Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 1,398	$ 4,090	$ 1,750	$ 4,011
Unrealized loss on marketable securities, net of taxes of $0	(4)	(19)	(9)	(29)
Total comprehensive income	$ 1,394	$ 4,071	$ 1,741	$ 3,982