Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 1,382,677	$ 1,270,528	$ 1,203,056
Other comprehensive income before reclassifications to consolidated statements of income	(43,154)	75,547
Amounts reclassified from accumulated other comprehensive (loss) income to the consolidated statements of income	13,631	12,633
Total other comprehensive (loss) income, net of tax	(29,523)	88,180	(19,995)
Balance	1,428,766	1,382,677	1,270,528
Gains and Losses on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(757)	(115)
Other comprehensive income before reclassifications to consolidated statements of income	73	(1,674)
Amounts reclassified from accumulated other comprehensive (loss) income to the consolidated statements of income	844	1,032
Total other comprehensive (loss) income, net of tax	917	(642)
Balance	160	(757)	(115)
Pension and Other Postretirement Benefit Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(142,119)	(144,047)
Other comprehensive income before reclassifications to consolidated statements of income	17,025	(9,673)
Amounts reclassified from accumulated other comprehensive (loss) income to the consolidated statements of income	12,787	11,601
Total other comprehensive (loss) income, net of tax	29,812	1,928
Balance	(112,307)	(142,119)	(144,047)
Foreign Currency Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	20,561	(66,333)
Other comprehensive income before reclassifications to consolidated statements of income	(60,252)	86,894
Amounts reclassified from accumulated other comprehensive (loss) income to the consolidated statements of income	0	0
Total other comprehensive (loss) income, net of tax	(60,252)	86,894
Balance	(39,691)	20,561	(66,333)
Accumulated Other Non-Owner Changes to Equity
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(122,315)	(210,495)	(190,500)
Balance	$ (151,838)	$ (122,315)	$ (210,495)