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Benefit Plans - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Pension and Supplemental Executive Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net Actuarial (Gain)/Loss | $ 79,309 | $ 89,711 |
Net Prior Service Cost/(Credit) | 2,900 | 3,245 |
Net Transition Obligation/(Asset) | 0 | 0 |
Total at Year End | 82,209 | 92,956 | $ 83,298
Other Postretirement Benefit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net Actuarial (Gain)/Loss | (30,804) | (13,781) |
Net Prior Service Cost/(Credit) | 11,041 | 13,249 |
Net Transition Obligation/(Asset) | 0 | 0 |
Total at Year End | $ (19,763) | $ (532) | $ (44,891)

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for transition asset (obligation) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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