Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 114,800	$ 166,900	$ 407,500	$ (73,900)
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(12,900)	12,800	(21,400)	(1,800)
Unrealized gain (loss) on derivative instruments	2,500	1,800	5,700	(10,600)
Retirement plan and other activity	0	100	200	200
Comprehensive income (loss)	104,400	181,600	392,000	(86,100)
Comprehensive income attributable to noncontrolling interest	(200)	(100)	(400)	(100)
Comprehensive income (loss)	$ 104,200	$ 181,500	$ 391,600	$ (86,200)