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Employee Benefit Plans - Changes in Plans and AOCI Impacts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Pension benefits | U.S. Pension      
Change in Projected Benefit Obligation:      
Projected benefit obligation at beginning of year $ 34,757 $ 31,935  
Acquisition 0 0  
Service cost 699 685 $ 723
Interest cost 1,193 1,231 1,273
Actuarial (gain) loss (2,674) 2,626  
Benefits paid (1,589) (1,720)  
Plan amendment 1,116 0  
Effect of curtailment (3,787) 0  
Currency translation 0 0  
Projected benefit obligation at end of year 29,715 34,757 31,935
Change in Plan Assets:      
Fair value of plan assets at beginning of year 31,754 28,985  
Actual return on plan assets (1,436) 3,409  
Employer contributions 0 1,080  
Benefits paid (1,589) (1,720)  
Currency translation 0 0  
Fair value of plan assets at end of year 28,729 31,754 28,985
Unfunded Status (986) (3,003)  
Accumulated Benefit Obligation at End of Year 29,715 30,311  
Current liability (986) 0  
Non-current liability 0 (3,003)  
Unrecognized net actuarial loss (3,205) (7,485)  
Unrecognized prior service cost 0 0  
Total (3,205) (7,485)  
Net actuarial (loss) gain (48) (544)  
Amortization of net actuarial loss 541 442  
Amortization of prior service cost 0 53  
Plan amendment (1,116) 0  
Effect of curtailment 3,787 0  
Curtailment loss 1,116 0  
Currency translation 0 0  
Total 4,280 (49)  
Pension benefits | Non-U.S. Pension      
Change in Projected Benefit Obligation:      
Projected benefit obligation at beginning of year 4,270 3,341  
Acquisition 0 241  
Service cost 173 148 102
Interest cost 126 114 107
Actuarial (gain) loss (368) 270  
Benefits paid (394) (265)  
Plan amendment 0 0  
Effect of curtailment 0 0  
Currency translation (136) 421  
Projected benefit obligation at end of year 3,671 4,270 3,341
Change in Plan Assets:      
Fair value of plan assets at beginning of year 557 426  
Actual return on plan assets 38 23  
Employer contributions 528 355  
Benefits paid (394) (265)  
Currency translation (3) 18  
Fair value of plan assets at end of year 726 557 426
Unfunded Status (2,945) (3,713)  
Accumulated Benefit Obligation at End of Year 2,604 3,047  
Current liability (58) (205)  
Non-current liability (2,887) (3,508)  
Unrecognized net actuarial loss (674) (1,085)  
Unrecognized prior service cost (45) (52)  
Total (719) (1,137)  
Net actuarial (loss) gain 368 (277)  
Amortization of net actuarial loss 63 38  
Amortization of prior service cost 6 6  
Plan amendment 0 0  
Effect of curtailment 0 0  
Curtailment loss 0 0  
Currency translation (19) (78)  
Total 418 (311)  
Other Post-Retirement      
Change in Projected Benefit Obligation:      
Projected benefit obligation at beginning of year 4,704 3,894  
Acquisition 0 0  
Service cost 213 175 130
Interest cost 172 170 156
Actuarial (gain) loss (508) 635  
Benefits paid (157) (175)  
Plan amendment 322 0  
Effect of curtailment (1,075) 0  
Currency translation 1 5  
Projected benefit obligation at end of year 3,672 4,704 3,894
Change in Plan Assets:      
Fair value of plan assets at beginning of year 35 28  
Actual return on plan assets 2 1  
Employer contributions 164 179  
Benefits paid (157) (175)  
Currency translation 0 2  
Fair value of plan assets at end of year 44 35 $ 28
Unfunded Status (3,628) (4,669)  
Accumulated Benefit Obligation at End of Year 0 0  
Current liability (144) (173)  
Non-current liability (3,484) (4,496)  
Unrecognized net actuarial loss (69) (1,424)  
Unrecognized prior service cost 0 (439)  
Total (69) (1,863)  
Net actuarial (loss) gain 508 (634)  
Amortization of net actuarial loss 136 83  
Amortization of prior service cost 86 88  
Plan amendment (322) 0  
Effect of curtailment 1,075 0  
Curtailment loss 309 0  
Currency translation 2 (3)  
Total $ 1,794 $ (466)