Changes in Accumulated Other Comprehensive Income (Loss) by Component - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance at beginning of period			$ (122,315)	$ (210,495)
Other comprehensive (loss) income before reclassifications			(52,170)	15,736
Amounts reclassified from accumulated other comprehensive income to the consolidated statements of income			10,178	9,258
Total other comprehensive (loss) income, net of tax	$ (21,681)	$ 42,139	(41,992)	24,994
Balance at end of period	(164,307)	(185,501)	(164,307)	(185,501)
Gains and Losses on Cash Flow Hedges
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance at beginning of period			(757)	(115)
Other comprehensive (loss) income before reclassifications			(1,115)	(2,305)
Amounts reclassified from accumulated other comprehensive income to the consolidated statements of income			627	858
Total other comprehensive (loss) income, net of tax			(488)	(1,447)
Balance at end of period	(1,245)	(1,562)	(1,245)	(1,562)
Pension and Other Postretirement Benefit Items
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance at beginning of period			(142,119)	(144,047)
Other comprehensive (loss) income before reclassifications			614	(5,733)
Amounts reclassified from accumulated other comprehensive income to the consolidated statements of income			9,551	8,400
Total other comprehensive (loss) income, net of tax			10,165	2,667
Balance at end of period	(131,954)	(141,380)	(131,954)	(141,380)
Foreign Currency Items
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance at beginning of period			20,561	(66,333)
Other comprehensive (loss) income before reclassifications			(51,669)	23,774
Amounts reclassified from accumulated other comprehensive income to the consolidated statements of income			0	0
Total other comprehensive (loss) income, net of tax			(51,669)	23,774
Balance at end of period	$ (31,108)	$ (42,559)	$ (31,108)	$ (42,559)