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Earnings per Share (Tables)
 9 Months Ended
Sep. 30, 2013
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,
 
2013
 
2012
 
2013
 
2012
 
(in thousands, except per share amounts)
Net income (loss)
$
70,690

 
$
(38,336
)
 
$
163,939

 
$
12,889

Basic weighted-average common shares outstanding
66,943

 
65,745

 
66,486

 
64,815

Add: dilutive effect of stock options, unvested RSUs, and contingent PSUs
1,310

 
—

 
1,483

 
1,870

Add: dilutive effect of 3.50% Senior Convertible Notes
—

 
—

 
—

 
658

Diluted weighted-average common shares outstanding
68,253

 
65,745

 
67,969

 
67,343

Basic net income (loss) per common share
$
1.06

 
$
(0.58
)
 
$
2.47

 
$
0.20

Diluted net income (loss) per common share
$
1.04

 
$
(0.58
)
 
$
2.41

 
$
0.19