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Fair Value Measurements - Market Risks and Derivative Hedge Contracts (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Total Investments | $ 14,167 | $ 11,233
Investments | 14,167 | 11,233
CSI Compressco |  |
Derivatives, Fair Value [Line Items] |  |
Total Investments | 6,862 | 6,233
Standard Lithium |  |
Derivatives, Fair Value [Line Items] |  |
Total Investments | 1,696 | 0
CSI Compressco | (Level 1) |  |
Derivatives, Fair Value [Line Items] |  |
Investments | 6,862 | 6,233
CSI Compressco | (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Investments | 0 | 0
CSI Compressco | (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Investments | 0 | 0
CarbonFree | (Level 1) |  |
Derivatives, Fair Value [Line Items] |  |
Investments | 0 |
CarbonFree | (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Investments | 0 |
CarbonFree | (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Investments | 5,609 |
Standard Lithium | (Level 1) |  |
Derivatives, Fair Value [Line Items] |  |
Investments | 1,696 | 0
Standard Lithium | (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Investments | 0 | 0
Standard Lithium | (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Investments | $ 0 | $ (5,000)

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