Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities (Schedule of Outstanding Oil and Natural Gas Derivative Contracts) (Details)

v3.19.1
Derivative Instruments and Hedging Activities (Schedule of Outstanding Oil and Natural Gas Derivative Contracts) (Details) - Forecast - Not Designated as Hedging Instrument
 9 Months Ended 12 Months Ended
Dec. 31, 2019
MMBTU
$ / bbl
$ / MMBTU
bbl
Dec. 31, 2020
MMBTU
$ / bbl
$ / MMBTU
bbl
Oil | Put spreads    
Derivative [Line Items]    
Total volume (Bbls) | bbl 687,500 0
Oil | Collar contracts combined with short puts (three-way collars)    
Derivative [Line Items]    
Total volume (Bbls) | bbl 3,484,000 915,000
Oil | Collar contracts (two-way collars)    
Derivative [Line Items]    
Total volume (Bbls) | bbl 0 732,000
Oil | Oil contracts (Midland basis differential)    
Derivative [Line Items]    
Total volume (Bbls) | bbl 5,102,000 4,576,000
Weighted average swap price (in dollars per share) (3.95) (1.29)
Oil | Put option    
Derivative [Line Items]    
Total volume (Bbls) | bbl 687,500 0
Strike price (in dollars per share) 65 0
Oil | Put option | Put spreads | Long    
Derivative [Line Items]    
Strike price (in dollars per share) 65 0
Oil | Put option | Put spreads | Short    
Derivative [Line Items]    
Strike price (in dollars per share) 42.50 0
Oil | Put option | Collar contracts combined with short puts (three-way collars) | Long    
Derivative [Line Items]    
Strike price (in dollars per share) 56.58 55
Oil | Put option | Collar contracts combined with short puts (three-way collars) | Short    
Derivative [Line Items]    
Strike price (in dollars per share) 43.62 45
Oil | Put option | Collar contracts (two-way collars) | Long    
Derivative [Line Items]    
Strike price (in dollars per share) 0 55
Oil | Call option | Collar contracts combined with short puts (three-way collars) | Short    
Derivative [Line Items]    
Strike price (in dollars per share) 67.56 65.02
Oil | Call option | Collar contracts (two-way collars) | Short    
Derivative [Line Items]    
Strike price (in dollars per share) 0 64.63
Natural gas | Swap contracts    
Derivative [Line Items]    
Strike price (in dollars per share) | $ / MMBTU 2.88 0
Total volume (MMBtu) | MMBTU 1,852,000 0
Natural gas | Collar contracts (two-way collars)    
Derivative [Line Items]    
Total volume (MMBtu) | MMBTU 2,697,500 0
Natural gas | Collar contracts (two-way collars) | Long    
Derivative [Line Items]    
Strike price (in dollars per share) | $ / MMBTU 3.09 0
Natural gas | Collar contracts (two-way collars) | Short    
Derivative [Line Items]    
Strike price (in dollars per share) | $ / MMBTU 3.68 0
Natural gas | Waha basis differential | Swap contracts    
Derivative [Line Items]    
Total volume (MMBtu) | MMBTU 5,961,000 4,758,000
Weighted average swap price (in dollars per share) | $ / MMBTU (1.19) (1.12)