Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Investment

The changes in our investment in CarbonFree for the years ended December 31, 2023, 2022, and 2021 were as follows:

	Year Ended December 31,
	2023		2022		2021
At beginning of period	$	6,139	$	5,000	$	—
Purchase of CarbonFree convertible note	—		—		5,000
Change in fair value of embedded option	(16)		1,211		—
Change in fair value of convertible note, excluding embedded option	727		(72)		—
At end of period	$	6,850	$	6,139	$	5,000

Fair Value, Liabilities Measured on Recurring Basis

A summary of significant recurring fair value measurements by valuation hierarchy as of December 31, 2023 and 2022, 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, 2023		(Level 1)	(Level 2)	(Level 3)
	(In Thousands)
Investment in CSI Compressco	$	8,538	8,538	—	—
Investment in CarbonFree	6,850		—	—	6,850
Investment in Standard Lithium	1,616		1,616	—	—

			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)
Investments in CSI Compressco	$	6,967	6,967	—	—
Investments in CarbonFree	6,139		—	—	6,139
Investments in Standard Lithium	1,180		1,180	—	—