Derivative Instruments - Summary of Outstanding Financial Commodity Derivatives (Details) - Natural gas (NYMEX)	2 Months Ended	12 Months Ended
	Feb. 25, 2020 MMBTU $ / MMBTU	Dec. 31, 2019 MMBTU $ / MMBTU
Derivative [Line Items]
Volume (Mmbtu) | MMBTU		10,700,000
Swaps, Weighted Average Price (in dollars per Mmbtu)		2.27
Volume (Mmbtu) | MMBTU		10,700,000
Collars, Floor Price (in dollars per Mmbtu)		0
Collars, Weighted-Average Floor Price (in dollars per Mmbtu)		2.15
Collars, Weighted- Average Ceiling Price (in dollars per Mmbtu)		2.37
Minimum
Derivative [Line Items]
Collars, Ceiling Price (in dollars per Mmbtu)		2.36
Maximum
Derivative [Line Items]
Collars, Ceiling Price (in dollars per Mmbtu)		2.38
Subsequent Event
Derivative [Line Items]
Volume (Mmbtu) | MMBTU	10,700,000,000
Swaps, Weighted Average Price (in dollars per Mmbtu)	2.28
Subsequent Event
Derivative [Line Items]
Volume (Mmbtu) | MMBTU	10,700,000,000
Collars, Floor Price (in dollars per Mmbtu)	0
Collars, Weighted-Average Floor Price (in dollars per Mmbtu)	2.15
Collars, Ceiling Price (in dollars per Mmbtu)	0
Collars, Weighted- Average Ceiling Price (in dollars per Mmbtu)	2.38