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Investments - Narratives (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Sep. 30, 2019
Investments
Notes receivable				$ 7,000,000.0
Investment in equity securities	$ 2,100,000		$ 6,900,000
Unrealized loss on investment in equity securities	4,800,000	$ 0
Equity investments	$ 6,000,000.0		6,500,000
Liberty LNG
Investments
Equity investments, ownership interest (percent)	25.00%
Equity investments	$ 2,700,000		3,300,000
Hudson Products de Mexico S.A. de CV | Investment in Joint Venture
Investments
Equity investments, ownership interest (percent)	50.00%
Equity investments	$ 2,900,000		$ 2,900,000

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- Definition

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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The principal amount of the receivable or note before consideration of the discount or premium.

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