Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 7,746	$ 9,264	$ 14,174	$ 30,589
Other comprehensive (loss) income:
Unrealized (loss) gain on available for sale securities	(5)	55	(10)	32
Foreign currency translation adjustment	(1,234)	453	(2,147)	(181)
Other comprehensive (loss) income	(1,239)	508	(2,157)	(149)
Comprehensive income	$ 6,507	$ 9,772	$ 12,017	$ 30,440