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Retirement Plans (Tables)
3 Months Ended
Mar. 29, 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 months ended March 29, 2014 and March 30, 2013 is as follows (in thousands):

    Three Months Ended
    March 29, 2014 March 30, 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