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Derivative Financial Instruments (Schedule Of Open Natural Gas Derivative Positions) (Details)
6 Months Ended
Jun. 30, 2021
MMBTU
$ / MMBTU
FERC Henry Hub Price Swaps Natural Gas Q1-Q4 2022 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (MMBtu/d) | MMBTU 3,452 [1]
Weighted Average Price Swap 2.85 [1]
FERC Henry Hub Price Swaps Natural Gas Q3-Q4 2021 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (MMBtu/d) | MMBTU 266,500 [1]
Weighted Average Price Swap 2.63 [1]
FERC Henry Hub Price Swaptions Natural Gas Q1-Q4 2022 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (MMBtu/d) | MMBTU 100,000 [2]
Weighted Average Price Swap 2.70 [2]
FERC Henry Hub Price Collars Natural Gas Q1-Q4 2022 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (MMBtu/d) | MMBTU 113,110 [2]
Weighted Average Floor Price 2.57 [2]
Weighted Average Ceiling Price 3.07 [2]
FERC Henry Hub Price Collars Natural Gas Q3-Q4 2021 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (MMBtu/d) | MMBTU 180,500 [2]
Weighted Average Floor Price 2.48 [2]
Weighted Average Ceiling Price 2.98 [2]
FERC Henry Hub Call Options Sold Natural Gas Q2-Q4 2021 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (MMBtu/d) | MMBTU 50,000 [2]
Weighted Average Price Swap 2.68 [2]
El Paso Natural Gas Basis Swaps Q3-Q4 2021 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (MMBtu/d) | MMBTU 35,000
Weighted Average Differential To Henry Hub (0.92)
WAHA Natural Gas Basis Swaps Q3-Q4 2021 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (MMBtu/d) | MMBTU 80,000
Weighted Average Differential To Henry Hub (0.65)
WAHA Natural Gas Basis Swaps Q1-Q4 2022 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (MMBtu/d) | MMBTU 70,000
Weighted Average Differential To Henry Hub (0.57)
WAHA Natural Gas Basis Swaps Q1-Q4 2023 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (MMBtu/d) | MMBTU 70,000
Weighted Average Differential To Henry Hub (0.51)
WAHA Natural Gas Basis Swaps Q1-Q4 2024 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (MMBtu/d) | MMBTU 40,000
Weighted Average Differential To Henry Hub (0.51)
[1]

Related to the 2021 open positions, 26,500 MMBtu/d settle against the Inside FERC first of month Henry Hub index at an average price of $2.77 and 240,000 MMBtu/d settle against the end of month NYMEX index at an average price of $2.62. All 2022 open positions settle against the Inside FERC first of month Henry Hub index.

[2]

Price swaptions and call options settle against end of month NYMEX index. Price collars settle against the Inside FERC first of month Henry Hub Index.