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Benefit Plans - Reconciliation of Funded Status (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in plan assets |  |  |
Fair value of assets at beginning of year | $ 306,711 |  |
Fair value of plan assets at end of year | 331,172 | $ 306,711 |
Pension Benefits |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 297,834 | 289,123 |
Service cost | 6,662 | 7,569 | $ 9,359
Interest cost | 14,451 | 14,234 | 10,708
Actuarial loss (gain) | (14,816) | 5,794 |
Implicit rate subsidy | 0 | 0 |
Plan participants contributions | 0 | 0 |
Administrative expenses paid | (146) | (137) |
Benefits paid and settlements | (16,941) | (18,749) |
Benefit obligation at end of year | 287,044 | 297,834 | 289,123
Change in plan assets |  |  |
Fair value of assets at beginning of year | 285,504 | 251,960 |
Actual return on plan assets | 31,523 | 41,285 |
Employer contributions | 8,007 | 11,145 |
Plan participants contributions | 0 | 0 |
Administrative expenses paid | (146) | (137) |
Benefits paid and settlements | (16,941) | (18,749) |
Fair value of plan assets at end of year | 307,947 | 285,504 | 251,960
Funded status at end of year | 20,903 | (12,330) |
Other Postretirement Benefits |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 24,264 | 25,830 |
Service cost | 665 | 638 | 1,032
Interest cost | 1,181 | 1,268 | 883
Actuarial loss (gain) | (146) | (2,645) |
Implicit rate subsidy | (336) | (237) |
Plan participants contributions | 183 | 179 |
Administrative expenses paid | 0 | 0 |
Benefits paid and settlements | (731) | (769) |
Benefit obligation at end of year | 25,080 | 24,264 | 25,830
Change in plan assets |  |  |
Fair value of assets at beginning of year | 21,207 | 17,952 |
Actual return on plan assets | 2,879 | 3,136 |
Employer contributions | 7 | 920 |
Plan participants contributions | 183 | 179 |
Administrative expenses paid | (71) | (67) |
Benefits paid and settlements | (980) | (913) |
Fair value of plan assets at end of year | 23,225 | 21,207 | $ 17,952
Funded status at end of year | $ (1,855) | $ (3,057) |

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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/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + 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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + 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 -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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