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Investments (Tables)
6 Months Ended
Jun. 30, 2021
Investments in and Advances to Affiliates [Abstract]  
Summary of Investments
Our investments as of June 30, 2021 and December 31, 2020, consist of the following:
June 30, 2021December 31, 2020
(In Thousands)
Investment in CSI Compressco
$9,638 $— 
Investment in Standard Lithium6,583 2,675 
Total Investments$16,221 $2,675