Quarterly report pursuant to Section 13 or 15(d)

Property and equipment, net - Narrative (Details)

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Property and equipment, net - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Property, Plant and Equipment [Abstract]      
Impairment of oil and natural gas properties $ 333,840,000 $ 0  
Impairment of lease and loss on acreage 12,800,000    
Capitalized costs included in proved oil and natural gas properties not subject to DD&A $ 24,800,000   $ 19,900,000