Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Additional Information (Details)

v3.19.1
Basis of Presentation - Additional Information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Basis Of Presentation [Line Items]      
Lease operating expenses $ 43,456,000 $ 36,843,000  
Operating lease liability 4,951,000    
Operating lease, right-of-use asset 4,951,000    
Oil and natural gas properties and equipment - full cost method, amount excluded from amortization 0   $ 0
ASU 2016-02      
Basis Of Presentation [Line Items]      
Minimum future lease payment, 2019 1,100,000    
Minimum future lease payment, 2020 1,600,000    
Minimum future lease payment, 2021 1,600,000    
Minimum future lease payment, 2022 1,600,000    
Operating lease liability 5,000,000    
Operating lease, right-of-use asset $ 5,000,000    
Operating lease, discount rate 9.75%    
Office Space | ASU 2016-02      
Basis Of Presentation [Line Items]      
Lease operating expenses $ 700,000 $ 700,000