Derivative Financial Instruments (Schedule Of Open Natural Gas Derivative Positions) (Details)	6 Months Ended
Jun. 30, 2018 MMBTU $ / MMBTU
FERC Henry Hub Price Swaps Natural Gas Q3-Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	273,750
Weighted Average Price Swap	2.91
FERC Henry Hub Price Swaps Natural Gas Q1-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	181,122
Weighted Average Price Swap	2.81
FERC Henry Hub Price Collars Natural Gas Q3-Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	242,250
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	146,810
Weighted Average Floor Price	2.65
Weighted Average Ceiling Price	3.04
PEPL Basis Swaps Natural Gas Q3-Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	120,000
Weighted Average Differential To Henry Hub	(0.51)
El Paso Natural Gas Basis Swaps Q3-Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	100,000
Weighted Average Differential To Henry Hub	(1.25)
Houston Ship Channel Natural Gas Basis Swaps Q3-Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	115,000
Weighted Average Differential To Henry Hub	0.01
Transco Zone 4 Natural Gas Basis Swaps Q3-Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	15,000
Weighted Average Differential To Henry Hub	(0.03)
PEPL Basis Swaps Natural Gas Q1-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	54,548
Weighted Average Differential To Henry Hub	(0.78)
El Paso Natural Gas Basis Swaps Q1-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	110,000
Weighted Average Differential To Henry Hub	(1.50)
Houston Ship Channel Natural Gas Basis Swaps Q1-Q4 2019 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	92,500
Weighted Average Differential To Henry Hub	(0.01)
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

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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