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Retirement Plans (Tables)
6 Months Ended
Jul. 01, 2017
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 July 1, 2017 and July 2, 2016 is as follows (in thousands):

    Three Months Ended
    July 1, 2017 July 2, 2016
    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 $ 124 $ 170 $ 1,240 $ 94 $ 116 $ 1,250
Interest cost   1,696   159   368   1,745   135   429
Expected return on plan                  
 assets   (2,487)   (147)   (414)   (2,417)   (130)   (406)
Net amortization:                  
 Prior service credit   -   -   (47)   -   -   (49)
 Net actuarial loss   734   -   235   667   -   192
Net periodic pension                  
 cost $ 67 $ 182 $ 1,382 $ 89 $ 121 $ 1,416

    Six Months Ended
    July 1, 2017 July 2, 2016
    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 $ 225 $ 273 $ 2,491 $ 188 $ 232 $ 2,468
Interest cost   3,415   309   726   3,490   270   850
Expected return on plan                  
 assets   (5,150)   (294)   (816)   (4,834)   (260)   (805)
Net amortization:                  
 Prior service credit   -   -   (93)   -   -   (94)
 Net actuarial loss   1,385   -   466   1,334   -   380
Net periodic pension                  
 (benefit) cost $ (125) $ 288 $ 2,774 $ 178 $ 242 $ 2,799