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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Net income $ 5,673,000 $ 7,208,000 $ 18,679,000 $ 14,011,000
Other comprehensive income, net of tax        
Change in fair value of marketable securities, net of tax 304,000 165,000 (4,000) 292,000
Adjustment for net (gains)/losses realized and included in net income, net of tax (32,000) (1,000) (217,000) (91,000)
Total change in unrealized gains/losses on marketable securities, net of tax 272,000 164,000 (221,000) 201,000
Other comprehensive income 272,000 164,000 (221,000) 201,000
Comprehensive income $ 5,945,000 $ 7,372,000 $ 18,458,000 $ 14,212,000