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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance     $ 127,192  
Equity earnings from Laramie Energy $ 1,050 $ 553 4,274 $ 11,651
Ending balance 131,466   131,466  
Laramie Energy Company        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance     127,192  
Equity earnings from Laramie Energy     782  
Accretion of basis difference     3,492  
Ending balance $ 131,466   $ 131,466