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.