Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 24,942	$ 24,523	$ 39,946	$ 43,246
Other comprehensive income, before tax and net of reclassification adjustments:
Foreign currency translation adjustment	4,467	581	(10,484)	(558)
Unrealized (loss) gain on securities available-for-sale	283	(100)	789	92
Unrealized (loss) gain on derivative instruments	(7,718)	(87)	(6,736)	(1,960)
Other comprehensive (loss) gain, before tax	(2,968)	394	(16,431)	(2,426)
Tax expense related to items of other comprehensive income	(1,387)	133	(4,302)	(640)
Other comprehensive loss, net of tax	(1,581)	261	(12,129)	(1,786)
Comprehensive income	$ 23,361	$ 24,784	$ 27,817	$ 41,460