Condensed Consolidated Statements of Comprehensive Income (Unaudited) (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 Comprehensive Income [Abstract]
Net income	$ 13,579	$ 13,542	$ 28,996	$ 30,886
Other comprehensive income (loss):
Foreign currency translation adjustments	1,471	(3,578)	2,599	(4,096)
Total other comprehensive income (loss)	1,471	(3,578)	2,599	(4,096)
Comprehensive income	$ 15,050	$ 9,964	$ 31,595	$ 26,790