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Derivative Financial Instruments (Schedule Of Open Oil Derivative Positions) (Details)	6 Months Ended
	Jun. 30, 2019 $ / bbl bbl
NYMEX West Texas Intermediate Price Swaps Oil Q3-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) | bbl	41,100
Weighted Average Price Swap	60.76
NYMEX West Texas Intermediate Price Swaps Oil Q1-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) | bbl	3,238
Weighted Average Price Swap	60.13
NYMEX West Texas Intermediate Price Collars Oil Q3-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) | bbl	79,750
Weighted Average Floor Price	54.89
Weighted Average Ceiling Price	64.92
NYMEX West Texas Intermediate Price Collars Oil Q1-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) | bbl	22,432
Weighted Average Floor Price	52.92
Weighted Average Ceiling Price	63.03
NYMEX West Texas Intermediate Three-Way Price Collars Oil Q3-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) | bbl	5,000
Weighted Average Ceiling Price	74.80
Weighted Average Floor Sold Price	50.00
Weighted Average Floor Purchased Price	63.00
Midland Sweet Basis Swaps Oil Q3-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) | bbl	28,000
Weighted Average Differential To WTI	(0.46)
Argus LLS Basis Swaps Oil Q3-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) | bbl	7,500
Weighted Average Differential To WTI	5.18
Argus MEH Basis Swaps Oil Q3-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) | bbl	26,000
Weighted Average Differential To WTI	3.33
NYMEX Roll Basis Swaps Oil Q3-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) | bbl	38,000
Weighted Average Differential To WTI	0.45
Argus MEH Basis Swaps Oil Q1-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) | bbl	9,000
Weighted Average Differential To WTI	3.44
NYMEX Roll Basis Swaps Oil Q1-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) | bbl	42,000
Weighted Average Differential To WTI	0.32

X

- Definition

Derivative weighted average floor purchased price.

+ References

No definition available.

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- Definition

Derivative weighted average floor sold price.

+ References

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- Definition

Weighted Average Differential to W T I

+ References

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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.

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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

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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.

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

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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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