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Investments (Tables)
 6 Months Ended
Jun. 30, 2022
Investments in and Advances to Affiliates [Abstract]  
Summary of Investments
Our investments as of June 30, 2022 and December 31, 2021, consist of the following:
June 30, 2022December 31, 2021
(in thousands)
Investment in CSI Compressco
$6,862 $6,233 
Investment in CarbonFree5,609 5,000 
Investment in Standard Lithium$1,696 $— 
Total Investments$14,167 $11,233