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Retirement Plans (Tables)
9 Months Ended
Sep. 27, 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 nine months ended September 27, 2014 and September 28, 2013 is as follows (in thousands):

    Three Months Ended
    September 27, 2014 September 28, 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 $ - $ 196 $ 1,212 $ - $ 238 $ 1,152
Interest cost   1,623   111   592   1,290   85   499
Expected return on plan                  
 assets   (2,179)   (112)   (392)   (1,951)   (88)   (228)
Net amortization:                  
 Prior service credit   -   (13)   (47)   -   (13)   (62)
 Net actuarial loss (gain)   692   (18)   97   812   -   131
Net periodic pension                  
 cost $ 136 $ 164 $ 1,462 $ 151 $ 222 $ 1,492

    Nine Months Ended
    September 27, 2014 September 28, 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 $ - $ 594 $ 3,636 $ - $ 714 $ 3,456
Interest cost   4,813   347   1,776   4,128   255   1,497
Expected return on plan                  
 assets   (6,795)   (326)   (1,176)   (6,027)   (264)   (684)
Net amortization:                  
 Prior service credit   -   (39)   (141)   -   (39)   (186)
 Net actuarial loss (gain)   1,662   (26)   291   2,574   -   393
Net periodic pension                  
 (benefit) cost $ (320) $ 550 $ 4,386 $ 675 $ 666 $ 4,476