Industry Segment and Geographic Data, Operating Income to Earnings (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of segment operating income to net earnings [Abstract]
Operating Income		$ 128,999	$ 108,895	$ 94,495
Other non-operating income, net		3,494	812	2,587
Interest expense		2,028	2,328	5,286
Earnings from continuing operations before income taxes		130,465	107,379	91,796
Provision for income taxes		31,044	26,962	22,745
Earnings from continuing operations		99,421	80,417	69,051
Discontinued operations, net of tax		(8,467)	(23,024)	(11,134)
Net earnings		90,954	57,393	57,917
Long-lived assets [Abstract]
Long-lived assets	[1]	450,630	313,234	326,025
United States [Member]
Long-lived assets [Abstract]
Long-lived assets	[1]	315,983	241,053	253,384
Asia [Member]
Long-lived assets [Abstract]
Long-lived assets	[1]	80,175	40,621	38,942
Europe [Member]
Long-lived assets [Abstract]
Long-lived assets	[1]	37,892	16,504	17,004
Mexico [Member]
Long-lived assets [Abstract]
Long-lived assets	[1]	12,119	10,586	12,036
Canada [Member]
Long-lived assets [Abstract]
Long-lived assets	[1]	$ 4,461	$ 4,470	$ 4,659

[1] Long-lived assets are attributed to countries based upon the location of the assets.