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Employee Benefit Plans - Schedule of Net Periodic Costs (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Components of Net Periodic Benefits Cost: |  |
Regulatory adjustments - deferred | $ (2,234) | $ (35,863)
Pension Benefits |  |
Components of Net Periodic Benefits Cost: |  |
Service cost | 850 | 846
Interest cost | 2,550 | 2,513
Expected return on plan assets | (3,009) | (2,623)
Amortization of prior service cost | 108 | 108
Amortization of actuarial (gain) loss | 0 | 0
Net periodic benefits costs under accounting standards | 499 | 844
Regulatory adjustments - deferred | 0 | (92)
Total expense (benefit) recognized, before surcharges and allocation to overhead pool | 499 | 752
Other Postretirement Benefits |  |
Components of Net Periodic Benefits Cost: |  |
Service cost | 32 | 33
Interest cost | 23 | 25
Expected return on plan assets | (142) | (120)
Amortization of prior service cost | 0 | 0
Amortization of actuarial (gain) loss | (263) | (240)
Net periodic benefits costs under accounting standards | (350) | (302)
Regulatory adjustments - deferred | 0 | 0
Total expense (benefit) recognized, before surcharges and allocation to overhead pool | (350) | (302)
SERP |  |
Components of Net Periodic Benefits Cost: |  |
Service cost | 358 | 312
Interest cost | 426 | 411
Expected return on plan assets | 0 | 0
Amortization of prior service cost | 0 | 0
Amortization of actuarial (gain) loss | (4) | (8)
Net periodic benefits costs under accounting standards | 780 | 715
Regulatory adjustments - deferred | 0 | 0
Total expense (benefit) recognized, before surcharges and allocation to overhead pool | $ 780 | $ 715

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + 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 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -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 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + 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 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -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 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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