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Derivative Financial Instruments (Schedule of Oil Derivative Contract Volumes And Weighted Average Prices) (Details) (Oil Contracts [Member])
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Jun. 30, 2013
bbl
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2013 Collar Contracts With Short Puts [Member]
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| Derivative [Line Items] | |
| Volume (BBLs per day) | 1,750 |
| Average Price, Ceiling | 116.00 |
| Average Price, Floor | 88.14 |
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2013 Collar Contracts With Short Puts [Member] | Short Put [Member]
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| Derivative [Line Items] | |
| Average Price, Short Put | 73.14 |
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2014 Collar Contracts With Short Puts [Member]
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| Derivative [Line Items] | |
| Volume (BBLs per day) | 5,000 |
| Average Price, Ceiling | 105.74 |
| Average Price, Floor | 100.00 |
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2014 Collar Contracts With Short Puts [Member] | Short Put [Member]
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| Derivative [Line Items] | |
| Average Price, Short Put | 80.00 |
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2013 Swap Contracts [Member]
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| Derivative [Line Items] | |
| Volume (BBLs per day) | 3,000 |
| Average Price, Fixed | 81.02 |
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Subsequent Event [Member] | August through December 2013 Swap Contracts [Member]
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| Derivative [Line Items] | |
| Volume (BBLs per day) | 1,750 |
| Average Price, Fixed | 99.50 |