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	67,877				67,877
Pension and postretirement benefits (net of tax effect)	(103)					(103)
Foreign currency translation	(1,313)					(1,313)
Cash dividends	(21,110)				(21,110)
Stock options exercised	967			824			143
Stock-based compensation	3,963			3,963
Issuance of treasury stock	3			(107)			110
Balance at end of period at Sep. 30, 2023	492,706	37,221		57,962	441,922	(7,399)	(37,000)
Balance at beginning of period at Jun. 30, 2023	475,592	37,221		55,833	423,877	(4,203)	(37,136)
Net earnings	25,969				25,969
Pension and postretirement benefits (net of tax effect)	(38)					(38)
Foreign currency translation	(3,158)					(3,158)
Cash dividends	(7,924)				(7,924)
Stock options exercised	909			774			135
Stock-based compensation	1,356			1,356
Issuance of treasury stock				(1)			1
Balance at end of period at Sep. 30, 2023	492,706	37,221		57,962	441,922	(7,399)	(37,000)
Balance at beginning of period at Dec. 31, 2023	516,482	37,221		59,185	458,719	(1,646)	(36,997)
Net earnings	94,225				94,225
Pension and postretirement benefits (net of tax effect)	(96)					(96)
Foreign currency translation	1,092					1,092
Cash dividends	(25,864)				(25,864)
Stock options exercised	751			646			105
Stock-based compensation	4,595			4,595
Issuance of treasury stock				(192)			192
Balance at end of period at Sep. 30, 2024	591,185	37,221		64,234	527,080	(650)	(36,700)
Balance at beginning of period at Jun. 30, 2024	563,138	37,221		62,915	505,040	(5,343)	(36,695)
Net earnings	32,038				32,038
Pension and postretirement benefits (net of tax effect)	(33)					(33)
Foreign currency translation	4,726					4,726
Cash dividends	(9,998)				(9,998)
Stock-based compensation	1,314			1,314
Issuance of treasury stock				5			(5)
Balance at end of period at Sep. 30, 2024	$ 591,185	$ 37,221		$ 64,234	$ 527,080	$ (650)	$ (36,700)

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