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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net income $ 23,969,000 $ 15,876,000 $ 18,541,000
Other comprehensive income, net of tax      
Change in fair value of marketable securities, net of tax 257,000 269,000 143,000
Adjustment for net (gains)/losses realized and included in net income, net of tax (107,000) (112,000) 13,000
Total change in unrealized gains/losses on marketable securities, net of tax 150,000 157,000 156,000
Other comprehensive income 150,000 157,000 156,000
Comprehensive income $ 24,119,000 $ 16,033,000 $ 18,697,000