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Investments - Narratives (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019
Debt and Equity Securities, FV-NI
Notes receivable				$ 7,000,000.0
Investment securities, fair value	$ 6,900,000	$ 0
Realized loss on investment securities	100,000
Equity investments	$ 6,500,000	2,800,000
Liberty LNG
Debt and Equity Securities, FV-NI
Equity investments, ownership interest (percent)	25.00%
Equity investments	$ 3,300,000
Hudson Products de Mexico S.A. de CV | Investment in joint venture
Debt and Equity Securities, FV-NI
Equity investments, ownership interest (percent)	50.00%
Equity investments	$ 2,900,000	2,800,000
Earnings from equity method investment	$ 200,000	$ 600,000	$ 300,000

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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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