Derivative Financial Instruments (Schedule Of Open Oil Derivative Positions) (Details)	9 Months Ended
Sep. 30, 2016 $ / bbl bbl
NYMEX West Texas Intermediate Price Swaps Oil Q4 2016 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	40,848
Weighted Average Price Swap	49.00
NYMEX West Texas Intermediate Price Swaps Oil Q1-Q4 2017 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	10,452
Weighted Average Price Swap	50.57
NYMEX West Texas Intermediate Price Swaps Oil Q1-Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	616
Weighted Average Price Swap	50.61
NYMEX West Texas Intermediate Price Collars Oil Q4 2016 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	20,000
Weighted Average Floor Price	40.85
Weighted Average Ceiling Price	50.85
NYMEX West Texas Intermediate Price Collars Oil Q1-Q4 2017 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	32,496
Weighted Average Floor Price	44.60
Weighted Average Ceiling Price	57.37
NYMEX West Texas Intermediate Price Collars Oil Q1-Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	1,726
Weighted Average Floor Price	45.51
Weighted Average Ceiling Price	55.51
NYMEX West Texas Intermediate Call Options Sold Oil Q4 2016 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	18,500
Weighted Average Call Option Sold Price	55.00
Western Canadian Select Basis Swaps Oil Q4 2016 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	33,000
Weighted Average Differential To WTI	(13.40)
West Texas Sour Basis Swaps Oil Q4 2016 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	5,000
Weighted Average Differential To WTI	(0.53)
Midland Sweet Basis Swaps Oil Q4 2016 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) \| bbl	13,000
Weighted Average Differential To WTI	0.25

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

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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- Details

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- Details

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