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Fair Value Measurements - Reconciliation of changes in FV of investment (Details) - Ecotec - Equity investment - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Reconciliation of changes in fair value |  |  |  |
Balance, beginning of period | $ 14,549 |  | $ 12,803 |
Purchases of equity interests |  | $ 8,000 | 2,000 | $ 8,000
Unrealized loss | (1,742) |  | (1,996) |
Balance, end of period | $ 12,807 | $ 8,000 | $ 12,807 | $ 8,000

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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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