Derivative Financial Instruments (Schedule Of Oil Derivative Contracts Volume And Weighted Average Prices) (Details)	Mar. 31, 2018 bbl / d $ / bbl
Oil contracts \| Collar contract for Q2
Derivative [Line Items]
Volume, barrels per day \| bbl / d	3,000
Oil contracts \| Collar contract for Q3
Derivative [Line Items]
Volume, barrels per day \| bbl / d	3,000
Oil contracts \| Collar contract for Q4
Derivative [Line Items]
Volume, barrels per day \| bbl / d	3,000
Oil contracts \| Collar Contracts for next year
Derivative [Line Items]
Volume, barrels per day \| bbl / d	0
Oil contracts \| Collar contracts with short puts for Q2
Derivative [Line Items]
Volume, barrels per day \| bbl / d	149,000
Oil contracts \| Collar contracts with short puts for Q3
Derivative [Line Items]
Volume, barrels per day \| bbl / d	154,000
Oil contracts \| Collar contracts with short puts for Q4
Derivative [Line Items]
Volume, barrels per day \| bbl / d	159,000
Oil contracts \| Collar contracts with short puts for next year
Derivative [Line Items]
Volume, barrels per day \| bbl / d	65,000
Oil contracts, price per bbl \| Collar contract for Q2
Derivative [Line Items]
Ceiling, price per barrel	58.05
Floor, price per barrel	45.00
Oil contracts, price per bbl \| Collar contract for Q3
Derivative [Line Items]
Ceiling, price per barrel	58.05
Floor, price per barrel	45.00
Oil contracts, price per bbl \| Collar contract for Q4
Derivative [Line Items]
Ceiling, price per barrel	58.05
Floor, price per barrel	45.00
Oil contracts, price per bbl \| Collar Contracts for next year
Derivative [Line Items]
Ceiling, price per barrel	0.00
Floor, price per barrel	0.00
Oil contracts, price per bbl \| Collar contracts with short puts for Q2
Derivative [Line Items]
Ceiling, price per barrel	57.79
Floor, price per barrel	47.42
Oil contracts, price per bbl \| Collar contracts with short puts for Q3
Derivative [Line Items]
Ceiling, price per barrel	57.70
Floor, price per barrel	47.34
Oil contracts, price per bbl \| Collar contracts with short puts for Q4
Derivative [Line Items]
Ceiling, price per barrel	57.62
Floor, price per barrel	47.26
Oil contracts, price per bbl \| Collar contracts with short puts for next year
Derivative [Line Items]
Ceiling, price per barrel	60.74
Floor, price per barrel	52.69
Short put \| Collar contracts with short puts for Q2
Derivative [Line Items]
Short put, price per barrel	37.38
Short put \| Collar contracts with short puts for Q3
Derivative [Line Items]
Short put, price per barrel	37.31
Short put \| Collar contracts with short puts for Q4
Derivative [Line Items]
Short put, price per barrel	37.23
Short put \| Collar contracts with short puts for next year
Derivative [Line Items]
Short put, price per barrel	42.69

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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- Definition

The price per unit of the notional amount of the derivative contract expressed in nonmonetary units. For example, the price per barrel specified in a fuel oil forward purchase contract.

+ 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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- 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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