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Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements of Comprehensive Income (Loss)      
Net (loss) income $ (46,284) $ 53,815 $ (38,463)
Other comprehensive (loss) income:      
Unrealized net (loss) gain on marketable securities (58) 1 (2)
Other comprehensive (loss) income (58) 1 (2)
Comprehensive (loss) income $ (46,342) $ 53,816 $ (38,465)