Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 18,015	$ 13,143	$ 47,011	$ 44,029
Other comprehensive income (loss):
Foreign currency translation adjustments	(4,546)	1,670	(1,947)	(2,426)
Total other comprehensive income (loss)	(4,546)	1,670	(1,947)	(2,426)
Comprehensive income	$ 13,469	$ 14,813	$ 45,064	$ 41,603