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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Transactions with Affiliates - Narrative (Details) - USD ($)				3 Months Ended
	May 23, 2025	Mar. 31, 2025	Oct. 31, 2021	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Related Party Transaction [Line Items]
Gain (loss) on non-trading derivative instruments				$ 9,086,000	$ 4,386,000
Payment of distributions to non-controlling unitholders				1,928,000	6,000,000
Payment of distributions				2,072,000	0
Outstanding under subordinated note				130,000,000		$ 120,000,000
Amended And Restated Subordinated Promissory Note \| Subordinated Debt
Related Party Transaction [Line Items]
Face amount			$ 25,000,000.0
Basis spread on variable rate (in percent)			2.00%
Outstanding under subordinated note				0		$ 0
Minimum \| Amended And Restated Subordinated Promissory Note \| Subordinated Debt
Related Party Transaction [Line Items]
Subordinated debt, advances	$ 1,000,000.0		$ 1,000,000.0
Maximum \| Amended And Restated Subordinated Promissory Note \| Subordinated Debt
Related Party Transaction [Line Items]
Subordinated debt, advances			$ 25,000,000.0
NGE Texas, LLC
Related Party Transaction [Line Items]
Business combination, interest acquired, percentage	100.00%
Business combination, nominal purchase price	$ 1
Common Class B
Related Party Transaction [Line Items]
Distribution to controlling interest (in shares)		262,891
Spark HoldCo
Related Party Transaction [Line Items]
Payment of distributions to non-controlling unitholders		$ 6,000,000.0		1,900,000
Related Party
Related Party Transaction [Line Items]
Gain (loss) on non-trading derivative instruments				(1,200,000)	(200,000)
Distributions to affiliates				100,000	0
Related Party \| Allocated Overhead Costs
Related Party Transaction [Line Items]
Due from affiliates				(2,400,000)	(600,000)
Incremental costs				$ 400,000	$ 400,000