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Investment in Laramie Energy, LLC - Summarized Financial Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
ASSETS          
Current assets $ 637,629   $ 637,629   $ 603,544
Current liabilities 531,927   531,927   470,952
REVENUE          
Income (loss) from operations 28,983 $ 16,451 56,639 $ 45,640  
Net income 16,178 7,006 31,363 34,792  
Laramie Energy Company          
ASSETS          
Current assets 19,114   19,114   18,757
Non-current assets 791,699   791,699   720,444
Current liabilities 39,679   39,679   42,149
Non-current liabilities 281,980   281,980   $ 237,497
REVENUE          
Natural gas and oil revenues 46,750 35,425 93,431 76,037  
Income (loss) from operations (554) (1,458) 5,490 (295)  
Net income $ (8,846) $ 2,412 $ (1,556) $ 19,940