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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net income $ 5,967,000 $ 5,933,000
Other comprehensive income, net of tax    
Change in fair value of marketable securities, net of tax 103,000 104,000
Adjustment for net (gains)/losses realized and included in net income, net of tax (91,000) (63,000)
Total change in unrealized gains/losses on marketable securities, net of tax 12,000 41,000
Other comprehensive income 12,000 41,000
Comprehensive income $ 5,979,000 $ 5,974,000