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Retirement Plans (Tables)
6 Months Ended
Jul. 04, 2015
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 4, 2015 and June 28, 2014 is as follows (in thousands):

    Three Months Ended
    July 4, 2015 June 28, 2014
    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 $ - $ 262 $ 1,337 $ - $ 199 $ 1,212
Interest cost   1,513   118   402   1,595   118   592
Expected return on plan                  
 assets   (2,318)   (122)   (410)   (2,308)   (107)   (392)
Net amortization:                  
 Prior service cost (credit)   -   -   14   -   (13)   (47)
 Net actuarial loss (gain)   679   -   273   485   (4)   97
Net periodic pension                  
 (benefit) cost $ (126) $ 258 $ 1,616 $ (228) $ 193 $ 1,462

    Six Months Ended
    July 4, 2015 June 28, 2014
    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 $ - $ 524 $ 2,674 $ - $ 398 $ 2,424
Interest cost   3,026   236   804   3,190   236   1,184
Expected return on plan                  
 assets   (4,636)   (244)   (820)   (4,616)   (214)   (784)
Net amortization:                  
 Prior service cost (credit)   -   -   28   -   (26)   (94)
 Net actuarial loss (gain)   1,358   -   546   970   (8)   194
Net periodic pension                  
 (benefit) cost $ (252) $ 516 $ 3,232 $ (456) $ 386 $ 2,924