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Defined Benefit Pension Plans - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 27, 2019
Sep. 28, 2018
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]        
Service cost [1] $ 240 $ 137 $ 720 $ 414
Interest cost [2] 20 15 60 44
Expected return on plan assets [2] (36) (28) (103) (82)
Net amortization of transitional obligation [2],[3]   3   8
Prior service credit [2],[3] (6) (6) (17) (17)
Actuarial loss recognized in current period [2],[3] 32 28 97 85
Net periodic pension cost $ 250 $ 149 $ 757 $ 452
[1] Recognized in selling general and administrative expenses on the Condensed Consolidated Statements of Income.
[2] Recognized in other income (expense), net on the Condensed Consolidated Statements of Income.
[3] Amounts reclassified from accumulated other comprehensive income (loss).