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Investments (Tables)
 9 Months Ended
Sep. 30, 2023
Investments in and Advances to Affiliates [Abstract]  
Summary of Investments
Our investments as of September 30, 2023 and December 31, 2022 consist of the following:
September 30, 2023December 31, 2022
(in thousands)
Investment in CSI Compressco
$7,228 $6,967 
Investment in CarbonFree6,563 6,139 
Investment in Standard Lithium2,264 1,180 
Other investments
350 — 
Total Investments$16,405 $14,286