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Investments
 12 Months Ended
Dec. 31, 2023
Investments in and Advances to Affiliates [Abstract]  
Investments INVESTMENTS
Our investments as of December 31, 2023 and 2022, consist of the following:
 December 31,
 20232022
 (In Thousands)
Investment in CSI Compressco$8,538 $6,967 
Investment in CarbonFree6,850 6,139 
Investment in Standard Lithium1,616 1,180 
Other investments
350 — 
Total investments$17,354 $14,286 

We continue to own approximately 3.7% of the outstanding CSI Compressco common units (NASDAQ: CCLP) as of December 31, 2023.

CarbonFree is a carbon capture company with patented technologies that capture CO2 and mineralize emissions to make commercial, carbon-negative chemicals. We have an intellectual property joint development agreement in place with CarbonFree to evaluate potential new technologies. In December 2021, we invested $5.0 million in a convertible note issued by CarbonFree. Interest on the convertible note is capitalized into the convertible note annually in December. Our exposure to potential losses by CarbonFree is limited to our investment in the convertible note and associated interest.

In addition, we are party to agreements whereby Standard Lithium has the right to explore for, and an option to acquire the rights to produce and extract, lithium in our Arkansas leases and other additional potential resources in the Mojave region of California. The Company receives cash and stock of Standard Lithium under the terms of the arrangements.

See Note 14 - “Fair Value Measurements” for further information.