Consolidated Statements of Changes in Retained Earnings, Accumulated Other Comprehensive Loss and Noncontrolling Interests - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		$ 834,388			$ 834,388
Net income	$ 51,489	35,542	$ (61,476)	$ 36,450	179,630	$ 21,340	$ 124,077
Pension and post-retirement plan adjustments, net of tax					6,961	58,256	9,296
Unrecognized net losses on available-for-sale securities (Note 19)							(7)
(Income) loss attributable to noncontrolling interests					0	(448)	(1,061)
Preferred stock dividends					(41)	(41)	(41)
Balance at end of period	923,741		834,388		923,741	834,388
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		1,050,214		1,103,092	1,050,214	1,103,092	1,045,593
Net income					179,630	21,788	125,138
(Income) loss attributable to noncontrolling interests						(448)	(1,061)
Common dividends					(71,456)	(68,545)	(66,537)
Preferred stock dividends					(41)	(41)	(41)
Distributions to noncontrolling interests (Note 14)						(5,632)
Balance at end of period	1,158,347		1,050,214		1,158,347	1,050,214	1,103,092
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		(149,140)		(182,397)	(149,140)	(182,397)	(214,003)
Foreign currency translation adjustments					(19,453)	(25,354)	22,260
Pension and post-retirement plan adjustments, net of tax					6,961	58,256	9,296
Unrecognized net losses on available-for-sale securities (Note 19)					3	(4)
Reclassification of currency translation from accumulated other comprehensive loss into net income (Note 6)					2,912	267	216
(Income) loss attributable to noncontrolling interests						92	(159)
Balance at end of period	(158,717)		(149,140)		(158,717)	(149,140)	(182,397)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		$ 0		$ 7,993	0	7,993	6,773
(Income) loss attributable to noncontrolling interests						356	1,220
Share repurchase program						(8,349)
Balance at end of period	$ 0		$ 0		$ 0	$ 0	$ 7,993