Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance - January 1		$ (603,760)	$ (579,196)
Other comprehensive income (loss) before reclassifications		34,636	(33,981)
Amounts reclassified from AOCL		10,098	9,417
Other comprehensive income (loss)	$ 25,665	44,734	(24,564)	$ (9,766)
Balance - December 31	(603,760)	(559,026)	(603,760)	(579,196)
Net of tax		(10,098)	(9,417)
Foreign Currency Translation Items
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance - January 1		(456,549)	(441,364)
Other comprehensive income (loss) before reclassifications		524	(15,185)
Amounts reclassified from AOCL		0	0
Other comprehensive income (loss)		524	(15,185)
Balance - December 31	(456,549)	(456,025)	(456,549)	(441,364)
Net of tax		0	0
Pension and other post-retirement effects
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance - January 1		(146,723)	(137,161)
Other comprehensive income (loss) before reclassifications		34,960	(18,979)
Amounts reclassified from AOCL		10,098	9,417
Other comprehensive income (loss)		45,058	(9,562)
Balance - December 31	(146,723)	(101,665)	(146,723)	(137,161)
Amount of settlement of reclassification adjustment from accumulated other comprehensive income (loss)		(640)	(836)
Tax benefit		3,365	3,148
Net of tax		(10,098)	(9,417)
Cash flow hedging activity
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance - January 1		(488)	(671)
Other comprehensive income (loss) before reclassifications		(848)	183
Amounts reclassified from AOCL		0	0
Other comprehensive income (loss)		(848)	183
Balance - December 31	(488)	(1,336)	(488)	(671)
Net of tax		0	0
Noncontrolling Interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss)		(1,302)	769	579
Foreign currency translation adjustments, attributable to noncontrolling interest	$ 5,900	4,600	5,900	$ 5,100
Amortization of actuarial losses
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification from AOCI, before tax		(12,213)	(11,161)
Prior service costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification from AOCI, before tax		$ (610)	$ (568)