Computation of Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 03, 2020	[1]	Mar. 29, 2019	[2]
Numerators:
Consolidated net income	$ 11,947		$ 12,253
Denominators:
Weighted average common shares outstanding—basic	35,152		34,958
Dilutive potential common shares	409		516
Weighted average common shares outstanding— diluted	35,561		35,474
Antidilutive potential common shares excluded from above	52		58
Earnings per Common Share:
Basic	$ 0.34		$ 0.35
Diluted	$ 0.34		$ 0.35

[1] 71,166 non-GAAP EPS performance-based restricted stock units granted to certain members of the executive management team and 213,219 shares of restricted stock issued to the former Laser Quantum non-controlling interest shareholders are considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of April 3, 2020.

[2] 45,252 non-GAAP EPS performance-based restricted stock units granted to certain members of the executive management team and 213,219 shares of restricted stock issued to the former Laser Quantum non-controlling interest shareholders were considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of March 29, 2019.