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Pension Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Apr. 01, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 127 $ 151
Interest cost 14 17
Expected return on plan assets (23) (22)
Net amortization of transitional obligation [1] 3 3
Actuarial loss recognized in current period [1] 17 24
Total $ 138 $ 173
[1] Amounts reclassified from accumulated other comprehensive loss.