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Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Schedule of calculation of basic and diluted earnings per share
The following table sets forth the calculations of basic and diluted earnings per share:
 
For the Three Months Ended March 31,
 
2015
 
2014
 
(in thousands, except per share amounts)
Net income (loss)
$
(53,058
)
 
$
65,607

Basic weighted-average common shares outstanding
67,463

 
67,056

Add: dilutive effect of stock options, unvested RSUs, and contingent PSUs
—

 
1,070

Diluted weighted-average common shares outstanding
67,463

 
68,126

Basic net income (loss) per common share
$
(0.79
)
 
$
0.98

Diluted net income (loss) per common share
$
(0.79
)
 
$
0.96