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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 03, 2020
Jun. 28, 2019
Jul. 03, 2020
Jun. 28, 2019
Statement Of Income And Comprehensive Income [Abstract]        
Net income (loss) $ (1,172) $ 3,914 $ (1,306) $ 5,281
Defined benefit plans:        
Net change in plan assets (28) (614) (53) (640)
Reclassification into other income, net 72 28 142 54
Foreign currency translation loss 113 382 86 339
Tax effect (40) (55) (36) (35)
Other comprehensive income (loss), net of tax 117 (259) 139 (282)
Comprehensive income (loss) $ (1,055) $ 3,655 $ (1,167) $ 4,999