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Earnings per Share (Tables)
 9 Months Ended
Sep. 30, 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 September 30,
 
For the Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
 
(in thousands, except per share amounts)
Net income (loss)
$
3,114

 
$
208,938

 
$
(107,452
)
 
$
334,325

Basic weighted-average common shares outstanding
67,961

 
67,379

 
67,638

 
67,169

Add: dilutive effect of stock options, unvested RSUs, and contingent PSUs
158

 
1,051

 
—

 
1,089

Diluted weighted-average common shares outstanding
68,119

 
68,430

 
67,638

 
68,258

Basic net income (loss) per common share
$
0.05

 
$
3.10

 
$
(1.59
)
 
$
4.98

Diluted net income (loss) per common share
$
0.05

 
$
3.05

 
$
(1.59
)
 
$
4.90