Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities (Subsequent Events) (Details)

v3.10.0.1
Derivative Instruments and Hedging Activities (Subsequent Events) (Details) - Not Designated as Hedging Instrument - Forecast - Natural gas
3 Months Ended 12 Months Ended
Dec. 31, 2018
MMBTU
$ / MMBTU
Dec. 31, 2020
MMBTU
$ / MMBTU
Dec. 31, 2019
MMBTU
$ / MMBTU
Collar contracts (two-way collars), Subsequent Contracts      
Derivative [Line Items]      
Total volume (MMBtu) | MMBTU 0 0 1,355,000
Collar contracts (two-way collars), Subsequent Contracts | Short      
Derivative [Line Items]      
Strike price (in dollars per share) 0 0 3.45
Collar contracts (two-way collars), Subsequent Contracts | Long      
Derivative [Line Items]      
Strike price (in dollars per share) 0 0 2.83
Waha Basis Differential, Subsequent Contracts | Swap contracts      
Derivative [Line Items]      
Total volume (MMBtu) | MMBTU 0 0 3,650,000
Weighted average swap price (in dollars per share) 0 0 (1.30)