Derivative Instruments and Hedging Activities (Schedule of Outstanding Oil and Natural Gas Derivative Contracts) (Details) - Forecast - Not Designated as Hedging Instrument	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2021 bbl	Jun. 30, 2021 bbl	Sep. 30, 2021 bbl	Dec. 31, 2021 MMBTU $ / MMBTU $ / bbl bbl
Commodity - Oil | Swap contracts
Derivative [Line Items]
Total volume (Bbls) | bbl				1,827,000
Weighted average price (in dollars per share)				43.54
Commodity - Oil | Short
Derivative [Line Items]
Total volume (Bbls) | bbl				4,825,300
Weighted average price (in dollars per share)				63.62
Commodity - Oil | Short | Swap contracts | Call option
Derivative [Line Items]
Total volume (Bbls) | bbl	455,000	460,000	460,000	1,375,000
Weighted average price (in dollars per share)				49.01
Commodity - Oil | Collar contracts (Brent ICE)
Derivative [Line Items]
Total volume (Bbls) | bbl				730,000
Commodity - Oil | Collar contracts (Brent ICE) | Short | Call option
Derivative [Line Items]
Weighted average price (in dollars per share) | $ / bbl				50.00
Commodity - Oil | Collar contracts (Brent ICE) | Long | Put option
Derivative [Line Items]
Weighted average price (in dollars per share) | $ / bbl				45.00
Commodity - Oil | Collar contracts (WTI)
Derivative [Line Items]
Total volume (Bbls) | bbl				10,282,775
Commodity - Oil | Collar contracts (WTI) | Short | Call option
Derivative [Line Items]
Weighted average price (in dollars per share) | $ / bbl				46.69
Commodity - Oil | Collar contracts (WTI) | Long | Put option
Derivative [Line Items]
Weighted average price (in dollars per share) | $ / bbl				39.28
Commodity - Oil | Oil contracts (Brent ICE) | Swap contracts
Derivative [Line Items]
Total volume (Bbls) | bbl				848,300
Weighted average price (in dollars per share) | $ / bbl				37.36
Commodity - Oil | Oil contracts (Midland basis differential)
Derivative [Line Items]
Total volume (Bbls) | bbl				3,022,900
Weighted average price (in dollars per share) | $ / bbl				(0.26)
Commodity - Oil | Oil contracts (Argus Houston MEH swaps) | Swap contracts
Derivative [Line Items]
Total volume (Bbls) | bbl				450,000
Weighted average price (in dollars per share)				46.50
Commodity - Oil | Collar contracts (Argus Houston MEH)
Derivative [Line Items]
Total volume (Bbls) | bbl				409,500
Commodity - Oil | Collar contracts (Argus Houston MEH) | Short | Call option
Derivative [Line Items]
Weighted average price (in dollars per share) | $ / bbl				47.00
Commodity - Oil | Collar contracts (Argus Houston MEH) | Long | Put option
Derivative [Line Items]
Weighted average price (in dollars per share) | $ / bbl				41.00
Commodity - Natural gas | Swap contracts
Derivative [Line Items]
Weighted average price (in dollars per share)				2.60
Total volume (MMBtu) | MMBTU				11,123,000
Commodity - Natural gas | Swap contracts | Call option
Derivative [Line Items]
Weighted average price (in dollars per share)				3.09
Total volume (MMBtu) | MMBTU				7,300,000
Commodity - Natural gas | Collar contracts (three-way collars)
Derivative [Line Items]
Total volume (MMBtu) | MMBTU				1,350,000
Commodity - Natural gas | Collar contracts (three-way collars) | Short | Call option
Derivative [Line Items]
Weighted average price (in dollars per share)				2.70
Commodity - Natural gas | Collar contracts (three-way collars) | Short | Put option
Derivative [Line Items]
Weighted average price (in dollars per share)				2.00
Commodity - Natural gas | Collar contracts (three-way collars) | Long
Derivative [Line Items]
Weighted average price (in dollars per share)				2.42
Commodity - Natural gas | Collar contracts (two-way collars)
Derivative [Line Items]
Total volume (MMBtu) | MMBTU				9,550,000
Commodity - Natural gas | Collar contracts (two-way collars) | Short | Call option
Derivative [Line Items]
Weighted average price (in dollars per share)				3.04
Commodity - Natural gas | Collar contracts (two-way collars) | Long | Put option
Derivative [Line Items]
Weighted average price (in dollars per share)				2.59
Commodity - Natural gas | Waha basis differential | Swap contracts
Derivative [Line Items]
Total volume (MMBtu) | MMBTU				16,425,000
Weighted average price (in dollars per share)				(0.42)
Natural gas liquids | NGL contracts (OPIS Mont Belvieu Purity Ethane) | Swap contracts
Derivative [Line Items]
Total volume (Bbls) | bbl				1,825,000
Weighted average price (in dollars per share)				7.62