CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands		3 Months Ended
		Apr. 03, 2020		Mar. 29, 2019
Statement Of Income And Comprehensive Income [Abstract]
Consolidated net income		$ 11,947	[1]	$ 12,253	[2]
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	[3]	(6,806)		2,339
Pension liability adjustments, net of tax	[4]	737		17
Total other comprehensive income (loss)		(6,069)		2,356
Total consolidated comprehensive income (loss)		$ 5,878		$ 14,609

[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.

[3] The tax effect on this component of comprehensive income was nominal for all periods presented.

[4] The tax effect on this component of comprehensive income was nominal for all periods presented. See Note 4 for the total amount of pension liability adjustments reclassified out of accumulated other comprehensive income (loss).