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Oil and Gas Reserve Information - Discounted Net Cash Flows (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]      
Beginning of the period $ 319,232 $ 216,393 $ 141,427
Sales of oil and gas production during the period, net of production costs (59,148) (47,292) (29,939)
Acquisitions and divestitures (143) 35,182  
Net change in prices and production costs (114,219) (1,345) 35,537
Revisions of previous quantity estimates, estimated timing of development and other (64,073) 53,919 38,038
Previously estimated development and abandonment costs incurred during the period 26,444 40,736 17,187
Accretion of discount 31,923 21,639 14,143
End of period 140,016 319,232 216,393
Company      
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]      
Beginning of the period 130 572 285
Sales of oil and gas production during the period, net of production costs (55) (127) (28)
Acquisitions and divestitures (143) 0  
Net change in prices and production costs (24) 20 (60)
Revisions of previous quantity estimates, estimated timing of development and other 260 (392) 346
Previously estimated development and abandonment costs incurred during the period 0 0 0
Accretion of discount 13 57 29
End of period 181 130 572
Company's Share of Laramie Energy      
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]      
Beginning of the period 319,102 215,821 141,142
Sales of oil and gas production during the period, net of production costs (59,093) (47,165) (29,911)
Acquisitions and divestitures 0 35,182  
Net change in prices and production costs (114,195) (1,365) 35,597
Revisions of previous quantity estimates, estimated timing of development and other (64,333) 54,311 37,692
Previously estimated development and abandonment costs incurred during the period 26,444 40,736 17,187
Accretion of discount 31,910 21,582 14,114
End of period $ 139,835 $ 319,102 $ 215,821