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v3.25.2

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

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