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Retirement Plans (Tables)
3 Months Ended
Apr. 02, 2016
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 2, 2016 and April 4, 2015 is as follows (in thousands):

    Three Months Ended
    April 2, 2016 April 4, 2015
    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 $ 94 $ 116 $ 1,218 $ - $ 262 $ 1,337
Interest cost   1,745   135   421   1,513   118   402
Expected return on plan                  
 assets   (2,417)   (130)   (399)   (2,318)   (122)   (410)
Net amortization:                  
 Prior service (credit) cost   -   -   (45)   -   -   14
 Net actuarial loss   667   -   188   679   -   273
Net periodic pension                  
 cost (benefit) $ 89 $ 121 $ 1,383 $ (126) $ 258 $ 1,616