Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2022

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value Measurements, Recurring and Nonrecurring

Recurring and nonrecurring fair value measurements by valuation hierarchy as of June 30, 2022 and December 31, 2021, are 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	June 30, 2022		(Level 1)		(Level 2)		(Level 3)
	(in thousands)
Investment in CSI Compressco	$	6,862	$	6,862	$	—	$	—
Investment in CarbonFree	5,609		—		—		5,609
Investment in Standard Lithium	1,696		1,696		—		—

Investments	$	14,167


			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	December 31, 2021		(Level 1)		(Level 2)		(Level 3)
	(in thousands)
Investment in CSI Compressco	$	6,233	$	6,233	$	—	$	—
Investment in CarbonFree	$	5,000	$	—	—		$	5,000

Investments	$	11,233

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

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