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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2015
Dec. 31, 2013
Dec. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]        
Net income (loss) $ (11,783)us-gaap_NetIncomeLoss $ (218,772)us-gaap_NetIncomeLoss $ 84,009us-gaap_NetIncomeLoss $ 86,452us-gaap_NetIncomeLoss
Other comprehensive income (loss), before tax:        
Currency translation adjustments (571)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax (4,872)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax (1,078)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax 1,386us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Transfer of temporary gain on long-term investments          (241)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Total other comprehensive income (loss), before tax (571)us-gaap_OtherComprehensiveIncomeLossBeforeTax (4,872)us-gaap_OtherComprehensiveIncomeLossBeforeTax (1,078)us-gaap_OtherComprehensiveIncomeLossBeforeTax 1,145us-gaap_OtherComprehensiveIncomeLossBeforeTax
Transfer of tax expense allocated to temporary gain on long-term investments          151us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Other comprehensive income (loss), net of tax (571)us-gaap_OtherComprehensiveIncomeLossNetOfTax (4,872)us-gaap_OtherComprehensiveIncomeLossNetOfTax (1,078)us-gaap_OtherComprehensiveIncomeLossNetOfTax 1,296us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income (loss) $ (12,354)us-gaap_ComprehensiveIncomeNetOfTax $ (223,644)us-gaap_ComprehensiveIncomeNetOfTax $ 82,931us-gaap_ComprehensiveIncomeNetOfTax $ 87,748us-gaap_ComprehensiveIncomeNetOfTax