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Derivative Financial Instruments (Schedule Of Open Oil Derivative Positions) (Details)	9 Months Ended
	Sep. 30, 2015 $ / bbl bbl
NYMEX West Texas Intermediate Price Swaps Oil Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	107,000
Weighted Average Price Swap	90.61
NYMEX West Texas Intermediate Price Collars Oil Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	44,000
Weighted Average Floor Price	81.36
Weighted Average Ceiling Price	88.63
NYMEX West Texas Intermediate Call Options Sold Oil Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	28,000
Weighted Average Call Option Sold Price	116.43
NYMEX West Texas Intermediate Price Swaps Oil Q1-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl
Weighted Average Price Swap
NYMEX West Texas Intermediate Price Collars Oil Q1-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl
Weighted Average Floor Price
Weighted Average Ceiling Price
NYMEX West Texas Intermediate Call Options Sold Oil Q1-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	18,500
Weighted Average Call Option Sold Price	89.05
Western Canadian Select Basis Swaps Oil Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	40,000
Weighted Average Differential To WTI	(15.58)
West Texas Sour Basis Swaps Oil Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	8,000
Weighted Average Differential To WTI	(3.68)
Midland Sweet Basis Swaps Oil Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	16,000
Weighted Average Differential To WTI	(2.86)
West Texas Sour Basis Swaps Oil Q1-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	5,000
Weighted Average Differential To WTI	(0.53)
Midland Sweet Basis Swaps Oil Q1-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d) | bbl	13,000
Weighted Average Differential To WTI	0.25

X

- Definition

Weighted Average Differential to W T I

+ References

No definition available.

+ Details

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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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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

The average strike price on the group of price risk option contracts such as put options or call options.

+ 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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- Definition

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

+ References

No definition available.

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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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