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Earnings per Share (Tables)
 6 Months Ended
Jun. 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 June 30,
 
For the Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
 
(in thousands, except per share amounts)
Net income (loss)
$
(57,508
)
 
$
59,780

 
$
(110,566
)
 
$
125,387

Basic weighted-average common shares outstanding
67,483

 
67,069

 
67,473

 
67,063

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

 
1,170

 
—

 
1,117

Diluted weighted-average common shares outstanding
67,483

 
68,239

 
67,473

 
68,180

Basic net income (loss) per common share
$
(0.85
)
 
$
0.89

 
$
(1.64
)
 
$
1.87

Diluted net income (loss) per common share
$
(0.85
)
 
$
0.88

 
$
(1.64
)
 
$
1.84