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Derivative Financial Instruments (Schedule Of Open Commodity Derivative Positions) (Details)
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12 Months Ended |
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Dec. 31, 2011
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Q1-Q4 2012 [Member] | Bbl [Member] | Open Oil Derivative Positions [Member] | Price Swaps [Member]
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| Derivative [Line Items] | |
| Volume per day | 22,000 |
| Weighted Average Price | 107.17 |
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Q1-Q4 2012 [Member] | Bbl [Member] | Open Oil Derivative Positions [Member] | Price Collars [Member]
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| Derivative [Line Items] | |
| Volume per day | 54,000 |
| Weighted Average Floor Price | 85.74 |
| Weighted Average Ceiling Price | 126.42 |
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Q1-Q4 2012 [Member] | Bbl [Member] | Open Oil Derivative Positions [Member] | Call Options Sold [Member]
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| Derivative [Line Items] | |
| Volume per day | 19,500 |
| Weighted Average Price | 95.00 |
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Q1-Q4 2012 [Member] | MMBtu [Member] | El Paso Natural Gas Co [Member] | NGL Basis Swap [Member]
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| Derivative [Line Items] | |
| Volume per day | 85,000 |
| Weighted Average Differential to Henry hub | (0.14) |
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Q1-Q4 2012 [Member] | MMBtu [Member] | Panhandle Eastern Pipeline [Member] | NGL Basis Swap [Member]
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| Derivative [Line Items] | |
| Volume per day | 70,000 |
| Weighted Average Differential to Henry hub | (0.15) |
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Q1-Q4 2012 [Member] | MMBtu [Member] | Colorado Interstate Gas Co [Member] | NGL Basis Swap [Member]
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| Derivative [Line Items] | |
| Volume per day | 10,000 |
| Weighted Average Differential to Henry hub | (0.18) |
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Q1-Q4 2012 [Member] | MMBtu [Member] | Open Natural Gas Derivative Positions [Member] | Price Swaps [Member]
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| Derivative [Line Items] | |
| Volume per day | 325,000 |
| Weighted Average Price | 5.09 |
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Q1-Q4 2012 [Member] | MMBtu [Member] | Open Natural Gas Derivative Positions [Member] | Price Collars [Member]
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| Derivative [Line Items] | |
| Volume per day | 490,000 |
| Weighted Average Floor Price | 4.75 |
| Weighted Average Ceiling Price | 5.57 |
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Q1-Q4 2012 [Member] | MMBtu [Member] | Open Natural Gas Derivative Positions [Member] | Call Options Sold [Member]
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| Derivative [Line Items] | |
| Volume per day | 487,500 |
| Weighted Average Price | 6.00 |
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Q1-Q4 2013 [Member] | Bbl [Member] | Open Oil Derivative Positions [Member] | Price Collars [Member]
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| Derivative [Line Items] | |
| Volume per day | 7,000 |
| Weighted Average Floor Price | 90.00 |
| Weighted Average Ceiling Price | 125.12 |