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Fair Value - Schedule of Activity For Energy Commodity Derivative Assets (Liabilities) Measured At Fair Value and Equity Investments Using Significant Unobservable Inputs (Level 3) (Details) - Level 3 [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning Balance |  | $ 44,426 | $ 39,952 | $ 42,004 | $ 36,550
Included in regulatory assets/liabilities |  | (906) | (1,016) | (18) | 5,767
Recognized in net income |  | $ (1,472) | $ (2,561) | $ (842) | $ (5,198)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense)
Purchases and debt conversions |  |  |  | $ 945 | $ 2,367
Settlements |  | $ 328 | $ 357 | 287 | 246
Other |  |  |  |  | (3,000)
Ending Balance |  | 42,376 | 36,732 | 42,376 | 36,732
Equity Investment [Member] |  |  |  |  |
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning Balance |  | 51,829 | 51,014 | 50,254 | 54,284
Recognized in net income |  | $ (1,472) | $ (2,561) | $ (842) | $ (5,198)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense)
Purchases and debt conversions |  |  |  | $ 945 | $ 2,367
Other |  |  |  |  | (3,000)
Ending Balance |  | $ 50,357 | $ 48,453 | 50,357 | 48,453
Natural Gas Exchange Agreements [Member] |  |  |  |  |
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning Balance | [1] | (7,403) | (11,062) | (8,250) | (17,734)
Included in regulatory assets/liabilities | [1] | (906) | (1,016) | (18) | 5,767
Settlements | [1] | 328 | 357 | 287 | 246
Ending Balance | [1] | $ (7,981) | $ (11,721) | $ (7,981) | $ (11,721)
[1] | There were no purchases, issuances or transfers from other categories during the periods presented in the table above.

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