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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 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			(27,144)	(23,473)
Amounts reclassified from accumulated other comprehensive income to the consolidated statements of income			6,833	6,328
Total other comprehensive income (loss), net of tax	$ 24,591	$ 17,044	(20,311)	(17,145)
Balance at end of period	(142,626)	(227,640)	(142,626)	(227,640)
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			(1,003)	(2,255)
Amounts reclassified from accumulated other comprehensive income to the consolidated statements of income			453	729
Total other comprehensive income (loss), net of tax			(550)	(1,526)
Balance at end of period	(1,307)	(1,641)	(1,307)	(1,641)
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			145	(5,141)
Amounts reclassified from accumulated other comprehensive income to the consolidated statements of income			6,380	5,599
Total other comprehensive income (loss), net of tax			6,525	458
Balance at end of period	(135,594)	(143,589)	(135,594)	(143,589)
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			(26,286)	(16,077)
Amounts reclassified from accumulated other comprehensive income to the consolidated statements of income			0	0
Total other comprehensive income (loss), net of tax			(26,286)	(16,077)
Balance at end of period	$ (5,725)	$ (82,410)	$ (5,725)	$ (82,410)