Computation of Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 02, 2021	Apr. 03, 2020
Numerators:
Consolidated net income	$ 11,310	$ 11,947
Denominators:
Weighted average common shares outstanding—basic	35,279	35,152
Dilutive potential common shares	510	409
Weighted average common shares outstanding— diluted	35,789	35,561
Antidilutive potential common shares excluded from above	27	52
Earnings per Common Share:
Basic	$ 0.32	$ 0.34
Diluted	$ 0.32	$ 0.34