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Retirement Plans (Tables)
9 Months Ended
Oct. 01, 2016
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 1, 2016 and October 3, 2015 is as follows (in thousands):

    Three Months Ended
    October 1, 2016 October 3, 2015
    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 $ 94 $ 116 $ 1,253 $ - $ (91) $ 1,337
Interest cost   1,710   135   423   1,570   116   402
Expected return on plan                  
 assets   (2,392)   (130)   (401)   (2,223)   (129)   (410)
Net amortization:                  
 Prior service (credit) cost   -   -   (51)   -   -   14
 Net actuarial loss   693   -   190   1,101   -   273
Net periodic pension                  
 cost (benefit) $ 105 $ 121 $ 1,414 $ 448 $ (104) $ 1,616

    Nine Months Ended
    October 1, 2016 October 3, 2015
    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 $ 282 $ 348 $ 3,721 $ - $ 433 $ 4,011
Interest cost   5,200   405   1,273   4,596   352   1,206
Expected return on plan                  
 assets   (7,226)   (390)   (1,206)   (6,859)   (373)   (1,230)
Net amortization:                  
 Prior service (credit) cost   -   -   (145)   -   -   42
 Net actuarial loss   2,027   -   570   2,459   -   819
Net periodic pension                  
 cost $ 283 $ 363 $ 4,213 $ 196 $ 412 $ 4,848