Derivatives (Summary Of Derivative Instruments Contracts) (Details)	Jun. 30, 2020 MMBTU $ / MMBTU $ / bbl bbl
Natural Gas Costless Collars [Member] | Derivative Contract Period One [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	10,000
Natural Gas Costless Collars [Member] | Derivative Contract Period One [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.20
Natural Gas Costless Collars [Member] | Derivative Contract Period One [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.59
Natural Gas Costless Collars [Member] | Derivative Contract Period Two [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	50,000
Natural Gas Costless Collars [Member] | Derivative Contract Period Two [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Two [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.90
Natural Gas Costless Collars [Member] | Derivative Contract Period Three [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	40,000
Natural Gas Costless Collars [Member] | Derivative Contract Period Three [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Three [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	3.10
Natural Gas Costless Collars [Member] | Derivative Contract Period Four [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	26,500
Natural Gas Costless Collars [Member] | Derivative Contract Period Four [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Four [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Five [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	28,000
Natural Gas Costless Collars [Member] | Derivative Contract Period Five [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Five [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Six [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	32,000
Natural Gas Costless Collars [Member] | Derivative Contract Period Six [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Six [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Seven [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	25,500
Natural Gas Costless Collars [Member] | Derivative Contract Period Seven [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Seven [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Eight [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	30,500
Natural Gas Costless Collars [Member] | Derivative Contract Period Eight [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Eight [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Nine [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	31,500
Natural Gas Costless Collars [Member] | Derivative Contract Period Nine [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Nine [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Ten [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	32,500
Natural Gas Costless Collars [Member] | Derivative Contract Period Ten [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Ten [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Eleven [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	30,500
Natural Gas Costless Collars [Member] | Derivative Contract Period Eleven [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Eleven [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Twelve [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	31,500
Natural Gas Costless Collars [Member] | Derivative Contract Period Twelve [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Twelve [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Thirteen [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	12,500
Natural Gas Costless Collars [Member] | Derivative Contract Period Thirteen [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Thirteen [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Fourteen [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	11,000
Natural Gas Costless Collars [Member] | Derivative Contract Period Fourteen [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Fourteen [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Fifteen [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	9,000
Natural Gas Costless Collars [Member] | Derivative Contract Period Fifteen [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Fifteen [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Sixteen [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	8,000
Natural Gas Costless Collars [Member] | Derivative Contract Period Sixteen [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Sixteen [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Seventeen [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	10,000
Natural Gas Costless Collars [Member] | Derivative Contract Period Seventeen [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Seventeen [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Costless Collars [Member] | Derivative Contract Period Eighteen [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	25,500
Natural Gas Costless Collars [Member] | Derivative Contract Period Eighteen [Member] | Minimum [Member]
Derivative [Line Items]
Contract price	2.30
Natural Gas Costless Collars [Member] | Derivative Contract Period Eighteen [Member] | Maximum [Member]
Derivative [Line Items]
Contract price	2.85
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Nineteen [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	80,000
Contract price	2.750
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Twenty [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	10,000
Contract price	2.405
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Twenty One [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	10,000
Contract price	2.661
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Twenty Two [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	10,000
Contract price	2.765
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Twenty Three [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	50,000
Contract price	2.729
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Twenty Four [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	26,500
