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Investment in Laramie Energy, LLC - Summarized Financial Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
ASSETS          
Current assets $ 590,323   $ 590,323   $ 603,544
Current liabilities 488,587   488,587   470,952
REVENUE          
Income (loss) from operations 4,894 $ 26,716 61,533 $ 72,356  
Net income (5,822) 18,824 25,541 53,616  
Laramie Energy Company          
ASSETS          
Current assets 18,910   18,910   18,757
Non-current assets 796,316   796,316   720,444
Current liabilities 37,187   37,187   42,149
Non-current liabilities 288,965   288,965   $ 237,497
REVENUE          
Natural gas and oil revenues 58,557 38,141 151,988 114,178  
Income (loss) from operations 6,152 133 11,642 (162)  
Net income $ (152) $ (1,838) $ (1,708) $ 18,102