Consolidated Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Net sales	$ 216,658	$ 175,858	$ 412,938	$ 334,959
Cost of sales	131,290	106,424	250,392	202,709
Gross margin	85,368	69,434	162,546	132,250
Selling, engineering and administration	43,856	39,932	84,456	77,702
Operating earnings	41,512	29,502	78,090	54,548
Interest income, net	(1,862)	(827)	(3,389)	(1,449)
Other pension and postretirement costs	12	33	25	65
Earnings before income taxes	43,362	30,296	81,454	55,932
Provision for income taxes	10,306	7,803	19,267	14,024
Net earnings	$ 33,056	$ 22,493	$ 62,187	$ 41,908
Earnings per share:
Basic	$ 1.13	$ 0.77	$ 2.12	$ 1.43
Diluted	1.12	0.76	2.11	1.42
Dividends declared per common share	$ 0.27	$ 0.23	$ 0.54	$ 0.45
Shares used in computation of earnings per share:
Basic	29,361,034	29,272,693	29,341,407	29,264,166
Impact of dilutive securities	167,904	174,832	170,955	170,301
Diluted	29,528,938	29,447,525	29,512,362	29,434,467