Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 323,960	$ 335,257	$ 172,492
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	323,884	335,257	172,492
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(2,792)	(18,062)	41,691
Unrealized (loss) gain on derivative instruments	(6,537)	457	(330)
Retirement plan and other activity	250	261	(3,153)
Comprehensive income	314,881	317,913	210,700
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	314,805	317,913	210,700
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	$ 76	$ 0	$ 0