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Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Pension Benefits | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost $ 0 $ 175
Interest Cost 283 298
Expected Return on Plan Assets (249) (322)
Recognized Net Actuarial Loss 8 135
Amortization of Prior Service Cost 0 0
Net Periodic Benefit Cost $ 42 $ 286
The weighted average assumptions used to determine net periodic benefit cost are as follows:    
Discount Rate (as a percentage) 4.10% 3.51%
Expected Long-Term Return on Plan Assets (as a percentage) 4.10% 4.50%
Rate of Compensation Increase (as a percentage) 0.00% 3.00%
Pension Benefits | Non-U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost $ 43 $ 36
Interest Cost 29 30
Expected Return on Plan Assets (17) (11)
Recognized Net Actuarial Loss 5 16
Amortization of Prior Service Cost 0 2
Net Periodic Benefit Cost $ 60 $ 73
The weighted average assumptions used to determine net periodic benefit cost are as follows:    
Discount Rate (as a percentage) 2.80% 3.80%
Expected Long-Term Return on Plan Assets (as a percentage) 9.22% 7.43%
Rate of Compensation Increase (as a percentage) 2.98% 3.69%
Other Postretirement Benefits Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost $ 1 $ 53
Interest Cost 38 43
Expected Return on Plan Assets (1) (1)
Recognized Net Actuarial Loss 3 34
Amortization of Prior Service Cost 0 22
Net Periodic Benefit Cost $ 41 $ 151
The weighted average assumptions used to determine net periodic benefit cost are as follows:    
Discount Rate (as a percentage) 4.44% 3.65%
Expected Long-Term Return on Plan Assets (as a percentage) 9.22% 7.43%
Rate of Compensation Increase (as a percentage) 5.57% 3.07%