CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2022	$ 21,661		$ 856,013	$ (19,939)	$ 857,735
Balance (in shares) at Dec. 31, 2022	216,609,000
Increase (Decrease) in Stockholders' Equity
Stock issued for stock incentive plans, net	$ 115	$ 1,687			1,802
Stock issued for stock incentive plans, net (in shares)	1,149,000
Stock purchased and retired	$ (139)	(1,687)	(9,523)		(11,349)
Stock purchased and retired (in shares)	(1,388,000)
Net income			71,524		71,524
Dividends			(8,679)		(8,679)
Pension adjustment, net of taxes				16,678	16,678
Foreign currency translation				(16)	(16)
Balance at Mar. 31, 2023	$ 21,637		909,335	(3,277)	927,695
Balance (in shares) at Mar. 31, 2023	216,370,000
Balance at Dec. 31, 2023	$ 21,502		1,003,380	(2,369)	$ 1,022,513
Balance (in shares) at Dec. 31, 2023	215,026,000				215,026,458
Increase (Decrease) in Stockholders' Equity
Stock issued for stock incentive plans, net	$ 65	1,861			$ 1,926
Stock issued for stock incentive plans, net (in shares)	652,000
Stock purchased and retired	$ (133)	$ (1,861)	(7,888)		(9,882)
Stock purchased and retired (in shares)	(1,331,000)
Net income			27,467		27,467
Dividends			(8,621)		(8,621)
Foreign currency translation				(113)	(113)
Balance at Mar. 31, 2024	$ 21,434		$ 1,014,338	$ (2,482)	$ 1,033,290
Balance (in shares) at Mar. 31, 2024	214,347,000				214,347,063