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Investments in Other Entities and Noncontrolling Interest in a Subsidiary - NG Advantage (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Oct. 14, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |
Outstanding balance | $ 261,968 |  | $ 261,161 |
Loss from noncontrolling interest | (173) | $ (135) |  |
Investments carried at cost | 8,000 |  |  |
NG Advantage | NG Advantage |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Loss from noncontrolling interest | 200 | $ 100 |  |
Noncontrolling interest, fair value | $ 6,700 |  | $ 6,900 |
Common unit purchase agreement | NG Advantage |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest acquired |  |  |  | 53.30%
Ownership interest after transaction (as a percent) | 93.30% |  |  |

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