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Investments (Tables)
3 Months Ended
Mar. 31, 2021
Investments in and Advances to Affiliates [Abstract]  
Summary of Investments
Our investments as of March 31, 2021 and December 31, 2020, consist of the following:
March 31, 2021December 31, 2020
(In Thousands)
Investment in CSI Compressco
$9,533 $— 
Investment in Standard Lithium3,787 2,675 
Total Investments13,320 2,675