Derivative Financial Instruments (Schedule Of Open Natural Gas Derivative Positions) (Details)	3 Months Ended
	Mar. 31, 2020 MMBTU $ / MMBTU
FERC Henry Hub Price Swaps Natural Gas Q2-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	65,396
Weighted Average Price Swap	2.75
FERC Henry Hub Price Collars Natural Gas Q2-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	171,418
Weighted Average Floor Price	1.89
Weighted Average Ceiling Price	2.37
FERC Henry Hub Price Collars Natural Gas Q1-Q4 2021 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	22,438
Weighted Average Floor Price	2.06
Weighted Average Ceiling Price	2.56
PEPL Basis Swaps Natural Gas Q2-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	30,000
Weighted Average Differential To Henry Hub	(0.47)
El Paso Natural Gas Basis Swaps Q2-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	65,000
Weighted Average Differential To Henry Hub	(0.78)
Houston Ship Channel Natural Gas Basis Swaps Q2-Q4 2020 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	30,000
Weighted Average Differential To Henry Hub	(0.02)
El Paso Natural Gas Basis Swaps Q1-Q4 2021 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	35,000
Weighted Average Differential To Henry Hub	(0.92)