Annual report pursuant to Section 13 and 15(d)

Hedging Activities (Schedule Of Derivative Instruments) (Details)

v2.4.0.6
Hedging Activities (Schedule Of Derivative Instruments) (Details)
Dec. 31, 2012
Jul. 31, 2012
Feb. 29, 2012
Dec. 31, 2011
Dec. 31, 2010
Feb. 28, 2010
Derivative [Line Items]            
Daily Volume (Bbls/day) 4,000 3,000 2,000 2,000 2,300 3,000
Fixed Price Swap, Period of January 2013 through December 2013 [Member]
            
Derivative [Line Items]            
Daily Volume (Bbls/day) 5,000          
Weighted Average Price (usd per bbl) 100.90