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Employee Benefit Plans - Change in PBO (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Mar. 25, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in projected benefit obligation: |  |  |  |
Balance, January 1 |  | $ 34,009,000 | $ 26,892,000 |
Service cost |  | 1,614,000 | 1,430,000 | $ 1,707,000
Interest cost |  | 1,127,000 | 1,169,000 | 1,037,000
Actuarial loss |  | 933,000 | 5,164,000 |
Benefits paid |  | (726,000) | (646,000) |
Balance, December 31 |  | 36,957,000 | 34,009,000 | 26,892,000
Change in plan assets: |  |  |  |
Fair value, January 1 |  | 25,689,000 | 19,672,000 |
Actual return on plan assets |  | 4,725,000 | 5,164,000 |
Employer contribution | $ 500,000 | 500,000 | 1,610,000 |
Expenses paid |  | (104,000) | (111,000) |
Benefits paid |  | (726,000) | (646,000) |
Fair value, December 31 |  | 30,084,000 | 25,689,000 | $ 19,672,000
Funded status at end of year |  | (6,873,000) | (8,320,000) |
Accumulated benefit obligation |  | 30,156,000 | 26,380,000 |
Amounts recognized in the statement of financial position consist of the following: |  |  |  |
Noncurrent liabilities |  | (6,873,000) | (8,320,000) |
Net amount recognized at December 31, balance sheet |  | $ (6,873,000) | $ (8,320,000) |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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