Derivatives (Summary Of Derivative Instruments Contracts) (Details)	Dec. 31, 2021 MMBTU $ / MMBTU $ / bbl bbl
Natural Gas Costless Collars [Member] | Remaining 2022 [Member]
Derivative [Line Items]
Contract total volume | MMBTU	610,000
Natural Gas Costless Collars [Member] | Remaining 2022 [Member] | Minimum [Member]
Derivative [Line Items]
Contract average price	3.50
Natural Gas Costless Collars [Member] | Remaining 2022 [Member] | Maximum [Member]
Derivative [Line Items]
Contract average price	4.19
Natural Gas Costless Collars [Member] | 2023 [Member]
Derivative [Line Items]
Contract total volume | MMBTU	500,000
Natural Gas Costless Collars [Member] | 2023 [Member] | Minimum [Member]
Derivative [Line Items]
Contract average price	3.32
Natural Gas Costless Collars [Member] | 2023 [Member] | Maximum [Member]
Derivative [Line Items]
Contract average price	4.54
Natural Gas Costless Collars [Member] | 2024 [Member]
Derivative [Line Items]
Contract total volume | MMBTU	60,000
Natural Gas Costless Collars [Member] | 2024 [Member] | Minimum [Member]
Derivative [Line Items]
Contract average price	3.00
Natural Gas Costless Collars [Member] | 2024 [Member] | Maximum [Member]
Derivative [Line Items]
Contract average price	4.70
Natural Gas Fixed Price Swaps [Member] | Remaining 2022 [Member]
Derivative [Line Items]
Contract total volume | MMBTU	2,818,000
Contract average price	2.94
Natural Gas Fixed Price Swaps [Member] | 2023 [Member]
Derivative [Line Items]
Contract total volume | MMBTU	1,980,000
Contract average price	3.22
Natural Gas Fixed Price Swaps [Member] | 2024 [Member]
Derivative [Line Items]
Contract total volume | MMBTU	360,000
Contract average price	3.40
Oil Fixed Price Swaps [Member] | Remaining 2022 [Member]
Derivative [Line Items]
Contract average price | $ / bbl	44.25
Contract total volume | bbl	113,000
Oil Fixed Price Swaps [Member] | 2023 [Member]
Derivative [Line Items]
Contract average price | $ / bbl	52.84
Contract total volume | bbl	43,500
Oil Fixed Price Swaps [Member] | 2024 [Member]
Derivative [Line Items]
Contract average price | $ / bbl	67.55
Contract total volume | bbl	4,500