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	27,753				27,753
Pension and postretirement benefits (net of tax effect)	5					5
Foreign currency translation	2,093					2,093
Cash dividends	(10,499)				(10,499)
Stock options exercised	352			281			71
Stock-based compensation	947			947
Purchase of common stock for treasury stock	(460)						(460)
Issuance of treasury stock	397			308			89
Balance at end of period at Jun. 30, 2021	381,847	37,221		46,500	332,104	3,411	(37,389)
Balance at beginning of period at Mar. 31, 2021	369,849	37,221		45,599	323,383	602	(36,956)
Net earnings	13,972				13,972
Pension and postretirement benefits (net of tax effect)	3					3
Foreign currency translation	2,806					2,806
Cash dividends	(5,251)				(5,251)
Stock-based compensation	573			573
Purchase of common stock for treasury stock	(460)						(460)
Issuance of treasury stock	355			328			27
Balance at end of period at Jun. 30, 2021	381,847	37,221		46,500	332,104	3,411	(37,389)
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)

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