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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Consolidated Statements of Comprehensive Income [Abstract]    
Net income $ 2,943us-gaap_NetIncomeLoss $ 224us-gaap_NetIncomeLoss
OTHER COMPREHENSIVE INCOME:    
Unrealized gain on short term investments, net of income tax expense of $12 and $3, respectively 22us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 5us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive income $ 2,965us-gaap_ComprehensiveIncomeNetOfTax $ 229us-gaap_ComprehensiveIncomeNetOfTax