Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ (5,400)	$ 48,400
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(25,100)	(3,700)
Unrealized gain (loss) on derivative instruments	(10,300)	(2,500)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	100	(600)
Comprehensive income	(40,700)	41,600
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ (40,700)	$ 41,600