Derivative Instruments and Hedging Activities (Schedule of Outstanding Oil and Natural Gas Derivative Contracts) (Details) - Forecast - Not Designated as Hedging Instrument	12 Months Ended
Dec. 31, 2020 MMBTU $ / bbl $ / MMBTU bbl	Dec. 31, 2019 MMBTU $ / bbl $ / MMBTU bbl
Oil \| Put option
Derivative [Line Items]
Total volume (MBbls) \| bbl	0	912,500
Average swap price (in dollars per share)	0.00	65.00
Oil \| Put Spreads
Derivative [Line Items]
Total volume (MBbls) \| bbl	0	912,500
Oil \| Put Spreads \| Put option \| Short
Derivative [Line Items]
Strike price (in dollars per share)	0	42.50
Oil \| Put Spreads \| Put option \| Long
Derivative [Line Items]
Strike price (in dollars per share)	0	65
Oil \| Collar contracts combined with short puts (three-way collars)
Derivative [Line Items]
Total volume (MBbls) \| bbl	0	4,564,000
Oil \| Collar contracts combined with short puts (three-way collars) \| Put option \| Short
Derivative [Line Items]
Strike price (in dollars per share)	0.00	43.60
Oil \| Collar contracts combined with short puts (three-way collars) \| Put option \| Long
Derivative [Line Items]
Strike price (in dollars per share)	0.00	56.60
Oil \| Collar contracts combined with short puts (three-way collars) \| Call option \| Short
Derivative [Line Items]
Strike price (in dollars per share)	0.00	67.62
Oil \| Swap contracts \| Oil contracts (Midland basis differential)
Derivative [Line Items]
Total volume (MBbls) \| bbl	4,024,000	4,746,500
Average swap price (in dollars per share)	1.51	4.72
Natural gas \| Collar contracts (Henry Hub, two-way collars)
Derivative [Line Items]
Total volume (BBtu) \| MMBTU	0	8,282,500
Natural gas \| Collar contracts (Henry Hub, two-way collars) \| Put option \| Long
Derivative [Line Items]
Strike price (in dollars per share) \| $ / MMBTU	0	2.91
Natural gas \| Collar contracts (Henry Hub, two-way collars) \| Call option \| Short
Derivative [Line Items]
Strike price (in dollars per share) \| $ / MMBTU	0	3.46
Natural gas \| Swap contracts \| Waha Basis Differential
Derivative [Line Items]
Strike price (in dollars per share) \| $ / MMBTU	1.12	1.23
Total volume (BBtu) \| MMBTU	4,758,000	11,321,000

- Definition

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

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Nominal volume used to calculate payments on a derivative instrument.

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- Definition

The strike price on the price risk option contract such as a put option or a call option.

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Average fixed price related to the group of price risk swap derivatives.

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