Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net sales	$ 505,198	$ 425,544	$ 424,625
Cost of sales	299,714	257,295	261,097
Gross margin	205,484	168,249	163,528
Selling, engineering and administration	126,761	103,093	101,380
Operating earnings	78,723	65,156	62,148
Interest (income) expense, net	(20)	30	253
Other pension and postretirement costs	120	145	288
Earnings before income taxes	78,623	64,981	61,607
Provision for income taxes	17,739	15,638	14,430
Net earnings	$ 60,884	$ 49,343	$ 47,177
Earnings per share:
Basic	$ 2.09	$ 1.70	$ 1.63
Diluted	$ 2.08	$ 1.69	$ 1.61
Shares used in computation of earnings per share:
Basic	29,144	29,052	29,028
Impact of dilutive securities	194	178	192
Diluted	29,338	29,230	29,220