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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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