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Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
 
2012
 
2011
 
(in thousands, except per share amounts)
Net income (loss)
$
26,336

 
$
(18,503
)
Basic weighted-average common shares outstanding
64,104

 
63,447

Add: dilutive effect of stock options, unvested RSUs, and contingent PSUs
2,210

 
—

Add: dilutive effect of 3.50% Senior Convertible Notes
1,531

 
—

Diluted weighted-average common shares outstanding
67,845

 
63,447

Basic net income (loss) per common share
$
0.41

 
$
(0.29
)
Diluted net income (loss) per common share
$
0.39

 
$
(0.29
)