,921, and 503,321 for the twelve months ended December 31, 2018, 2017, and 2016, 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 contingencies were not satisfied at December 31, 2018, 2017, and 2016, respectively. In addition, there were 95,000 shares of Preference Shares outstanding which were convertible into 10,970,714 and 10,135,244 Class A common shares at December 31, 2018 and 2017, respectively. These Preference Shares were anti-dilutive for the twelve months ended December 31, 2018 and 2017 and are therefore excluded from the diluted income (loss) per common share calculation.