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Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Pension Benefits | U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 0 $ 175 $ 0 $ 350
Interest Cost 284 298 567 596
Expected Return on Plan Assets (248) (322) (497) (644)
Recognized Net Actuarial Loss 8 135 16 270
Amortization of Prior Service Cost 0 0 0 0
Net Periodic Benefit Cost $ 44 $ 286 $ 86 $ 572
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 $ 86 $ 71
Interest Cost 28 30 57 60
Expected Return on Plan Assets (17) (11) (34) (22)
Recognized Net Actuarial Loss 5 15 10 31
Amortization of Prior Service Cost 0 2 0 4
Net Periodic Benefit Cost $ 59 $ 71 $ 119 $ 144
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount Rate (as a percentage) 2.81% 3.80% 2.81% 3.80%
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% 3.69% 2.99% 3.69%
Other Postretirement Benefits Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 1 $ 53 $ 2 $ 106
Interest Cost 37 43 75 86
Expected Return on Plan Assets (1) (1) (2) (2)
Recognized Net Actuarial Loss 3 34 6 68
Amortization of Prior Service Cost 0 22 0 44
Net Periodic Benefit Cost $ 40 $ 151 $ 81 $ 302
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%