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Investments (Tables)
 6 Months Ended
Jun. 30, 2023
Investments in and Advances to Affiliates [Abstract]  
Summary of Investments
Our investments as of June 30, 2023 and December 31, 2022 consist of the following:
June 30, 2023December 31, 2022
(in thousands)
Investment in CSI Compressco
$6,599 $6,967 
Investment in CarbonFree6,269 6,139 
Investment in Standard Lithium3,600 1,180 
Other investment250 — 
Total Investments$16,718 $14,286