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Derivative Financial Instruments (Schedule Of Open Commodity Derivative Positions) (Details)
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Jun. 30, 2012
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Q3-Q4 2012 [Member] | Bbl [Member] | Open Oil Derivative Positions [Member] | Price Swaps [Member]
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| Derivative [Line Items] | |
| Volume per day | 54,000 |
| Weighted Average Price | 105.90 |
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Q3-Q4 2012 [Member] | Bbl [Member] | Open Oil Derivative Positions [Member] | Price Collars [Member]
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| Derivative [Line Items] | |
| Volume per day | 74,000 |
| Weighted Average Floor Price | 89.71 |
| Weighted Average Ceiling Price | 123.09 |
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Q3-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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Q3-Q4 2012 [Member] | MMBtu [Member] | Open Natural Gas Derivative Positions [Member] | Price Swaps [Member]
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| Derivative [Line Items] | |
| Volume per day | 573,370 |
| Weighted Average Price | 4.04 |
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Q3-Q4 2012 [Member] | MMBtu [Member] | Open Natural Gas Derivative Positions [Member] | Price Collars [Member]
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| Derivative [Line Items] | |
| Volume per day | 991,685 |
| Weighted Average Floor Price | 3.71 |
| Weighted Average Ceiling Price | 4.40 |
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Q3-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 Swaps [Member]
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| Derivative [Line Items] | |
| Volume per day | 31,000 |
| Weighted Average Price | 104.13 |
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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 | 45,000 |
| Weighted Average Floor Price | 91.30 |
| Weighted Average Ceiling Price | 116.23 |
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Q1-Q4 2013 [Member] | Bbl [Member] | Open Oil Derivative Positions [Member] | Call Options Sold [Member]
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| Derivative [Line Items] | |
| Volume per day | 6,000 |
| Weighted Average Price | 120.00 |
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Q1-Q4 2013 [Member] | MMBtu [Member] | Open Natural Gas Derivative Positions [Member] | Price Swaps [Member]
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| Derivative [Line Items] | |
| Volume per day | 150,000 |
| Weighted Average Price | 4.50 |
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Q1-Q4 2014 [Member] | Bbl [Member] | Open Oil Derivative Positions [Member] | Price Swaps [Member]
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| Derivative [Line Items] | |
| Volume per day | 4,000 |
| Weighted Average Price | 100.49 |
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Q1-Q4 2014 [Member] | Bbl [Member] | Open Oil Derivative Positions [Member] | Price Collars [Member]
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| Derivative [Line Items] | |
| Volume per day | 2,000 |
| Weighted Average Floor Price | 90.00 |
| Weighted Average Ceiling Price | 111.13 |
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Q1-Q4 2014 [Member] | Bbl [Member] | Open Oil Derivative Positions [Member] | Call Options Sold [Member]
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| Derivative [Line Items] | |
| Volume per day | 6,000 |
| Weighted Average Price | 120.00 |
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Q1-Q4 2014 [Member] | MMBtu [Member] | Open Natural Gas Derivative Positions [Member] | Call Options Sold [Member]
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| Derivative [Line Items] | |
| Volume per day | 150,000 |
| Weighted Average Price | 5.00 |