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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 income (loss) $ (57,111)us-gaap_NetIncomeLoss $ 41,029us-gaap_NetIncomeLoss $ (100,060)us-gaap_NetIncomeLoss
Net change in fair value of derivative financial instruments, net of benefit from income taxes of $161 in 2012 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (298)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Net change in fair value of marketable securities, net of benefit from income taxes of $8,487 and $2,380 in 2012 and 2013 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (4,418)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (15,760)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Other comprehensive loss 0us-gaap_OtherComprehensiveIncomeLossNetOfTax (4,418)us-gaap_OtherComprehensiveIncomeLossNetOfTax (16,058)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income (loss) $ (57,111)us-gaap_ComprehensiveIncomeNetOfTax $ 36,611us-gaap_ComprehensiveIncomeNetOfTax $ (116,118)us-gaap_ComprehensiveIncomeNetOfTax