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Retirement Plans (Tables)
9 Months Ended
Oct. 03, 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 nine months ended October 3, 2015 and September 27, 2014 is as follows (in thousands):

    Three Months Ended
    October 3, 2015 September 27, 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 $ - $ (91) $ 1,337 $ - $ 196 $ 1,212
Interest cost   1,570   116   402   1,623   111   592
Expected return on plan                  
 assets   (2,223)   (129)   (410)   (2,179)   (112)   (392)
Net amortization:                  
 Prior service cost (credit)   -   -   14   -   (13)   (47)
 Net actuarial loss (gain)   1,101   -   273   692   (18)   97
Net periodic pension                  
 cost (benefit) $ 448 $ (104) $ 1,616 $ 136 $ 164 $ 1,462

    Nine Months Ended
    October 3, 2015 September 27, 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 $ - $ 433 $ 4,011 $ - $ 594 $ 3,636
Interest cost   4,596   352   1,206   4,813   347   1,776
Expected return on plan                  
 assets   (6,859)   (373)   (1,230)   (6,795)   (326)   (1,176)
Net amortization:                  
 Prior service cost (credit)   -   -   42   -   (39)   (141)
 Net actuarial loss (gain)   2,459   -   819   1,662   (26)   291
Net periodic pension                  
 cost (benefit) $ 196 $ 412 $ 4,848 $ (320) $ 550 $ 4,386