Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 166,900	$ 88,400	$ (73,900)	$ 224,900
Other comprehensive income, net of tax:
Foreign currency translation adjustments	12,800	(12,400)	(1,800)	(13,200)
Unrealized gain (loss) on derivative instruments	1,800	(400)	(10,600)	(6,900)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	100	0	200	(500)
Comprehensive income (loss)	181,500	75,600	(86,200)	204,400
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	(100)	0	(100)	100
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 181,600	$ 75,600	$ (86,100)	$ 204,300