Condensed Consolidated Statements of Changes in Retained Earnings, Accumulated Other Comprehensive Loss and Noncontrolling Interests - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 65,256	$ 44,906	$ (17,827)	$ 128,141
Pension and post-retirement plan adjustments, net of tax	188	2,299	742	6,893
Reclassification from accumulated other comprehensive (loss) into net income	101	2,912	101	2,912
Preferred dividends	(10)	(10)	(30)	(30)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,038,750	1,098,048	1,158,347	1,050,214
Net income	65,256	44,906	(17,827)	128,141
Common dividends	(18,475)	(18,036)	(54,969)	(53,417)
Preferred dividends	(10)	(10)	(30)	(30)
Ending balance	1,085,521	1,124,908	1,085,521	1,124,908
Accumulated Other Comprehensive (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(141,928)	(170,278)	(158,717)	(149,140)
Foreign currency translation adjustments	(18,771)	(32,361)	(2,538)	(58,075)
Pension and post-retirement plan adjustments, net of tax	188	2,299	742	6,893
Unrealized net gains (losses) on available-for-sale securities		13	2	(5)
Reclassification from accumulated other comprehensive (loss) into net income	101	2,912	101	2,912
Ending balance	$ (160,410)	$ (197,415)	$ (160,410)	$ (197,415)