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Fair Value Measurements - Market Risks and Derivative Hedge Contracts (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Derivatives, Fair Value [Line Items]    
Investments $ 12,333 $ 11,233
CSI Compressco    
Derivatives, Fair Value [Line Items]    
Total Investments 7,333 6,233
Standard Lithium    
Derivatives, Fair Value [Line Items]    
Total Investments 5,000 5,000
CSI Compressco | (Level 1)    
Derivatives, Fair Value [Line Items]    
Investments 7,333 6,233
CSI Compressco | (Level 2)    
Derivatives, Fair Value [Line Items]    
Investments 0 0
CSI Compressco | (Level 3)    
Derivatives, Fair Value [Line Items]    
Investments 0 0
Standard Lithium | (Level 1)    
Derivatives, Fair Value [Line Items]    
Investments 0 0
Standard Lithium | (Level 2)    
Derivatives, Fair Value [Line Items]    
Investments 0 0
Standard Lithium | (Level 3)    
Derivatives, Fair Value [Line Items]    
Investments $ 5,000 $ (5,000)