Quarterly report pursuant to Section 13 or 15(d)

Joint Venture Drilling Program - Additional Information (Details)

v3.19.1
Joint Venture Drilling Program - Additional Information (Details)
 3 Months Ended 12 Months Ended
Mar. 12, 2018
USD ($)
DrillingProject
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Oil And Gas In Process Activities [Line Items]          
Oil and natural gas properties   $ 514,765,000 $ 515,421,000   $ 515,421,000
Other assets   79,005,000 91,547,000   91,547,000
Total revenues   116,080,000   $ 134,213,000  
Advances from joint interest partners   65,271,000 20,627,000   20,627,000
Monza Energy LLC          
Oil And Gas In Process Activities [Line Items]          
Oil and natural gas properties   11,000,000 8,800,000   8,800,000
Other assets   3,300,000 3,300,000   3,300,000
Increase in working capital   5,000,000     $ 700,000
Total revenues   1,600,000 0    
Operating cots and expense   900,000      
Operating expense     $ 0    
Cash calls received   66,300,000      
Advances from joint interest partners   $ 65,200,000      
JV Drilling Program | Mr. Tracy W. Krohn          
Oil And Gas In Process Activities [Line Items]          
Minority interest ownership percentage by joint venture   4.50%      
JV Drilling Program | Monza Energy LLC          
Oil And Gas In Process Activities [Line Items]          
Joint venture ownership percentage contributed to related party 88.94%        
Joint venture ownership percentage 11.06%        
Commitment amount by investors $ 361,400,000        
Percentage of revenue less expenses from joint venture 30.00%        
Percentage of estimated well cost 20.00%        
Capital contribution payments from members of Monza   $ 184,900,000      
Capital contribution payments from members of Monza during period   70,200,000      
Contributions, net of distributions, paid to related party   58,900,000      
JV Drilling Program | Monza Energy LLC | Mr. Tracy W. Krohn          
Oil And Gas In Process Activities [Line Items]          
Capital commitment   $ 14,500,000      
JV Drilling Program | Monza Energy LLC | Maximum          
Oil And Gas In Process Activities [Line Items]          
Number of drilling projects | DrillingProject 14