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Fair Value Measurements - Market Risks and Derivative Hedge Contracts (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Total investments | $ 16,405 | $ 14,286
CSI Compressco |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 7,228 | 6,967
CarbonFree |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 6,563 | 6,139
Standard Lithium |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 2,264 | 1,180
Other Investments |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 350 |
(Level 1) | CSI Compressco |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 7,228 | 6,967
(Level 1) | CarbonFree |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 0 | 0
(Level 1) | Standard Lithium |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 2,264 | 1,180
(Level 1) | Other Investments |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 0 |
(Level 2) | CSI Compressco |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 0 | 0
(Level 2) | CarbonFree |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 0 | 0
(Level 2) | Standard Lithium |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 0 | 0
(Level 2) | Other Investments |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 0 |
(Level 3) | CSI Compressco |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 0 | 0
(Level 3) | CarbonFree |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 6,563 | 6,139
(Level 3) | Standard Lithium |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 0 | $ 0
(Level 3) | Other Investments |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | $ 350 |

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