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Defined Benefit Pension Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2018
Mar. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost [1] $ 138 $ 129
Interest cost [2] 14 14
Expected return on plan assets [2] (26) (23)
Net amortization of transitional obligation [2],[3] 3 3
Prior service credit [2],[3] (6) (2)
Actuarial loss recognized in current period [2],[3] 28 17
Net periodic pension cost $ 151 $ 138
[1] Recognized in selling general and administrative expenses on the Condensed Consolidated Statements of Operations.
[2] Recognized in other income, net on the Condensed Consolidated Statements of Operations.
[3] Amounts reclassified from accumulated other comprehensive loss.