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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