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Investment in Laramie Energy, LLC - Summarized Financial Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
ASSETS      
Current assets $ 588,227   $ 603,544
Current liabilities 509,180   470,952
REVENUE      
Income from operations 27,656 $ 29,189  
Net income 15,185 27,786  
Laramie Energy Company      
ASSETS      
Current assets 23,626   18,757
Non-current assets 776,181   720,444
Current liabilities 33,218   42,149
Non-current liabilities 270,150   $ 237,497
REVENUE      
Natural gas and oil revenues 46,681 40,612  
Income from operations 6,044 1,163  
Net income $ 7,290 $ 17,528