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Retirement Plans (Tables)
6 Months Ended
Jun. 28, 2014
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 June 28, 2014 and June 29, 2013 is as follows (in thousands):

    Three Months Ended
    June 28, 2014 June 29, 2013
    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 $ - $ 199 $ 1,212 $ - $ 238 $ 1,152
Interest cost   1,595   118   592   1,419   85   499
Expected return on plan                  
 assets   (2,308)   (107)   (392)   (2,038)   (88)   (228)
Net amortization:                  
 Prior service credit   -   (13)   (47)   -   (13)   (62)
 Net actuarial loss (gain)   485   (4)   97   881   -   131
Net periodic pension                  
 (benefit) cost $ (228) $ 193 $ 1,462 $ 262 $ 222 $ 1,492

    Six Months Ended
    June 28, 2014 June 29, 2013
    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 $ - $ 398 $ 2,424 $ - $ 476 $ 2,304
Interest cost   3,190   236   1,184   2,838   170   998
Expected return on plan                  
 assets   (4,616)   (214)   (784)   (4,076)   (176)   (456)
Net amortization:                  
 Prior service credit   -   (26)   (94)   -   (26)   (124)
 Net actuarial loss (gain)   970   (8)   194   1,762   -   262
Net periodic pension                  
 (benefit) cost $ (456) $ 386 $ 2,924 $ 524 $ 444 $ 2,984