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, 2020 MMBTU $ / bbl $ / MMBTU bbl	Dec. 31, 2021 MMBTU $ / bbl $ / MMBTU bbl
Commodity - Oil | Short
Derivative [Line Items]
Total volume (Bbls) | bbl	2,750,000	4,825,300
Weighted average price (in dollars per share)	45.59	63.62
Commodity - Oil | Put spreads
Derivative [Line Items]
Weighted average price (in dollars per share) | $ / bbl	56.06	0
Commodity - Oil | Put spreads | Put option | Short
Derivative [Line Items]
Total volume (Bbls) | bbl	1,650,000	0
Weighted average price (in dollars per share) | $ / bbl	42.50	0
Commodity - Oil | Collar contracts with short puts (Brent ICE, three-way collars)
Derivative [Line Items]
Total volume (Bbls) | bbl	366,000	0
Weighted average price (in dollars per share) | $ / bbl	46.15	0
Commodity - Oil | Oil contracts (Midland basis differential)
Derivative [Line Items]
Total volume (Bbls) | bbl	6,574,800	4,015,100
Weighted average price (in dollars per share) | $ / bbl		0.40
Weighted average price (in dollars per share) | $ / bbl	(1.24)
Commodity - Oil | Oil contracts (Argus Houston MEH basis differential)
Derivative [Line Items]
Total volume (Bbls) | bbl	4,612,205	0
Weighted average price (in dollars per share) | $ / bbl	(0.24)	0
Commodity - Oil | Oil contracts (Argus Houston MEH swaps)
Derivative [Line Items]
Total volume (Bbls) | bbl	504,500	0
Weighted average price (in dollars per share)	58.22	0
Commodity - Oil | Swap contracts
Derivative [Line Items]
Total volume (Bbls) | bbl	13,085,720	0
Weighted average price (in dollars per share)	42.11	0
Commodity - Natural gas | Call option | Short
Derivative [Line Items]
Weighted average price (in dollars per share)	3.50	3.09
Total volume (MMBtu) | MMBTU	9,075,000	7,300,000
Commodity - Natural gas | Collar contracts (three-way collars)
Derivative [Line Items]
Total volume (MMBtu) | MMBTU	3,665,000	1,350,000
Commodity - Natural gas | Collar contracts (three-way collars) | Long
Derivative [Line Items]
Weighted average price (in dollars per share)	2.48	2.42
Commodity - Natural gas | Collar contracts (three-way collars) | Put option | Short
Derivative [Line Items]
Weighted average price (in dollars per share)	2.00	2.00
Commodity - Natural gas | Collar contracts (three-way collars) | Call option | Short
Derivative [Line Items]
Weighted average price (in dollars per share)	2.74	2.70
Commodity - Natural gas | Swap contracts
Derivative [Line Items]
Weighted average price (in dollars per share)	2.20	0
Total volume (MMBtu) | MMBTU	9,170,000	0
Commodity - Natural gas | Swap contracts | Waha basis differential
Derivative [Line Items]
Total volume (MMBtu) | MMBTU	18,982,000	0
Weighted average price (in dollars per share)	(1.08)	0