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	13,781				13,781
Pension and postretirement benefits (net of $(1) tax effect)	3					3
Foreign currency translation	(714)					(714)
Cash dividends	(5,248)				(5,248)
Stock options exercised	352			281			71
Stock-based compensation	374			374
Issuance of treasury stock	42			(20)			62
Balance at end of period at Mar. 31, 2021	369,849	37,221		45,599	323,383	602	(36,956)
Balance at beginning of period at Dec. 31, 2021	403,070	37,221		49,224	353,535	136	(37,046)
Net earnings	14,360				14,360
Foreign currency translation	(2,315)					(2,315)
Cash dividends	(5,849)				(5,849)
Stock-based compensation	615			615
Issuance of treasury stock				(81)			81
Balance at end of period at Mar. 31, 2022	$ 409,881	$ 37,221		$ 49,758	$ 362,046	$ (2,179)	$ (36,965)

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