CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income	$ 6,248,000	$ 5,720,000	$ 10,692,000	$ 11,687,000
Other comprehensive income, net of tax
Change in fair value of marketable securities, net of tax	(162,000)	214,000	13,000	317,000
Adjustment for net (gains) realized and included in net income, net of tax	(14,000)	(42,000)	(101,000)	(133,000)
Total change in unrealized (gains)/losses on marketable securities, net of tax	(176,000)	172,000	(88,000)	184,000
Other comprehensive income	(176,000)	172,000	(88,000)	184,000
Comprehensive income	$ 6,072,000	$ 5,892,000	$ 10,604,000	$ 11,871,000