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Investments in and Advances to Affiliates (Tables)
12 Months Ended
Dec. 31, 2021
Investments in and Advances to Affiliates [Abstract]  
Investments in and Advances to Affiliates
Our investments as of December 31, 2021 and 2020, consist of the following:

 December 31,
 20212020
 (In Thousands)
Investment in CSI Compressco$6,233 $— 
Investment in CarbonFree5,000 — 
Investment in Standard Lithium— 2,675 
Total investments$11,233 $2,675