Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2022

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value, Liabilities Measured on Recurring Basis

A summary of significant recurring fair value measurements by valuation hierarchy as of December 31, 2022 and 2021, is as follows:

			Fair Value Measurements Using
	Total as of		Quoted Prices in Active Markets for Identical Assets or Liabilities	Significant Other Observable Inputs	Significant Unobservable Inputs
Description	Dec 31, 2022		(Level 1)	(Level 2)	(Level 3)
	(In Thousands)
Investment in CSI Compressco	$	6,967	6,967	—	—
Investment in CarbonFree	6,139		—	—	6,139
Investment in Standard Lithium	1,180		1,180	—	—
Total	$	14,286

			Fair Value Measurements Using
	Total as of		Quoted Prices in Active Markets for Identical Assets or Liabilities	Significant Other Observable Inputs	Significant Unobservable Inputs
Description	Dec 31, 2021		(Level 1)	(Level 2)	(Level 3)
	(In Thousands)
Investments in CSI Compressco	$	6,233	6,233	—	—
Investments in CarbonFree	5,000		—	—	5,000
Total	$	11,233