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Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]      
Net (loss) income $ (137,125)us-gaap_NetIncomeLoss $ (83,352)us-gaap_NetIncomeLoss $ 11,366us-gaap_NetIncomeLoss
Other comprehensive income (loss):      
Unrealized gain (loss) on available-for-sale securities, net of tax (294)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 22us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 34us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Total comprehensive income (loss) $ (137,419)us-gaap_ComprehensiveIncomeNetOfTax $ (83,330)us-gaap_ComprehensiveIncomeNetOfTax $ 11,400us-gaap_ComprehensiveIncomeNetOfTax