Fair Value Measurements - Market Risks and Derivative Hedge Contracts (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Total Investments	$ 13,313	$ 11,233
Investments	13,313	11,233
CSI Compressco
Derivatives, Fair Value [Line Items]
Total Investments	6,128	6,233
Standard Lithium
Derivatives, Fair Value [Line Items]
Total Investments	1,732	0
CSI Compressco | (Level 1)
Derivatives, Fair Value [Line Items]
Investments	6,128	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
CarbonFree | (Level 1)
Derivatives, Fair Value [Line Items]
Investments	0
CarbonFree | (Level 2)
Derivatives, Fair Value [Line Items]
Investments	0
CarbonFree | (Level 3)
Derivatives, Fair Value [Line Items]
Investments	5,453
Standard Lithium | (Level 1)
Derivatives, Fair Value [Line Items]
Investments	1,732	0
Standard Lithium | (Level 2)
Derivatives, Fair Value [Line Items]
Investments	0	0
Standard Lithium | (Level 3)
Derivatives, Fair Value [Line Items]
Investments	$ 0	$ (5,000)