Derivative Financial Instruments (Gas Derivative Contracts Volume And Weighted Average Price) (Details)	Dec. 31, 2020 MMBTU / d $ / MMBTU
Basis swap contracts for next year Q1 \| Gas contracts, in MMBTU \| Permian Basin
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	10,000
Basis swap contracts for next year Q1 \| Gas contracts, price per MMBTU \| Permian Basin
Derivative [Line Items]
Price differential, dollars per barrel	(1.46)
Basis swap contracts for next year Q2 \| Gas contracts, in MMBTU \| Permian Basin
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	0
Basis swap contracts for next year Q2 \| Gas contracts, price per MMBTU \| Permian Basin
Derivative [Line Items]
Price differential, dollars per barrel	0
Basis swap contracts for next year Q3 \| Gas contracts, in MMBTU \| Permian Basin
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	0
Basis swap contracts for next year Q3 \| Gas contracts, price per MMBTU \| Permian Basin
Derivative [Line Items]
Price differential, dollars per barrel	0
Basis swap contracts for next year Q4 [Member] \| Gas contracts, in MMBTU \| Permian Basin
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	0
Basis swap contracts for next year Q4 [Member] \| Gas contracts, price per MMBTU \| Permian Basin
Derivative [Line Items]
Price differential, dollars per barrel	0
Swap Contracts For First Quarter of Year One [Member] \| Gas contracts, in MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	127,222
Swap Contracts For First Quarter of Year One [Member] \| Gas contracts, price per MMBTU
Derivative [Line Items]
Price per MMBtu in usd	2.66
Swap Contracts For Second Quarter of Year One [Member] \| Gas contracts, in MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	100,000
Swap Contracts For Second Quarter of Year One [Member] \| Gas contracts, price per MMBTU
Derivative [Line Items]
Price per MMBtu in usd	2.68
Swap Contracts For Third Quarter of Year One [Member] \| Gas contracts, in MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	100,000
Swap Contracts For Third Quarter of Year One [Member] \| Gas contracts, price per MMBTU
Derivative [Line Items]
Price per MMBtu in usd	2.68
Swap contracts for next year Q4 \| Gas contracts, in MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	100,000
Swap contracts for next year Q4 \| Gas contracts, price per MMBTU
Derivative [Line Items]
Price per MMBtu in usd	2.68
Permian collar contracts for Next Year Q1 [Member] \| Gas contracts, in MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	150,000
Permian collar contracts for Next Year Q1 [Member] \| Gas contracts, price per MMBTU
Derivative [Line Items]
Ceiling, price per barrel	3.15
Floor, price per barrel	2.50
Permian collar contracts for Next Year Q2 [Member] \| Gas contracts, in MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	150,000
Permian collar contracts for Next Year Q2 [Member] \| Gas contracts, price per MMBTU
Derivative [Line Items]
Ceiling, price per barrel	3.15
Floor, price per barrel	2.50
Permian collar contracts for Next Year Q3 [Member] \| Gas contracts, in MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	150,000
Permian collar contracts for Next Year Q3 [Member] \| Gas contracts, price per MMBTU
Derivative [Line Items]
Ceiling, price per barrel	3.15
Floor, price per barrel	2.50
Permian collar contracts for Next Year Q4 [Member] \| Gas contracts, in MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	150,000
Permian collar contracts for Next Year Q4 [Member] \| Gas contracts, price per MMBTU
Derivative [Line Items]
Ceiling, price per barrel	3.15
Floor, price per barrel	2.50
ICE DUTCH Swap Contracts for the first quarter of Year One [Member] \| Gas contracts, in MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	30,000
ICE DUTCH Swap Contracts for the first quarter of Year One [Member] \| Gas contracts, price per MMBTU
Derivative [Line Items]
Price per MMBtu in usd	5.07
ICE DUTCH Swap Contracts for the Second quarter of Year One [Member] \| Gas contracts, in MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	30,000
ICE DUTCH Swap Contracts for the Second quarter of Year One [Member] \| Gas contracts, price per MMBTU
Derivative [Line Items]
Price per MMBtu in usd	5.07
ICE DUTCH Swap Contracts for the third quarter of Year One [Member] \| Gas contracts, in MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	30,000
ICE DUTCH Swap Contracts for the third quarter of Year One [Member] \| Gas contracts, price per MMBTU
Derivative [Line Items]
Price per MMBtu in usd	5.07
ICE DUTCH Swap Contracts for the Fourth quarter of Year One [Member] \| Gas contracts, in MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMBTU / d	30,000
ICE DUTCH Swap Contracts for the Fourth quarter of Year One [Member] \| Gas contracts, price per MMBTU
Derivative [Line Items]
Price per MMBtu in usd	5.07

Derivative, Swap Type, Price Differential

No definition available.

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- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

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- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

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- Definition

The average forward price on the group of price risk forward or futures contracts, such as gas futures contracts.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

+ Details

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