Derivative Financial Instruments (Schedule Of Open Oil Derivative Positions) (Details)	3 Months Ended
Mar. 31, 2015 bbl
NYMEX West Texas Intermediate Price Swaps Oil Q2-Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d)	106,442
Weighted Average Price Swap	91.07
NYMEX West Texas Intermediate Price Collars Oil Q2-Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d)	31,500
Weighted Average Floor Price	89.67
Weighted Average Ceiling Price	97.84
NYMEX West Texas Intermediate Call Options Sold Oil Q2-Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d)	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)
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)
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)	18,500
Weighted Average Call Option Sold Price	103.11
Western Canadian Select Basis Swaps Oil Q2-Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d)	36,320
Weighted Average Differential To WTI	(16.35)
West Texas Sour Basis Swaps Oil Q2-Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d)	8,000
Weighted Average Differential To WTI	(3.68)
Midland Sweet Basis Swaps Oil Q2- Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d)	16,331
Weighted Average Differential To WTI	(2.84)
West Texas Sour Basis Swaps Oil Q1-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (Bbls/d)	1,000
Weighted Average Differential To WTI	(1.50)

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

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

+ 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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- 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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