XML 47 R52.htm IDEA: XBRL DOCUMENT v2.4.0.6
Derivative Instruments (Schedule Of Outstanding Commodity Derivative Contracts Not Designated As Hedges) (Details) (Crude Oil Collar [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
2012 Two-Way Collars [Member]
Dec. 31, 2011
2012 Three-Way Collars [Member]
Dec. 31, 2011
2012 Deferred Puts [Member]
Dec. 31, 2011
2013 Two-Way Collars [Member]
Dec. 31, 2011
2013 Three-Way Collars [Member]
Dec. 31, 2011
2013 Deferred Puts [Member]
Dec. 31, 2011
2014 Two-Way Collars [Member]
Dec. 31, 2011
2014 Three-Way Collars [Member]
Derivative Instruments [Line Items]                    
Settlement Period     2012 2012 2012 2013 2013 2013 2014 2014
Total Notional Amount of Oil (Barrels)     1,756,718 2,906,500 641,000 807,500 1,887,000 93,000 62,000 155,000
Average Sub-Floor Price       65.36 72.61   70.19 71.67   71.00
Average Floor Price     85.49 89.97 92.61 89.23 90.84 91.67 90.00 91.00
Average Ceiling Price     106.44 108.24   111.69 112.60   112.78 113.04
Average Deferred Premium         6.10     6.33    
Fair Value Asset (Liability) $ 5,050 $ 10,486 $ (3,116) $ (2,046) $ (745) $ 2,326 $ (1,612) $ (33) $ 289 $ (113)