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Investments | 3 Months Ended
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Mar. 31, 2024
Investments in and Advances to Affiliates [Abstract] |
Investments | INVESTMENTS Our investments as of March 31, 2024 and December 31, 2023 consist of the following:
| March 31, 2024 |  | December 31, 2023
| (in thousands)
Investment in CSI Compressco | $ | 12,204 |  |  | $ | 8,538 |
Investment in CarbonFree | 6,888 |  |  | 6,850 |
Investment in Standard Lithium | 944 |  |  | 1,616 |
Other investments | 350 |  |  | 350 |
Total Investments | $ | 20,386 |  |  | $ | 17,354 |
Following the January 2021 sale of the general partner of CSI Compressco LP (“CSI Compressco”), we owned approximately 3.7% of the outstanding CSI Compressco common units (NASDAQ: CCLP) as of March 31, 2024. CSI Compressco was acquired by Kodiak Gas Services, Inc. (NYSE: KGS) (“Kodiak”) on April 1, 2024. See Note 10 - “Subsequent Events” for further information. CarbonFree Chemicals Holdings LLC (“CarbonFree”) is a carbon capture company with patented technologies that capture CO 2 and mineralize emissions to make commercial, carbon-negative chemicals. In December 2021, we invested $5.0 million in a convertible note issued by CarbonFree. During the three month period ended March 31, 2024, the convertible note agreement was amended and, in connection with that amendment, note holders agreed to defer their right to electively convert the convertible notes to common units of CarbonFree (“CarbonFree Units”) for two years. In exchange for the amendment, we received CarbonFree Units representing less than 1% of the CarbonFree Units outstanding as of March 31, 2024. The CarbonFree Units are not publicly traded and may not be offered, sold, transferred or pledged until such common units are registered pursuant to an effective registration statement or pursuant to an exemption from registration. Our exposure to potential losses by CarbonFree is limited to our investment, including capitalized and accrued interest associated with the CarbonFree convertible note and CarbonFree Units. We are party to agreements whereby Standard Lithium Ltd. (NYSE: SLI) (“Standard Lithium”) has the rights to produce and extract lithium in a portion of our Arkansas leases. The Company received stock of Standard Lithium under the terms of its arrangements. See Note 7 - “Fair Value Measurements” for further information.

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