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Investment in Laramie Energy, LLC - Change in Equity Investment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |
Equity losses from Laramie Energy, LLC | $ 0 | $ (46,905) | $ (89,751)
Laramie Energy Company |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |
Beginning balance | $ 0 | 46,905 | 136,656
Equity losses from Laramie Energy, LLC |  | (1,611) | (175,018)
Accretion of basis difference |  | 0 | 5,018
Adjustment of basis difference |  | 0 | 161,764
Impairment of our investment in Laramie Energy |  | (45,294) | (81,515)
Ending balance |  | $ 0 | $ 46,905

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