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Fair Value Measurements - CarbonFree (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |
Balance at beginning of period | $ 14,286 |  |
Change in fair value of embedded option | 9,112 | $ 4,465 | $ 17,468
Unrealized income (loss) on investment in CarbonFree convertible note | 727 | (72) | 0
Balance at end of period | 17,354 | 14,286 |
CarbonFree |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |
Balance at beginning of period | 6,139 | 5,000 | 0
Purchase of CarbonFree convertible note | 0 | 0 | 5,000
Change in fair value of embedded option | (16) | 1,211 | 0
Unrealized income (loss) on investment in CarbonFree convertible note | 727 | (72) | 0
Balance at end of period | $ 6,850 | $ 6,139 | $ 5,000

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