CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 461,466	$ 200,802	$ 152,530
Foreign currency:
Foreign currency translation continuing operations adjustments, net of tax of $(6,270), $(1,047) and $(29,448), respectively	4,195	(83,889)	173,074
Foreign currency translation, net of tax	4,195	(83,889)	173,074
Pension and other postretirement benefits plans:
Prior service cost recognized in net periodic cost, net of tax of $(20), $(23) and $(39), respectively	62	71	66
Unamortized (loss) gain arising during the period, net of tax of $3,817, $(447) and $1,677, respectively	(12,767)	1,116	(5,419)
Plan amendments, curtailments, and settlements, net of tax of $0, $(137) and $74, respectively	0	511	(223)
Net loss recognized in net periodic cost, net of tax of $(1,611), $(1,588) and $(2,457), respectively	5,319	5,231	4,447
Foreign currency translation, net of tax of $15, $(183) and $413, respectively	(44)	499	(1,083)
Pension and other postretirement benefits plans adjustment, net of tax	(7,430)	7,428	(2,212)
Derivatives qualifying as hedges:
Unrealized gain (loss) on derivatives arising during the period, net of tax $(85), $(268) and $(631), respectively	1,062	2,574	2,775
Reclassification adjustment on derivatives included in net income, net of tax of $150, $163 and $83, respectively	(1,134)	(2,107)	(11)
Derivatives qualifying as hedges, net of tax	(72)	467	2,764
Other comprehensive (loss) income, net of tax	(3,307)	(75,994)	173,626
Comprehensive income	$ 458,159	$ 124,808	$ 326,156