Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net income	$ 18,920	$ 32,076	$ 57,318	$ 87,066
Other comprehensive loss:
Foreign currency translation adjustments	(1,023)	(2,044)	(3,009)	(3,578)
Change in fair value of interest rate swap	388	(605)	(517)	(368)
Other comprehensive loss	(635)	(2,649)	(3,526)	(3,946)
Comprehensive income	$ 18,285	$ 29,427	$ 53,792	$ 83,120