Supplemental Oil And Gas Disclosures (Schedule Of Depreciation, Depletion, Amortization And Accretion Expense) (Details)

v2.4.0.6

Supplemental Oil And Gas Disclosures (Schedule Of Depreciation, Depletion, Amortization And Accretion Expense) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplemental Oil And Gas Disclosures [Abstract]
Depreciation, depletion, amortization and accretion per Mcfe	$ 3.24	$ 3.38	$ 3.61