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Investment in Laramie Energy, LLC - Change in Equity Investment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |
Equity losses from Laramie Energy | $ (85,633) | $ 1,050 | $ (84,841) | $ 4,274
Laramie Energy Company |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 136,656 |
Equity losses from Laramie Energy |  |  | (8,344) |
Accretion of basis difference |  |  | 5,018 |
Impairment | (81,500) |  | (81,515) |
Ending balance | $ 51,815 |  | $ 51,815 |

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