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Information Regarding Proved Oil and Gas Reserves (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]        
Beginning of the period $ 141,427 $ 39,797 $ 162,437  
Sales of oil and gas production during the period, net of production costs (29,939) (8,041) (6,232)  
Acquisitions and divestitures   81,066 (4,789)  
Net change in prices and production costs 35,537 2,974 (154,243)  
Changes in estimated future development costs   (8,561) 796  
Extensions, discoveries and improved recovery   231 9,273  
Revisions of previous quantity estimates, estimated timing of development and other 38,038 17,137 310  
Previously estimated development and abandonment costs incurred during the period 17,187 12,805 15,008  
Accretion of discount 14,143 4,019 17,237  
End of period 216,393 141,427 39,797 $ 162,437
Company        
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]        
Beginning of the period 285 192 1,766  
Sales of oil and gas production during the period, net of production costs (28) (62) (479)  
Acquisitions and divestitures   0 0  
Net change in prices and production costs (60) (20) (679)  
Changes in estimated future development costs   14 8  
Extensions, discoveries and improved recovery   0 0  
Revisions of previous quantity estimates, estimated timing of development and other 346 142 (601)  
Previously estimated development and abandonment costs incurred during the period 0 0 0  
Accretion of discount 29 19 177  
End of period 572 285 192 1,766
Company's Share of Laramie Energy        
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]        
Beginning of the period 141,142 39,605 160,671  
Sales of oil and gas production during the period, net of production costs (29,911) (7,979) (5,753)  
Acquisitions and divestitures   81,066 (4,789)  
Net change in prices and production costs 35,597 2,994 (153,564)  
Changes in estimated future development costs   (8,575) 788  
Extensions, discoveries and improved recovery   231 9,273  
Revisions of previous quantity estimates, estimated timing of development and other 37,692 16,995 911  
Previously estimated development and abandonment costs incurred during the period 17,187 12,805 15,008  
Accretion of discount 14,114 4,000 17,060  
End of period $ 215,821 141,142 39,605 160,671
Restatement Adjustment | Company        
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]        
Revisions of previous quantity estimates, estimated timing of development and other   $ 1,800 $ 400 $ 9,900
Revisions of previous quantity estimates, percentage   1.00% 1.00% 6.00%