Derivative Instruments - Outstanding Commodity Derivatives (Details) - Natural gas (NYMEX)	1 Months Ended	3 Months Ended
	Apr. 30, 2020 MMBTU $ / MMBTU	Mar. 31, 2020 MMBTU $ / MMBTU
Derivative [Line Items]
Volume (in Mmbtu) | MMBTU		21,400,000
Swaps Weighted-Average (in usd per Mmbtu)		2.27
Volume (in Mmbtu) | MMBTU		21,400,000
Floor, Range (in usd per Mmbtu)		0
Floor, Weighted-Average (in usd per Mmbtu)		2.15
Ceiling, Weighted-Average (in usd per Mmbtu)		2.38
Swaps Weighted-Average (in usd per Mmbtu)
Minimum
Derivative [Line Items]
Ceiling, Range (in usd per Mmbtu)		2.36
Maximum
Derivative [Line Items]
Ceiling, Range (in usd per Mmbtu)		2.38
Subsequent Event
Derivative [Line Items]
Volume (in Mmbtu) | MMBTU	73,600,000
Floor, Weighted-Average (in usd per Mmbtu)	2.02
Ceiling, Weighted-Average (in usd per Mmbtu)	2.20
Minimum | Subsequent Event
Derivative [Line Items]
Floor, Range (in usd per Mmbtu)	1.90
Ceiling, Range (in usd per Mmbtu)	2.10
Maximum | Subsequent Event
Derivative [Line Items]
Floor, Range (in usd per Mmbtu)	2.15
Ceiling, Range (in usd per Mmbtu)	2.32
Subsequent Event
Derivative [Line Items]
Volume (in Mmbtu) | MMBTU	18,400,000
Swaps Weighted-Average (in usd per Mmbtu)	2.10