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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net income $ 13,181,000us-gaap_NetIncomeLoss $ 23,969,000us-gaap_NetIncomeLoss $ 15,876,000us-gaap_NetIncomeLoss
Other comprehensive income, net of tax      
Change in fair value of marketable securities, net of tax 207,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 257,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 269,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Adjustment for net (gains)/losses realized and included in net income, net of tax (475,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (107,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (112,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Total change in unrealized (gains)/losses on marketable securities, net of tax (268,000)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 150,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 157,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Other comprehensive income (loss) (268,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax 150,000us-gaap_OtherComprehensiveIncomeLossNetOfTax 157,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income $ 12,913,000us-gaap_ComprehensiveIncomeNetOfTax $ 24,119,000us-gaap_ComprehensiveIncomeNetOfTax $ 16,033,000us-gaap_ComprehensiveIncomeNetOfTax