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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Contributions to noncontributory defined benefit plan     $ 810  
Expected contributions to noncontributory defined benefit plan for the remainder of the year     270  
Other Benefits [Member]        
Components of Net Periodic Benefit Cost:        
Service cost $ 43 $ 33 131 $ 99
Interest cost 43 38 127 114
Expected return on plan assets (1) (1) (1) (1)
Recognized net actuarial loss 22 12 62 36
Amortization of prior service cost 22 22 66 67
Settlement loss     0 114
Net Periodic Benefit Cost $ 129 $ 104 $ 385 $ 429
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount Rate (as a percentage) 4.12% 4.30% 4.12% 4.28%
Expected Long-Term Return on Plan Assets (as a percentage) 7.72% 6.90% 7.72% 6.90%
Rate of Compensation Increase (as a percentage) 3.08% 3.03% 3.07% 3.02%
U.S. [Member] | Pension Benefits [Member]        
Components of Net Periodic Benefit Cost:        
Service cost $ 171 $ 181 $ 514 $ 543
Interest cost 307 318 923 954
Expected return on plan assets (331) (322) (994) (966)
Recognized net actuarial loss 110 124 331 372
Amortization of prior service cost 14 14 40 42
Settlement loss     0 0
Net Periodic Benefit Cost $ 271 $ 315 $ 814 $ 945
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount Rate (as a percentage) 4.03% 4.22% 4.03% 4.22%
Expected Long-Term Return on Plan Assets (as a percentage) 5.00% 5.00% 5.00% 5.00%
Rate of Compensation Increase (as a percentage) 3.00% 3.00% 3.00% 3.00%
Non-U.S. [Member] | Pension Benefits [Member]        
Components of Net Periodic Benefit Cost:        
Service cost $ 35 $ 25 $ 100 $ 77
Interest cost 28 26 78 78
Expected return on plan assets (10) (5) (27) (19)
Recognized net actuarial loss 10 9 28 29
Amortization of prior service cost 2 2 4 4
Settlement loss     0 0
Net Periodic Benefit Cost $ 65 $ 57 $ 183 $ 169
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount Rate (as a percentage) 3.42% 3.85% 3.43% 3.88%
Expected Long-Term Return on Plan Assets (as a percentage) 7.72% 6.90% 7.72% 6.90%
Rate of Compensation Increase (as a percentage) 3.41% 2.98% 3.42% 2.98%