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Investments (Tables)
 3 Months Ended
Mar. 31, 2023
Investments in and Advances to Affiliates [Abstract]  
Summary of Investments
Our investments as of March 31, 2023 and December 31, 2022 consist of the following:
March 31, 2023December 31, 2022
(in thousands)
Investment in CSI Compressco
$6,443 $6,967 
Investment in CarbonFree5,939 6,139 
Investment in Standard Lithium1,520 1,180 
Total Investments$13,902 $14,286