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Investment in Laramie Energy, LLC - Change in Equity Investment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance $ 127,192  
Equity earnings from Laramie Energy 5,576 $ 8,746
Ending balance 132,768  
Laramie Energy Company    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance 127,192  
Equity earnings from Laramie Energy 4,303  
Accretion of basis difference 1,273  
Ending balance $ 132,768