Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 11,052	$ 14,205
Other comprehensive loss:
Foreign currency translation adjustments	1,348	(3,462)
Unrealized gain (loss) on investments, net of tax	(6)	5
Interest rate swap fair value adjustment, net of tax	(2,232)	0
Other	0	(4)
Other comprehensive loss	(890)	(3,461)
Comprehensive income	$ 10,162	$ 10,744