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Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Pension Benefits | U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 0 $ 175 $ 0 $ 525
Interest Cost 283 298 850 894
Expected Return on Plan Assets (248) (322) (745) (966)
Recognized Net Actuarial Loss 8 135 24 405
Amortization of Prior Service Cost 0 0 0 0
Net Periodic Benefit Cost $ 43 $ 286 $ 129 $ 858
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount Rate (as a percentage) 4.10% 3.51% 4.10% 3.51%
Expected Long-Term Return on Plan Assets (as a percentage) 4.10% 4.50% 4.10% 4.50%
Rate of Compensation Increase (as a percentage) 0.00% 3.00% 0.00% 3.00%
Pension Benefits | Non-U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 43 $ 35 $ 129 $ 106
Interest Cost 27 30 84 90
Expected Return on Plan Assets (16) (11) (50) (33)
Recognized Net Actuarial Loss 5 15 15 46
Amortization of Prior Service Cost 0 2 0 6
Net Periodic Benefit Cost $ 59 $ 71 $ 178 $ 215
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount Rate (as a percentage) 2.82% 3.86% 2.81% 3.82%
Expected Long-Term Return on Plan Assets (as a percentage) 9.22% 7.43% 9.22% 7.43%
Rate of Compensation Increase (as a percentage) 2.99% 3.72% 2.99% 3.70%
Other Postretirement Benefits Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 1 $ 53 $ 3 $ 159
Interest Cost 37 43 112 129
Expected Return on Plan Assets (1) (1) (3) (3)
Recognized Net Actuarial Loss 3 34 9 102
Amortization of Prior Service Cost 0 22 0 66
Net Periodic Benefit Cost $ 40 $ 151 $ 121 $ 453
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount Rate (as a percentage) 4.44% 3.64% 4.44% 3.64%
Expected Long-Term Return on Plan Assets (as a percentage) 9.22% 7.43% 9.22% 7.43%
Rate of Compensation Increase (as a percentage) 5.57% 3.07% 5.57% 3.07%