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Fair Value Measurements - Recurring Basis - Investment in ECOTEC - Changes in FV (Details) - ECOTEC - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of changes in fair value |  |
Unrealized loss | $ 1,000 | $ 1,900
Equity investment |  |
Reconciliation of changes in fair value |  |
Balance, beginning of period | 12,803 |
Purchases of equity interests | 3,075 | 14,667
Unrealized loss | (973) | (1,864)
Balance, end of period | $ 14,905 | $ 12,803

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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