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Earnings Per Share
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
 
Basic earnings per common share is calculated by dividing net income (loss) by the weighted average number of common shares outstanding. Diluted earnings per share is calculated by dividing net income by the weighted average shares outstanding plus share equivalents that would arise from the exercise of stock options and vesting of restricted common shares and other contingently issuable shares. For the years ended December 31, 2015, 2014 and 2013, respectively, 3.2 million, 2.4 million and 4.3 million options and restricted common shares were excluded from the calculation as these options and restricted common shares were anti-dilutive.
 
The computation of basic and diluted earnings per common share for the years ended December 31, 2015, 2014 and 2013, is as follows (in thousands, except per share amounts):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Numerator:
 
 
 
 
 
Net income (loss)
$
(32,338
)
 
$
44,462

 
$
(8,660
)
 
 
 
 
 
 
Denominator:
 

 
 

 
 

Denominator for basic earnings per share—weighted-average shares outstanding
52,791

 
52,096

 
50,875

Effect of dilutive securities:


 
 

 
 

Employee stock options and restricted common shares
—

 
924

 
—

Contingently issuable shares
—

 
84

 
—

Denominator for diluted earnings per share
52,791

 
53,104

 
50,875

 
 
 
 
 
 
Basic earnings (loss) per share
$
(0.61
)
 
$
0.85

 
$
(0.17
)
Diluted earnings (loss) per share
$
(0.61
)
 
$
0.84

 
$
(0.17
)