Transactions with Affiliates - Narrative (Details) - USD ($)				3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Oct. 31, 2021	Mar. 31, 2025	Mar. 31, 2024
Related Party Transaction [Line Items]
Net, loss on non-trading derivative instruments				$ 4,386,000	$ (4,205,000)
Payment of distributions to non-controlling unitholders				6,000,000	93,000
Outstanding under subordinated note	$ 101,000,000	$ 106,000,000		101,000,000
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
Affiliated Entity
Related Party Transaction [Line Items]
Net, loss on non-trading derivative instruments				200,000	800,000
Affiliated Entity | Allocated Overhead Costs
Related Party Transaction [Line Items]
Due from affiliates				600,000
Due to affiliates					400,000
Incremental costs				400,000	300,000
Affiliated Entity | Payment of Income Taxes Incurred by The Company
Related Party Transaction [Line Items]
Distributions to affiliates				$ 0	$ (100,000)