Condensed Consolidated Statements of Changes in Retained Earnings, Accumulated Other Comprehensive Loss and Noncontrolling Interests - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 67,090	$ 47,693	$ (83,083)	$ 83,235
Pension and post-retirement plan adjustments, net of tax	115	2,330	554	4,594
Preferred dividends	(10)	(10)	(20)	(20)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	990,129	1,068,464	1,158,347	1,050,214
Net income	67,090	47,693	(83,083)	83,235
Common dividends	(18,459)	(18,099)	(36,494)	(35,381)
Preferred dividends	(10)	(10)	(20)	(20)
Ending balance	1,038,750	1,098,048	1,038,750	1,098,048
Accumulated Other Comprehensive (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(147,082)	(140,993)	(158,717)	(149,140)
Foreign currency translation adjustments	5,039	(31,606)	16,233	(25,714)
Pension and post-retirement plan adjustments, net of tax	115	2,330	554	4,594
Unrealized net gains (losses) on available-for-sale securities		(9)	2	(18)
Ending balance	$ (141,928)	$ (170,278)	$ (141,928)	$ (170,278)