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Investments in Other Entities and Noncontrolling Interest in a Subsidiary - NG Advantage (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 29, 2020 | Feb. 06, 2020 | Oct. 01, 2018 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2019 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 24, 2020 | Oct. 14, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |  | $ 265,367,000 | $ 261,161,000 |  |  |
Payments to acquire additional controlling interest |  |  |  |  |  |  | 32,892,000 | 73,450,000 | $ 89,700,000 |  |
Loss from noncontrolling interest |  |  |  |  |  |  | (619,000) | (601,000) | (857,000) |  |
Impairment of investments in equity securities |  |  |  |  |  |  | 8,102,000 | 0 | 0 |  |
Investments carried at cost |  |  |  |  |  |  | $ 0 | 8,000,000 |  |  |
NG Advantage |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest after transaction (as a percent) |  |  |  |  |  |  | 93.30% |  |  |  |
NG Advantage |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired |  |  |  |  |  |  |  |  |  |  | 53.30%
Purchase of interest by parent, shares purchased (in shares) |  |  | 1,000,001 |  |  |  |  |  |  |  |
Debt issuance amount |  |  |  |  |  |  | $ 0 | $ 29,100,000 |  |  |
Outstanding balance |  |  |  |  |  |  | 47,500,000 |  |  |  |
Ownership interest before transaction (as a percent) |  | 64.60% | 53.50% | 53.30% |  |  |  |  |  |  |
Ownership interest after transaction (as a percent) |  | 93.20% | 61.70% | 53.50% |  | 64.60% |  | 93.30% |  |  |
Payments to acquire additional controlling interest |  |  | $ 5,000,000 |  |  |  |  |  |  |  |
Loss from noncontrolling interest |  |  |  |  |  |  | (600,000) | $ (600,000) | $ 900,000 |  |
Noncontrolling interest, fair value |  |  |  |  |  |  | $ 6,300,000 | $ 6,900,000 |  |  |
NG Advantage | Payment Obligations |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase of interest by parent, shares purchased (in shares) |  |  |  | 19,660 | 100,000 | 400,000 |  |  |  |  |
NG Advantage | Convertible Promissory Note November2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of common units to be called by warrants (in shares) |  |  |  |  |  |  |  |  | 2,086,879 |  |
Debt issuance amount |  |  |  |  |  |  |  |  | $ 26,700,000 |  |
Common unit purchase agreement | NG Advantage |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of equity by subsidiary to parent (in shares) | 283,019 |  |  |  |  |  |  |  |  |  |
Ownership interest after transaction (as a percent) |  |  |  |  |  |  | 93.30% |  |  |  |
Long-Term Natural Gas Purchase Contracts | NG Advantage | BP Products North America |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, liability (up to) |  |  |  | $ 30,000,000 |  |  |  |  |  | $ 15,000,000 |

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