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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net income $ 20,058,000 $ 13,181,000 $ 23,969,000
Other comprehensive income, net of tax      
Change in foreign currency translation, net of tax 64,000 0 0
Change in fair value of marketable securities, net of tax (245,000) 207,000 257,000
Adjustment for net (gains)/losses realized and included in net income, net of tax (316,000) (475,000) (107,000)
Total change in unrealized (gains)/losses on marketable securities, net of tax (561,000) (268,000) 150,000
Other comprehensive income/(loss) (497,000) (268,000) 150,000
Comprehensive income $ 19,561,000 $ 12,913,000 $ 24,119,000