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Comprehensive Income (Loss) (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Comprehensive Income (Loss).        
Net income (loss) $ (10,585) $ (12,490) $ (14,815) $ 138,409
Other comprehensive income (loss):        
Unrealized gain (loss), net, on marketable securities, net of tax 34 64 33 (261)
Total comprehensive income (loss) $ (10,551) $ (12,426) $ (14,782) $ 138,148