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Investments - Narratives (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
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 |

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