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Derivative Financial Instruments (Schedule Of Open Oil Derivative Positions) (Details)	9 Months Ended
	Sep. 30, 2021 $ / bbl bbl
NYMEX West Texas Intermediate Price Swaps Oil Q4 2021 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	66,460
Weighted Average Price Swap	41.24
NYMEX West Texas Intermediate Price Swaps Oil Q1-Q4 2022 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	26,112
Weighted Average Price Swap	43.75
NYMEX West Texas Intermediate Price Swaptions Oil Q1-Q4 2022 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	10,000
Weighted Average Price Swap	46.67
NYMEX West Texas Intermediate Price Collars Oil Q4 2021 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	48,250
Weighted Average Floor Price	38.82
Weighted Average Ceiling Price	48.82
NYMEX West Texas Intermediate Price Collars Oil Q1-Q4 2022 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	20,233
Weighted Average Floor Price	46.41
Weighted Average Ceiling Price	56.41
NYMEX West Texas Intermediate Call Options Sold Oil Q4 2021 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	5,000
Weighted Average Price Swap	39.50
Midland Sweet Basis Swaps Oil Q4 2021 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	23,000
Oil Basis Swaps	0.84
BRENT Basis Swaps Oil Q1-Q4 2022 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	1,000
Oil Basis Swaps	(7.75)
Guernsey Light Basis Sweet Basic Swaps Oil Q4 2021 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	4,000
Oil Basis Swaps	(1.49)
NYMEX Roll Basis Swaps Oil Q1-Q4 2022 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	29,000
Oil Basis Swaps	0.45
BRENT Basis Swaps Oil Q4 2021 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	1,000
Oil Basis Swaps	(8.00)
NYMEX Roll Basis Swaps Oil Q4 2021 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	13,000
Oil Basis Swaps	0.39

X

- Definition

Weighted average differential to W T I.

+ References

No definition available.

+ Details

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X

- 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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X

- 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.

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Details

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