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Investments - Narratives (Details) - USD ($)	3 Months Ended		9 Months Ended
Investments - Narratives (Details) - USD ($)	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Investments
Notes receivable	$ 7,000,000.0		$ 7,000,000.0
Investment securities, fair value	9,600,000		9,600,000
Realized gain on investment securities	2,600,000
Equity investments	$ 6,300,000		$ 6,300,000		$ 2,800,000
Liberty LNG
Investments
Equity investments, ownership interest (percent)	25.00%		25.00%
Equity investments	$ 3,300,000		$ 3,300,000
Hudson Products de Mexico S.A. de CV \| Investment in Joint Venture
Investments
Equity investments, ownership interest (percent)	50.00%		50.00%
Equity investments	$ 3,000,000.0		$ 3,000,000.0		$ 3,000,000
Earnings from equity method investment	$ 0.3	$ 300,000	$ 300,000	$ 300,000