Condensed Consolidated Statements of Comprehensive Income - 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	$ 106,292	$ 112,851	$ 274,049	$ 248,623
Other comprehensive income (loss), net of tax:
Changes in net prior service credit and actuarial losses	2,156	1,807	5,910	4,555
Change in fair value of derivatives	1,071	681	2,540	(1,670)
Foreign currency translation	(30,952)	22,520	(38,655)	(15,495)
Other comprehensive (loss) income	(27,725)	25,008	(30,205)	(12,610)
Comprehensive income	$ 78,567	$ 137,859	$ 243,844	$ 236,013