Fair Value Measurements - Market Risks and Derivative Hedge Contracts (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Total Investments	$ 13,902	$ 14,286
Investments	13,902	14,286
CSI Compressco
Derivatives, Fair Value [Line Items]
Total Investments	6,443	6,967
Standard Lithium
Derivatives, Fair Value [Line Items]
Total Investments	1,520	1,180
CSI Compressco | (Level 1)
Derivatives, Fair Value [Line Items]
Investments	6,443	6,967
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	5,939	6,139
Standard Lithium | (Level 1)
Derivatives, Fair Value [Line Items]
Investments	1,520	(1,180)
Standard Lithium | (Level 2)
Derivatives, Fair Value [Line Items]
Investments	0	0
Standard Lithium | (Level 3)
Derivatives, Fair Value [Line Items]
Investments	$ 0	$ 0