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Accumulated Other Comprehensive Income or Loss (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income [Abstract]      
Net unrealized appreciation on available-for-sale investments $ 4,773,000us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ 6,866,000us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax  
Foreign currency translation (56,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax (6,634,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax  
Accumulated other comprehensive income 4,717,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 232,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (2,014,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Deferred Tax Liabilities, Other Comprehensive Income 2,600,000us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome 3,700,000us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome  
Deferred Tax Assets, Other Comprehensive Loss 93,000us-gaap_DeferredTaxAssetsOtherComprehensiveLoss 3,400,000us-gaap_DeferredTaxAssetsOtherComprehensiveLoss  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance - January 1 232,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (2,014,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (959,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Unrealized gain on marketable securities, net of tax 927,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax 3,175,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax 890,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax
Unrealized gain reclassified and recognized in net loss, net of tax (3,020,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1] (764,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1] (1,116,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1]
Foreign exchange reclassified and recognized in net loss, net of tax 6,567,000us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [2]    [2]    [2]
Total reclassified and recognized in net loss, net of tax 3,547,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax (764,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax (1,116,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Accumulated currency, net of tax 11,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax (165,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax (829,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Net change in other comprehensive income (loss), net of tax 4,485,000us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 2,246,000us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (1,055,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Accumulated other comprehensive income (loss) 4,717,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 232,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (2,014,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax 3,100,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax $ 9,300,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax    
[1] Amounts reclassified from unrealized gain or loss on marketable securities are included in other income in the consolidated statement of operations and comprehensive income or loss.
[2] Amounts reclassified from unrealized gain or loss on foreign exchange are included in other income in the consolidated statement of operations and comprehensive income or loss