CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income	$ 4,855,000	$ 5,673,000	$ 16,542,000	$ 18,679,000
Other comprehensive income, net of tax
Change in fair value of marketable securities, net of tax	(146,000)	304,000	171,000	(4,000)
Adjustment for net (gains)/losses realized and included in net income, net of tax	(459,000)	(32,000)	(592,000)	(217,000)
Total change in unrealized gains/losses on marketable securities, net of tax	(605,000)	272,000	(421,000)	(221,000)
Other comprehensive income	(605,000)	272,000	(421,000)	(221,000)
Comprehensive income	$ 4,250,000	$ 5,945,000	$ 16,121,000	$ 18,458,000