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Comprehensive Loss (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Net loss $ (58,442) $ (19,288) $ (144,882) $ (84,735)
Other comprehensive loss:        
Net unrealized holding gains (losses) on investments, net of tax 0 (1,452) 9 (1,707)
Comprehensive loss $ (58,442) $ (20,740) $ (144,873) $ (86,442)