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, 2024	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		$ 966,802			$ 966,802
Net income	$ 87,946	58,139	$ 76,410	$ (150,173)	284,967	$ 58,583	$ 179,630
Pension and post-retirement plan adjustments, net of tax					31,262	7,683	6,961
Unrecognized net gains on available-for-sale securities (Note 19)							3
Preferred stock dividends					(41)	(41)	(41)
Balance at end of period	1,143,319		966,802		1,143,319	966,802
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		1,143,442		1,158,347	1,143,442	1,158,347	1,050,214
Net income					284,967	58,583	179,630
Common dividends					(78,718)	(73,447)	(71,456)
Preferred stock dividends					(41)	(41)	(41)
Balance at end of period	1,349,650		1,143,442		1,349,650	1,143,442	1,158,347
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		$ (129,249)		$ (158,717)	(129,249)	(158,717)	(149,140)
Foreign currency translation adjustments					(42,462)	21,682	(19,453)
Pension and post-retirement plan adjustments, net of tax					31,262	7,683	6,961
Unrecognized net gains on available-for-sale securities (Note 19)						2
Reclassification of currency translation from accumulated other comprehensive loss into net income (Note 7)					(1,200)	101	2,912
Balance at end of period	$ (141,649)		$ (129,249)		$ (141,649)	$ (129,249)	$ (158,717)