Derivative Financial Instruments (Schedule Of Open Oil Derivative Positions) (Details)	12 Months Ended
Dec. 31, 2019 $ / bbl bbl
NYMEX West Texas Intermediate Price Swaps Oil Q1-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	11,238
Weighted Average Price Swap	57.68
NYMEX West Texas Intermediate Price Swaps Oil Q1-Q4 2021 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	989
Weighted Average Price Swap	54.81
NYMEX West Texas Intermediate Price Collars Oil Q1-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	44,932
Weighted Average Floor Price	51.30
Weighted Average Ceiling Price	61.36
NYMEX West Texas Intermediate Price Collars Oil Q1-Q4 2021 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	5,942
Weighted Average Floor Price	49.59
Weighted Average Ceiling Price	59.59
Argus MEH Basis Swaps Oil Q1-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	10,000
Weighted Average Differential To WTI	3.38
NYMEX Roll Basis Swaps Oil Q1-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	50,000
Weighted Average Differential To WTI	0.36

Weighted average differential to W T I.

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

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 volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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