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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 from continuing operations for the years ended December 31:
 
2017
 
2016
 
2015
Numerator:
  

 
  

 
  

Income (loss) from continuing operations
$
257,223

 
$
(40,621
)
 
$
(20,119
)
Net income attributable to the noncontrolling interests
(15,375
)
 
(5,218
)
 
(9,054
)
Net income (loss) from continuing operations attributable to MDC Partners Inc.
$
241,848

 
$
(45,839
)
 
$
(29,173
)
Accretion on convertible preference shares
(6,352
)
 
—

 
—

Net income allocated to convertible preference shares
(29,902
)
 
—

 
—

Net income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders
205,594

 
(45,839
)
 
(29,173
)
Effect of dilutive securities:
 
 
 
 
 
Adjustment to net income allocated to convertible preference shares
106

 
—

 
—

Net income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders
$
205,700

 
$
(45,839
)
 
$
(29,173
)
Denominator:
  

 
  

 
  

Basic weighted average number of common shares outstanding
55,255,797

 
51,345,807

 
49,875,282

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
55,481,786

 
51,345,807

 
49,875,282

Net income (loss) from continuing operations attributable to MDC Partners Inc common shareholders per common share:
 
 
 
 
 
Basic
$
3.72

 
$
(0.89
)
 
$
(0.58
)
Diluted
$
3.71

 
$
(0.89
)
 
$
(0.58
)

At December 31, 2017, 2016 and 2015, options and other rights to purchase 886,596, 1,391,456 and 947,465 shares of common stock, respectively, were not included in the computation of diluted loss per common share because doing so would have had an anti-dilutive effect. Additionally, 1,433,921 shares of non-vested restricted stock and restricted stock unit awards, which are contingent upon the Company meeting an undefined cumulative three year earnings target and continued employment, are excluded from the computation of diluted income per common share as the contingency has not been satisfied at December 31, 2017. Lastly, there were 95,000 shares of Preference Shares outstanding which were convertible into 10,135,244 Class A common shares at December 31, 2017. These Preference Shares were anti-dilutive for year ended December 31, 2017 and are therefore excluded from the diluted income per common share calculation for the period.