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Twenty Five [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	28,000
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Twenty Six [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	32,000
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Twenty Seven [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	25,500
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Twenty Eight [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	30,500
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Twenty Nine [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	31,500
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Thirty [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	32,500
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Thirty One [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	30,500
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Thirty Two [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	31,500
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Thirty Three [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	12,500
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Thirty Four [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	11,000
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Thirty Five [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	9,000
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Thirty Six [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	8,000
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Thirty Seven [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	10,000
Contract price	2.582
Natural Gas Fixed Price Swaps [Member] | Derivative Contract Period Thirty Eight [Member]
Derivative [Line Items]
Production volume covered per month - Gas/Natural gas | MMBTU	25,500
Contract price	2.582
Oil Costless Collars [Member] | Derivative Contract Period Thirty Nine [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl	2,000
Oil Costless Collars [Member] | Derivative Contract Period Thirty Nine [Member] | Minimum [Member]
Derivative [Line Items]
Contract price | $ / bbl	55.00
Oil Costless Collars [Member] | Derivative Contract Period Thirty Nine [Member] | Maximum [Member]
Derivative [Line Items]
Contract price | $ / bbl	62.00
Oil Costless Collars [Member] | Derivative Contract Period Forty [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl	1,000
Oil Costless Collars [Member] | Derivative Contract Period Forty [Member] | Minimum [Member]
Derivative [Line Items]
Contract price | $ / bbl	36.00
Oil Costless Collars [Member] | Derivative Contract Period Forty [Member] | Maximum [Member]
Derivative [Line Items]
Contract price | $ / bbl	43.60
Oil Costless Collars [Member] | Derivative Contract Period Forty One [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl	500
Oil Costless Collars [Member] | Derivative Contract Period Forty One [Member] | Minimum [Member]
Derivative [Line Items]
Contract price | $ / bbl	36.00
Oil Costless Collars [Member] | Derivative Contract Period Forty One [Member] | Maximum [Member]
Derivative [Line Items]
Contract price | $ / bbl	43.60
Oil Costless Collars [Member] | Derivative Contract Period Forty Two [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl	2,000
Oil Costless Collars [Member] | Derivative Contract Period Forty Two [Member] | Minimum [Member]
Derivative [Line Items]
Contract price | $ / bbl	36.00
Oil Costless Collars [Member] | Derivative Contract Period Forty Two [Member] | Maximum [Member]
Derivative [Line Items]
Contract price | $ / bbl	43.60
Oil Costless Collars [Member] | Derivative Contract Period Forty Three [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl	1,500
Oil Costless Collars [Member] | Derivative Contract Period Forty Three [Member] | Minimum [Member]
Derivative [Line Items]
Contract price | $ / bbl	36.00
Oil Costless Collars [Member] | Derivative Contract Period Forty Three [Member] | Maximum [Member]
Derivative [Line Items]
Contract price | $ / bbl	43.60
Oil Costless Collars [Member] | Derivative Contract Period Forty Four [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl	2,000
Oil Costless Collars [Member] | Derivative Contract Period Forty Four [Member] | Minimum [Member]
Derivative [Line Items]
Contract price | $ / bbl	36.00
Oil Costless Collars [Member] | Derivative Contract Period Forty Four [Member] | Maximum [Member]
Derivative [Line Items]
Contract price | $ / bbl	43.60
Oil Costless Collars [Member] | Derivative Contract Period Forty Five [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl	2,500
Oil Costless Collars [Member] | Derivative Contract Period Forty Five [Member] | Minimum [Member]
Derivative [Line Items]
Contract price | $ / bbl	36.00
Oil Costless Collars [Member] | Derivative Contract Period Forty Five [Member] | Maximum [Member]
Derivative [Line Items]
Contract price | $ / bbl	43.60
Oil Fixed Price Swaps [Member] | Derivative Contract Period Forty Six [Member]
Derivative [Line Items]
Contract price | $ / bbl	55.28
Production volume covered per month - Oil | bbl	2,000
Oil Fixed Price Swaps [Member] | Derivative Contract Period Forty Seven [Member]
Derivative [Line Items]
Contract price | $ / bbl	58.65
Production volume covered per month - Oil | bbl	2,000
Oil Fixed Price Swaps [Member] | Derivative Contract Period Forty Eight [Member]
Derivative [Line Items]
Contract price | $ / bbl	60.00
Production volume covered per month - Oil | bbl	2,000
Oil Fixed Price Swaps [Member] | Derivative Contract Period Forty Nine [Member]
Derivative [Line Items]
Contract price | $ / bbl	58.05
Production volume covered per month - Oil | bbl	2,000
Oil Fixed Price Swaps [Member] | Derivative Contract Period Fifty [Member]
Derivative [Line Items]
Contract price | $ / bbl	58.10
Production volume covered per month - Oil | bbl	2,000
Oil Fixed Price Swaps [Member] | Derivative Contract Period Fifty One [Member]
Derivative [Line Items]
Contract price | $ / bbl	37.00
Production volume covered per month - Oil | bbl	8,000