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Retirement Plans (Tables)
6 Months Ended
Jul. 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 and six months ended July 2, 2016 and July 4, 2015 is as follows (in thousands):

    Three Months Ended
    July 2, 2016 July 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 $ 1,250 $ - $ 262 $ 1,337
Interest cost   1,745   135   429   1,513   118   402
Expected return on plan                  
 assets   (2,417)   (130)   (406)   (2,318)   (122)   (410)
Net amortization:                  
 Prior service (credit) cost   -   -   (49)   -   -   14
 Net actuarial loss   667   -   192   679   -   273
Net periodic pension                  
 cost (benefit) $ 89 $ 121 $ 1,416 $ (126) $ 258 $ 1,616

    Six Months Ended
    July 2, 2016 July 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 $ 188 $ 232 $ 2,468 $ - $ 524 $ 2,674
Interest cost   3,490   270   850   3,026   236   804
Expected return on plan                  
 assets   (4,834)   (260)   (805)   (4,636)   (244)   (820)
Net amortization:                  
 Prior service (credit) cost   -   -   (94)   -   -   28
 Net actuarial loss   1,334   -   380   1,358   -   546
Net periodic pension                  
 cost (benefit) $ 178 $ 242 $ 2,799 $ (252) $ 516 $ 3,232