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Defined Benefit Pension Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 28, 2018
Sep. 29, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost [1] $ 137 $ 128 $ 414 $ 386
Interest cost [2] 15 14 44 42
Expected return on plan assets [2] (28) (24) (82) (71)
Net amortization of transitional obligation [2],[3] 3 3 8 9
Prior service credit [2],[3] (6) (2) (17) (6)
Actuarial loss recognized in current period [2],[3] 28 17 85 52
Net periodic pension cost $ 149 $ 136 $ 452 $ 412
[1] Recognized in selling general and administrative expenses on the Condensed Consolidated Statements of Operations.
[2] For 2018, recognized in other income (expense), net, and for 2017, recognized in selling, general and administrative on the Condensed Consolidated Statements of Operations.
[3] Amounts reclassified from accumulated other comprehensive loss.