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Comprehensive Income (Loss) (Details) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Comprehensive Income (Loss).    
Net income (loss)$ 478$ (20,576)$ (14,337)$ 117,833
Other comprehensive loss:    
Unrealized loss, net, on marketable securities, net of tax(79)(117)(46)(378)
Total comprehensive income (loss)$ 399$ (20,693)$ (14,383)$ 117,455