Consolidated Condensed Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock at $1 par value	[1]	Capital in excess of par value	Reinvested earnings	Accumulated other comprehensive income (loss)	Treasury stock (at cost)
Balance at beginning of period at Dec. 31, 2022	$ 442,422	$ 37,221		$ 53,282	$ 395,155	$ (5,983)	$ (37,253)
Net earnings	41,908				41,908
Pension and postretirement benefits (net of tax effect)	(65)					(65)
Foreign currency translation	1,845					1,845
Cash dividends	(13,186)				(13,186)
Stock options exercised	58			50			8
Stock-based compensation	2,607			2,607
Issuance of treasury stock	3			(106)			109
Balance at end of period at Jun. 30, 2023	475,592	37,221		55,833	423,877	(4,203)	(37,136)
Balance at beginning of period at Mar. 31, 2023	458,037	37,221		54,245	407,979	(4,258)	(37,150)
Net earnings	22,493				22,493
Pension and postretirement benefits (net of tax effect)	(33)					(33)
Foreign currency translation	88					88
Cash dividends	(6,595)				(6,595)
Stock-based compensation	1,601			1,601
Issuance of treasury stock	1			(13)			14
Balance at end of period at Jun. 30, 2023	475,592	37,221		55,833	423,877	(4,203)	(37,136)
Balance at beginning of period at Dec. 31, 2023	516,482	37,221		59,185	458,719	(1,646)	(36,997)
Net earnings	62,187				62,187
Pension and postretirement benefits (net of tax effect)	(64)					(64)
Foreign currency translation	(3,633)					(3,633)
Cash dividends	(15,866)				(15,866)
Stock options exercised	751			646			105
Stock-based compensation	3,281			3,281
Issuance of treasury stock				(197)			197
Balance at end of period at Jun. 30, 2024	563,138	37,221		62,915	505,040	(5,343)	(36,695)
Balance at beginning of period at Mar. 31, 2024	535,567	37,221		60,468	479,925	(5,268)	(36,779)
Net earnings	33,056				33,056
Pension and postretirement benefits (net of tax effect)	(31)					(31)
Foreign currency translation	(44)					(44)
Cash dividends	(7,941)				(7,941)
Stock options exercised	521			450			71
Stock-based compensation	2,010			2,010
Issuance of treasury stock				(13)			13
Balance at end of period at Jun. 30, 2024	$ 563,138	$ 37,221		$ 62,915	$ 505,040	$ (5,343)	$ (36,695)

[1] Each common share of stock equals $1 par value; therefore, the number of common shares is the same as the dollar value.