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Investments - Narratives (Details) € in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 CAD ($) shares | Dec. 31, 2020 EUR (€) shares | Sep. 30, 2019 USD ($)
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Investment in equity securities | $ 73,600,000 | $ 6,900,000 |  |  |  |
Equity investments | 5,300,000 | 6,500,000 |  |  |  |
Stabilis Energy, Inc. |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Notes receivable |  |  |  |  |  | $ 7,000,000.0
Investment in equity securities | 4,100,000 | 6,900,000 |  |  |  |
Unrealized loss | $ 2,900,000 | 100,000 |  |  |  |
Investment in joint venture | Hudson Products de Mexico S.A. de CV |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Equity investments, ownership interest (percent) | 50.00% |  |  | 50.00% | 50.00% |
Equity investments | $ 2,800,000 | 2,900,000 |  |  |  |
Earnings (loss) from equity method investment | 300,000 | 200,000 | $ 600,000 |  |  |
Liberty LNG |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Equity investments, ownership interest (percent) |  |  |  |  |  | 25.00%
Equity investments | 2,100,000 | 3,300,000 |  |  |  |
Earnings (loss) from equity method investment | (1,000,000.0) | $ 0 |  |  |  |
McPhy |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Value of investment | $ 53,800,000 |  |  |  |  |
McPhy |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Shares owned (shares) | shares | 1,276,595 |  |  | 1,276,595 | 1,276,595 |
Value of investment | $ 35,100,000 |  |  |  | € 30 |
Ownership percentage | 4.60% |  |  | 4.60% | 4.60% |
Unrealized gain | $ 17,000,000.0 |  |  |  |  |
HTEC |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Value of investment | $ 15,700,000 |  |  | $ 20 |  |
Ownership percentage | 15.60% |  |  | 15.60% | 15.60% |

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