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Segment Information - Summarized Financial Information by Reportable Segments (Footnote) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Mark-to-market (loss) gain on public equity securities | $ 200 | $ (17,800) | $ (4,800) | $ (27,200)
(Loss) gain in fair value of public equity securities | 186 | (17,780) | (4,836) | (60,939)
Other income, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Mark-to-market (loss) gain on public equity securities |  | 17,800 |  | (27,200)
(Loss) gain in fair value of public equity securities | (38,000) |  | (38,000) | (33,700)
Gain (loss) on sale of assets |  |  |  | 17,300
Preferred equity gain | 10,100 | 8,900 | 19,800 | 17,600
Liability releases |  | 600 |  | 600
Charges for asset retirement obligations |  |  | 1,900 | 2,900
Gain (loss) from adjustment of indemnification related to previously disposed businesses |  |  | (1,900) | (2,400)
Selling, general and administrative expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gain (loss) on sale of assets | 8,300 |  | 11,400 |
Severance expenses | $ 1,800 |  | 1,800 |
Legal costs |  | $ 5,100 | $ 600 | 5,200
Cost of goods sold |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-routine labor costs |  |  |  | $ 1,400
Windfield |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Ownership percentage | 49.00% |  | 49.00% |

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