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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Other Post-Retirement      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 213 $ 175 $ 130
Interest cost 172 170 156
Expected return on plan assets (3) (2) (2)
Amortization of net actuarial loss 136 83 50
Amortization of prior service cost 86 88 88
Settlement loss 0 0 114
Curtailment loss 309 0 0
Net Periodic Benefit Cost 913 514 536
U.S. Pension | Pension benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 699 685 723
Interest cost 1,193 1,231 1,273
Expected return on plan assets (1,286) (1,326) (1,288)
Amortization of net actuarial loss 541 442 498
Amortization of prior service cost 0 53 55
Settlement loss 0 0 0
Curtailment loss 1,116 0 0
Net Periodic Benefit Cost 2,263 1,085 1,261
Non-U.S. Pension | Pension benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 173 148 102
Interest cost 126 114 107
Expected return on plan assets (42) (25) (25)
Amortization of net actuarial loss 63 38 39
Amortization of prior service cost 6 6 4
Settlement loss 0 0 0
Curtailment loss 0 0 0
Net Periodic Benefit Cost $ 326 $ 281 $ 227