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Investments - Summary of Investments (Details) - USD ($) $ in Thousands, shares in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in and Advances to Affiliates, at Fair Value | $ 11,233 | $ 11,233 | $ 2,675
CSI Compressco [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest | 3.80% |  |
CSI Compressco [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in and Advances to Affiliates, at Fair Value | $ 6,233 | $ 6,233 | 0
Standard Lithium [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Sale of Stock, Number of Shares Issued in Transaction |  | 1.6 |
Sale Of Stock, Consideration Received On Transaction, Gross |  | $ 17,600 |
Investments in and Advances to Affiliates, at Fair Value | 0 | 0 | 2,675
CarbonFree |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in and Advances to Affiliates, at Fair Value | 5,000 | 5,000 | $ 0
CarbonFree | Convertible Debt Securities |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Debt Securities, Available-for-sale | $ 5,000 | $ 5,000 |

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