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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Consolidated Statement of Comprehensive Income [Abstract]    
Net income $ (11,135)us-gaap_NetIncomeLoss $ 36,672us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax   64us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Change in cumulative translation adjustment (14,679)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 1,327us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Comprehensive income $ (25,814)us-gaap_ComprehensiveIncomeNetOfTax $ 38,063us-gaap_ComprehensiveIncomeNetOfTax