Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 88,145	$ 92,540	$ 136,541	$ 148,254
Other comprehensive income, net of tax:
Foreign currency translation adjustments	2,858	(24,881)	(804)	(13,903)
Unrealized gain (loss) on derivative instruments	(4,030)	580	(6,499)	5,109
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	62	45	(544)	130
Comprehensive income	87,153	68,284	128,794	139,590
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	118	0	100	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 87,035	$ 68,284	$ 128,694	$ 139,590