Derivative Financial Instruments (Schedule Of Open Natural Gas Derivative Positions) (Details)	9 Months Ended
Sep. 30, 2018 MMBTU $ / MMBTU
FERC Henry Hub Price Swaps Natural Gas Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	304,000
Weighted Average Price Swap	2.92
FERC Henry Hub Price Swaps Natural Gas Q1-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	215,129
Weighted Average Price Swap	2.81
FERC Henry Hub Price Swaps Natural Gas Q1-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	6,589
Weighted Average Price Swap	2.81
FERC Henry Hub Price Collars Natural Gas Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	267,000
Weighted Average Floor Price	2.76
Weighted Average Ceiling Price	3.09
FERC Henry Hub Price Collars Natural Gas Q1-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	187,775
Weighted Average Floor Price	2.65
Weighted Average Ceiling Price	3.03
FERC Henry Hub Price Collars Natural Gas Q1-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	7,086
Weighted Average Floor Price	2.65
Weighted Average Ceiling Price	2.95
PEPL Basis Swaps Natural Gas Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	120,000
Weighted Average Differential To Henry Hub	(0.51)
PEPL Basis Swaps Natural Gas Q1-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	74,384
Weighted Average Differential To Henry Hub	(0.75)
El Paso Natural Gas Basis Swaps Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	100,000
Weighted Average Differential To Henry Hub	(1.25)
El Paso Natural Gas Basis Swaps Q1-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	130,000
Weighted Average Differential To Henry Hub	(1.46)
Houston Ship Channel Natural Gas Basis Swaps Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	110,000
Weighted Average Differential To Henry Hub	0.01
Houston Ship Channel Natural Gas Basis Swaps Q1-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	122,637
Transco Zone 4 Natural Gas Basis Swaps Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	30,000
Weighted Average Differential To Henry Hub	(0.03)
Transco Zone 4 Natural Gas Basis Swaps Q1-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	7,397
Weighted Average Differential To Henry Hub	(0.03)

Weighted Average Differential To Henry Hub

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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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