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, 2020	$ 361,259	$ 37,221		$ 44,964	$ 314,850	$ 1,313	$ (37,089)
Net earnings	43,608				43,608
Pension and postretirement benefits (net of tax effect)	9					9
Foreign currency translation	(155)					(155)
Cash dividends	(16,408)				(16,408)
Stock options exercised	2,037			1,623			414
Stock-based compensation	1,537			1,537
Purchase of common stock for treasury stock	(460)						(460)
Issuance of treasury stock	397			308			89
Balance at end of period at Sep. 30, 2021	391,824	37,221		48,432	342,050	1,167	(37,046)
Balance at beginning of period at Jun. 30, 2021	381,847	37,221		46,500	332,104	3,411	(37,389)
Net earnings	15,855				15,855
Pension and postretirement benefits (net of tax effect)	4					4
Foreign currency translation	(2,248)					(2,248)
Cash dividends	(5,909)				(5,909)
Stock options exercised	1,685			1,342			343
Stock-based compensation	590			590
Balance at end of period at Sep. 30, 2021	391,824	37,221		48,432	342,050	1,167	(37,046)
Balance at beginning of period at Dec. 31, 2021	403,070	37,221		49,224	353,535	136	(37,046)
Net earnings	48,957				48,957
Pension and postretirement benefits (net of tax effect)	(16)					(16)
Foreign currency translation	(13,104)					(13,104)
Cash dividends	(18,285)				(18,285)
Stock options exercised	61			50			11
Stock-based compensation	2,170			2,170
Purchase of common stock for treasury stock	(427)						(427)
Issuance of treasury stock	433			336			97
Balance at end of period at Sep. 30, 2022	422,859	37,221		51,780	384,207	(12,984)	(37,365)
Balance at beginning of period at Jun. 30, 2022	416,183	37,221		51,015	372,856	(7,544)	(37,365)
Net earnings	17,933				17,933
Pension and postretirement benefits (net of tax effect)	(16)					(16)
Foreign currency translation	(5,424)					(5,424)
Cash dividends	(6,582)				(6,582)
Stock options exercised	61			50			11
Stock-based compensation	704			704
Issuance of treasury stock				11			(11)
Balance at end of period at Sep. 30, 2022	$ 422,859	$ 37,221		$ 51,780	$ 384,207	$ (12,984)	$ (37,365)

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