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Investments - Narratives (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]
Investment in equity securities	$ 3,800,000		$ 3,800,000		$ 6,900,000
Gain (loss) on equity investments	700,000	$ 2,600,000	(3,200,000)	$ 2,600,000
Equity investments	5,900,000		5,900,000		6,500,000
Stabilis Energy, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Notes receivable		$ 7,000,000.0		$ 7,000,000.0
Investment in equity securities	3,800,000		3,800,000
Gain (loss) on equity investments	700,000		(3,100,000)
Liberty LNG
Debt and Equity Securities, FV-NI [Line Items]
Equity investments, ownership interest (percent)		25.00%		25.00%
Equity investments	$ 2,300,000		$ 2,300,000		3,300,000
Hudson Products de Mexico S.A. de CV | Investment in Joint Venture
Debt and Equity Securities, FV-NI [Line Items]
Equity investments, ownership interest (percent)	50.00%		50.00%
Equity investments	$ 3,300,000		$ 3,300,000		$ 2,900,000

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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