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Fair Value Measurements - Market Risks and Derivative Hedge Contracts (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Total Investments | $ 13,902 | $ 14,286
Investments | 13,902 | 14,286
CSI Compressco |  |
Derivatives, Fair Value [Line Items] |  |
Total Investments | 6,443 | 6,967
Standard Lithium |  |
Derivatives, Fair Value [Line Items] |  |
Total Investments | 1,520 | 1,180
CSI Compressco | (Level 1) |  |
Derivatives, Fair Value [Line Items] |  |
Investments | 6,443 | 6,967
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 | 5,939 | 6,139
Standard Lithium | (Level 1) |  |
Derivatives, Fair Value [Line Items] |  |
Investments | 1,520 | (1,180)
Standard Lithium | (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Investments | 0 | 0
Standard Lithium | (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Investments | $ 0 | $ 0

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