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Employee Retirement Plans - Reconciliations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Component of net periodic cost: |  |  |
Effect of settlement for termination |  | $ 6,380 |
Amounts recognized in the consolidated balance sheets consisted |  |  |
Retiree health benefit obligation | $ 15,804 | 14,017 |
Pension plan |  |  |
Component of net periodic cost: |  |  |
Service cost |  |  | $ 409
Interest cost |  | 1,642 | 1,555
Expected return on plan assets |  | (1,175) | (1,901)
Amortization of net (gain) loss |  | 595 | 706
Effect of settlement for termination |  | 6,380 |
Net periodic pension cost |  | 7,442 | 769
Employer contributions during the period |  | 460 |
Change in projected benefit obligation: |  |  |
Benefit obligation at beginning of year |  | 40,182 |
Actuarial (gain) loss |  | 166 |
Benefits paid |  | (1,451) |
Benefit obligation at end of year |  |  | 40,182
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year |  | 38,053 |
Actual return on plan assets |  | 3,477 |
Benefits paid |  | (1,451) |
Pension settlement |  | (40,539) |
Fair value of plan assets at end of year |  |  | 38,053
Funded status at end of year |  |  |
Salaried Pension Plan |  |  |
Accumulated benefit obligation |  | 0 | 40,182
Pension plan | Minimum |  |  |
Component of net periodic cost: |  |  |
Employer contributions during the period |  | 0 |
Other postretirement benefit cost |  |  |
Component of net periodic cost: |  |  |
Service cost | 147 | 149 | 189
Interest cost | 191 | 252 | 233
Amortization of net (gain) loss | (310) | (312) | (211)
Net periodic pension cost | 28 | 89 | 211
Change in projected benefit obligation: |  |  |
Benefit obligation at beginning of year | 6,538 | 6,420 |
Participant contributions | 55 | 38 |
Actuarial (gain) loss | (178) | (266) |
Benefits paid | (17) | (55) |
Benefit obligation at end of year | 6,736 | 6,538 | $ 6,420
Change in plan assets: |  |  |
Benefits paid | $ (17) | (55) |
Period of coverage under the plan | 10 years |  |
Amounts recognized in the consolidated balance sheets consisted |  |  |
Accrued expenses and other current liabilities | $ 250 | 200 |
Retiree health benefit obligation | 6,486 | 6,338 |
Amounts recognized in the consolidated balance sheets | $ 6,736 | $ 6,538 |
Salaried Pension Plan |  |  |
Period of service of employees | 12 years |  |

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