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Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Pension Benefits [Member] | U.S. [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 175 $ 147 $ 350 $ 343
Interest Cost 298 302 596 616
Expected Return on Plan Assets (322) (328) (644) (663)
Recognized Net Actuarial Loss 135 108 270 221
Amortization of Prior Service Cost 0 13 0 26
Net Periodic Benefit Cost $ 286 $ 242 $ 572 $ 543
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount Rate (as a percentage) 3.51% 4.03% 3.51% 4.03%
Expected Long-Term Return on Plan Assets (as a percentage) 4.50% 5.00% 4.50% 5.00%
Rate of Compensation Increase (as a percentage) 3.00% 3.00% 3.00% 3.00%
Pension Benefits [Member] | Non-U.S. [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 35 $ 33 $ 71 $ 65
Interest Cost 30 26 60 50
Expected Return on Plan Assets (11) (9) (22) (17)
Recognized Net Actuarial Loss 15 9 31 18
Amortization of Prior Service Cost 2 1 4 2
Net Periodic Benefit Cost $ 71 $ 60 $ 144 $ 118
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount Rate (as a percentage) 3.80% 3.47% 3.80% 3.43%
Expected Long-Term Return on Plan Assets (as a percentage) 7.43% 7.72% 7.43% 7.72%
Rate of Compensation Increase (as a percentage) 3.69% 3.44% 3.69% 3.42%
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 53 $ 53 $ 106 $ 88
Interest Cost 43 45 86 84
Expected Return on Plan Assets (1) 0 (2) 0
Recognized Net Actuarial Loss 34 27 68 40
Amortization of Prior Service Cost 22 23 44 44
Net Periodic Benefit Cost $ 151 $ 148 $ 302 $ 256
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount Rate (as a percentage) 3.64% 4.11% 3.64% 4.12%
Expected Long-Term Return on Plan Assets (as a percentage) 7.43% 7.72% 7.43% 7.72%
Rate of Compensation Increase (as a percentage) 3.07% 3.06% 3.07% 3.07%