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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 5,933,000	$ 3,990,000
Other comprehensive income, net of tax
Change in fair value of marketable securities, net of tax	104,000	185,000
Adjustment for net (gains)/losses realized and included in net income, net of tax	(63,000)	(47,000)
Total change in unrealized gains/losses on marketable securities, net of tax	41,000	138,000
Other comprehensive income	41,000	138,000
Comprehensive income	$ 5,974,000	$ 4,128,000

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