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Retirement Plans (Tables)
3 Months Ended
Apr. 01, 2017
Retirement Plans [Abstract]  
Defined Benefit Plan, Net Periodic Benefit Cost

The summary of the components of net periodic pension costs for the plans for the three months ended April 1, 2017 and April 2, 2016 is as follows (in thousands):

    Three Months Ended
    April 1, 2017 April 2, 2016
    U.S. U.S. Retiree Non-U.S. U.S. U.S. Retiree Non-U.S.
    Pension Healthcare Pension Pension Healthcare Pension
    Plans Plan Plans Plans Plan Plans
Service cost $ 101 $ 103 $ 1,251 $ 94 $ 116 $ 1,218
Interest cost   1,719   150   358   1,745   135   421
Expected return on plan                  
 assets   (2,663)   (147)   (402)   (2,417)   (130)   (399)
Net amortization:                  
 Prior service credit   -   -   (46)   -   -   (45)
 Net actuarial loss   651   -   231   667   -   188
Net periodic pension                  
 (benefit) cost $ (192) $ 106 $ 1,392 $ 89 $ 121 $ 1,383