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Defined Benefit Pension Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Oct. 02, 2015
Sep. 30, 2016
Oct. 02, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 155 $ 108 $ 466 $ 322
Interest cost 19 19 54 57
Expected return on plan assets (24) (22) (69) (64)
Net amortization of transitional obligation [1] 3 3 10 8
Actuarial loss recognized in current period [1] 24 11 70 36
Total $ 177 $ 119 $ 531 $ 359
[1] Amounts reclassified from accumulated other comprehensive loss.