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Derivative Instruments (Schedule Of Location And Fair Value Of Outstanding Commodity Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Other current assets - current assets | $ 80 | $ 491
Derivative instruments - non-current assets | 486 | 4,362
Derivative instruments - current liabilities | (16,469) | (5,907)
Derivative instruments - non-current liabilities | (6,434) | (3,505)
Total derivative instruments | 22,345 |
Crude Oil Collar [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Other current assets - current assets | 72 |
Derivative instruments - non-current assets | 486 | 4,362
Derivative instruments - current liabilities | (16,469) | (5,907)
Derivative instruments - non-current liabilities | (6,434) | (3,505)
Total derivative instruments | $ 22,345 | $ 5,050

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