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Derivative Instruments (Schedule Of Location And Fair Value Of Outstanding Commodity Derivative Contracts) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Derivative instruments - non-current assets	$ 4,362
Derivative instruments - current liabilities	(5,907)	(6,543)
Derivative instruments - non-current liabilities	(3,505)	(3,943)
Crude Oil Collar [Member]
Derivatives, Fair Value [Line Items]
Derivative instruments - non-current assets	4,362
Derivative instruments - current liabilities	(5,907)	(6,543)
Derivative instruments - non-current liabilities	(3,505)	(3,943)
Total Derivative Instruments	$ (5,050)	$ (10,486)

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments which are expected to exist longer than one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.

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