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Fair Value Measurements - Market Risks and Derivative Hedge Contracts (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Total investments | $ 20,427 | $ 17,354
Kodiak |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 12,279 |
CarbonFree |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 6,798 |
Standard Lithium |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 1,000 |
Other Investments |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 350 |
(Level 1) | Kodiak |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 12,279 |
(Level 1) | CSI Compressco |  |
Derivatives, Fair Value [Line Items] |  |
Total investments |  | 8,538
(Level 1) | CarbonFree |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 0 | 0
(Level 1) | Standard Lithium |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 1,000 | 1,616
(Level 1) | Other Investments |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 0 | 0
(Level 2) | Kodiak |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 0 |
(Level 2) | CSI Compressco |  |
Derivatives, Fair Value [Line Items] |  |
Total investments |  | 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 | 0
(Level 3) | Kodiak |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 0 |
(Level 3) | CSI Compressco |  |
Derivatives, Fair Value [Line Items] |  |
Total investments |  | 0
(Level 3) | CarbonFree |  |
Derivatives, Fair Value [Line Items] |  |
Total investments | 6,798 | 6,850
(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 | $ 350

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