Computation of Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Oct. 01, 2021	Sep. 30, 2022	Oct. 01, 2021
Numerators:
Consolidated net income	$ 22,490	$ 13,603	$ 58,789	$ 36,577
Denominators:
Weighted average common shares outstanding—basic	35,729	35,447	35,625	35,366
Dilutive potential common shares	199	317	256	405
Weighted average common shares outstanding— diluted	35,928	35,764	35,881	35,771
Antidilutive potential common shares excluded from above	73	1	104	18
Earnings per common share (Note 5):
Basic	$ 0.63	$ 0.38	$ 1.65	$ 1.03
Diluted	$ 0.63	$ 0.38	$ 1.64	$ 1.02