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, 2021	$ 403,070	$ 37,221		$ 49,224	$ 353,535	$ 136	$ (37,046)
Net earnings	31,024				31,024
Foreign currency translation	(7,680)					(7,680)
Cash dividends	(11,703)				(11,703)
Stock-based compensation	1,466			1,466
Purchase of common stock for treasury stock	(427)						(427)
Issuance of treasury stock	433			325			108
Balance at end of period at Jun. 30, 2022	416,183	37,221		51,015	372,856	(7,544)	(37,365)
Balance at beginning of period at Mar. 31, 2022	409,881	37,221		49,758	362,046	(2,179)	(36,965)
Net earnings	16,664				16,664
Foreign currency translation	(5,365)					(5,365)
Cash dividends	(5,854)				(5,854)
Stock-based compensation	851			851
Purchase of common stock for treasury stock	(427)						(427)
Issuance of treasury stock	433			406			27
Balance at end of period at Jun. 30, 2022	416,183	37,221		51,015	372,856	(7,544)	(37,365)
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)

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