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Accumulated Other Comprehensive Income or Loss (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Accumulated Other Comprehensive Income [Abstract]      
Net unrealized appreciation on available-for-sale investments $ 4,722,000us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax   $ 4,773,000us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Foreign currency translation (47,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax   (56,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Accumulated other comprehensive income 4,675,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 759,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Deferred income tax liability 2,500,000us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome   2,600,000us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
Deferred income tax asset 25,000us-gaap_DeferredTaxAssetsOtherComprehensiveLoss   93,000us-gaap_DeferredTaxAssetsOtherComprehensiveLoss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance, January 1 4,717,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 232,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Unrealized gain on marketable securities, net of tax 263,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax 474,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax  
Unrealized gain reclassified and recognized in net loss, net of tax (314,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1] 13,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1]  
Foreign exchange reclassified and recognized in net loss, net of tax 262,000us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [2]     
Total reclassified and recognized in net loss, net of tax (52,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax 13,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax  
Change in accumulated foreign currency translation, net of tax (253,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax 40,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax  
Total other comprehensive income (loss), net of tax (42,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 527,000us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent  
Accumulated other comprehensive income $ 4,675,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 759,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
[1] Amounts reclassified from unrealized gain or loss on marketable securities are included in other income in the condensed 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.