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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net income $ 61,102us-gaap_NetIncomeLoss $ 126,172us-gaap_NetIncomeLoss $ 16,151us-gaap_NetIncomeLoss
Other comprehensive income (loss):      
Unrealized gain (loss) on available for sale securities, net of tax 316us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent (114,283)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent 114,319us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Cumulative translation adjustment, net of tax 416us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent 1,365us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent 0us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent
Comprehensive income $ 61,834us-gaap_ComprehensiveIncomeNetOfTax $ 13,254us-gaap_ComprehensiveIncomeNetOfTax $ 130,470us-gaap_ComprehensiveIncomeNetOfTax