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Investments (Tables)
 9 Months Ended
Sep. 30, 2022
Investments in and Advances to Affiliates [Abstract]  
Summary of Investments
Our investments as of September 30, 2022 and December 31, 2021 consist of the following:
September 30, 2022December 31, 2021
(in thousands)
Investment in CSI Compressco
$6,128 $6,233 
Investment in CarbonFree5,453 5,000 
Investment in Standard Lithium1,732 — 
Total Investments$13,313 $11,233