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Derivative Instruments (Schedule Of Location And Fair Value Of Outstanding Commodity Derivative Instruments) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative instruments -current assets	$ 35,257
Derivative instruments - non-current assets	18,167	4,362
Derivative instruments - current liabilities		(5,907)
Derivative instruments - non-current liabilities		(3,505)
Total derivative instruments	53,424
Crude Oil Collar [Member]
Derivatives, Fair Value [Line Items]
Derivative instruments -current assets	35,257
Derivative instruments - non-current assets	18,167	4,362
Derivative instruments - current liabilities		(5,907)
Derivative instruments - non-current liabilities		(3,505)
Total derivative instruments	$ 53,424	$ (5,050)

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