Derivative Financial Instruments (Schedule Of Open Natural Gas Derivative Positions) (Details)	12 Months Ended
Dec. 31, 2017 MMBTU $ / MMBTU
FERC Henry Hub Price Swaps Natural Gas Q1-Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	371,956
Weighted Average Price Swap	3.06
FERC Henry Hub Price Swaps Natural Gas Q1-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	28,466
Weighted Average Price Swap	2.98
FERC Henry Hub Price Collars Natural Gas Q1-Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	197,516
Weighted Average Floor Price	2.94
Weighted Average Ceiling Price	3.26
FERC Henry Hub Price Collars Natural Gas Q1-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	28,466
Weighted Average Floor Price	2.84
Weighted Average Ceiling Price	3.14
PEPL Basis Swaps Natural Gas Q1-Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	50,000
Weighted Average Differential To Henry Hub	(0.29)

Weighted Average Differential To Henry Hub

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

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 energy measure 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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