CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 1,948	$ 1,941
Other comprehensive income, net of taxes:
Unrealized gain (loss) on marketable securities	8	(10)
Total other comprehensive income (loss)	8	(10)
Comprehensive income	$ 1,956	$ 1,931