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Affiliate Costs, Due From Affiliates

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Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest, Shares

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Transactions with Affiliates - Narrative (Details) - USD ($)					3 Months Ended		6 Months Ended
	May 23, 2025	Mar. 31, 2025	Dec. 31, 2024	Oct. 31, 2021	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Related Party Transaction [Line Items]
Net, loss on non-trading derivative instruments					$ (6,412,000)	$ 3,180,000	$ (2,026,000)	$ (1,025,000)
Payment of distributions to non-controlling unitholders							13,686,000	4,495,000
Outstanding under subordinated note			$ 106,000,000		100,000,000		100,000,000
Amended And Restated Subordinated Promissory Note \| Subordinated Debt
Related Party Transaction [Line Items]
Face amount				$ 25,000,000
Basis spread on variable rate (in percent)				2.00%
Outstanding under subordinated note			$ 0		0		0
Amended And Restated Subordinated Promissory Note \| Subordinated Debt \| Minimum
Related Party Transaction [Line Items]
Subordinated debt, advances				$ 1,000,000
Amended And Restated Subordinated Promissory Note \| Subordinated Debt \| Maximum
Related Party Transaction [Line Items]
Subordinated debt, advances				$ 25,000,000
Common Class B
Related Party Transaction [Line Items]
Distribution to controlling interest (in shares)		262,891	206,273
Spark HoldCo
Related Party Transaction [Line Items]
Payment of distributions to non-controlling unitholders		$ 6,000,000	$ 5,000,000		3,000,000
NGE Texas, LLC
Related Party Transaction [Line Items]
Business combination, interest acquired, percentage	100.00%
Business combination, nominal purchase price	$ 1
Affiliated Entity
Related Party Transaction [Line Items]
Net, loss on non-trading derivative instruments					100,000	100,000	100,000	800,000
Affiliated Entity \| Allocated Overhead Costs
Related Party Transaction [Line Items]
Due from affiliates					(500,000)	(4,500,000)	(1,000,000)	(4,100,000)
Incremental costs					500,000	300,000	900,000	600,000
Affiliated Entity \| Payment of Income Taxes Incurred by The Company
Related Party Transaction [Line Items]
Distributions to affiliates					$ 4,900,000	$ 4,400,000	$ 4,900,000	$ 4,500,000