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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net income $ 4,444,000us-gaap_NetIncomeLoss $ 5,967,000us-gaap_NetIncomeLoss
Other comprehensive income, net of tax    
Change in fair value of marketable securities, net of tax 175,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 103,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Adjustment for net (gains)/losses realized and included in net income, net of tax (87,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (91,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Total change in unrealized (gains)/losses on marketable securities, net of tax 88,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 12,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Other comprehensive income 88,000us-gaap_OtherComprehensiveIncomeLossNetOfTax 12,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income $ 4,532,000us-gaap_ComprehensiveIncomeNetOfTax $ 5,979,000us-gaap_ComprehensiveIncomeNetOfTax