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Earnings per Share (Tables)
 9 Months Ended
Sep. 30, 2012
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,
 
2012
 
2011
 
2012
 
2011
 
(in thousands, except per share amounts)
Net income (loss)
$
(38,336
)
 
$
230,097

 
$
12,889

 
$
336,127

Basic weighted-average common shares outstanding
65,745

 
63,904

 
64,815

 
63,665

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

 
2,062

 
1,870

 
2,589

Add: dilutive effect of 3.50% Senior Convertible Notes
—

 
1,420

 
658

 
1,136

Diluted weighted-average common shares outstanding
65,745

 
67,386

 
67,343

 
67,390

Basic net income (loss) per common share
$
(0.58
)
 
$
3.60

 
$
0.20

 
$
5.28

Diluted net income (loss) per common share
$
(0.58
)
 
$
3.41

 
$
0.19

 
$
4.99