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Accounting For Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Deferred income tax assets: |  |
Regulatory liabilities | $ 192,099 | $ 197,998
Tax credits and net operating loss carryforwards | 76,969 | 74,782
Provisions for pensions | 19,100 | 20,132
Other | 47,839 | 54,903
Total gross deferred income tax assets | 336,007 | 347,815
Valuation allowances for deferred tax assets | (10,461) | (3,874)
Total deferred income tax assets after valuation allowances | 325,546 | 343,941
Deferred income tax liabilities: |  |
Utility property, plant, and equipment | 746,876 | 712,470
Regulatory assets | 268,833 | 281,483
Other | 28,155 | 24,983
Total deferred income tax liabilities | 1,043,864 | 1,018,936
Net long-term deferred income tax liability | $ 718,318 | $ 674,995

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