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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) |

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