CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 359,081	$ 308,722	$ 193,814
Other comprehensive income (loss), net of tax:
Changes in net prior service credit and net actuarial losses, net of tax (provision) benefit of $(18,850), $11,007 and $(2,540), respectively	49,130	(29,502)	15,364
Change in fair value of derivatives, net of tax (provision) benefit of $(725), $461 and $683, respectively	2,329	(1,474)	(2,174)
Foreign currency translation, net of tax (provision) benefit of $(9,695), $15,692 and $(1,559), respectively	(50,334)	29,765	(4,124)
Other comprehensive income (loss)	1,125	(1,211)	9,066
Comprehensive income	$ 360,206	$ 307,511	$ 202,880