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Investments - Narratives (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Sep. 30, 2019
Debt and Equity Securities, FV-NI [Line Items]
Notes receivable						$ 7,000,000.0
Investment in equity securities	$ 3,100,000		$ 3,100,000		$ 6,900,000
Gain (loss) on equity investments	1,000,000.0	$ 0	(3,800,000)	$ 0
Equity investments	6,200,000		6,200,000		6,500,000
Liberty LNG
Debt and Equity Securities, FV-NI [Line Items]
Equity investments, ownership interest (percent)						25.00%
Equity investments	$ 2,600,000		$ 2,600,000		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	$ 3,200,000		$ 3,200,000		$ 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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