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Derivative Instruments (Schedule Of Outstanding Commodity Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Derivative Instruments [Line Items]  
Fair Value Asset (Liability) $ (22,345)
2012 Two-Way Collars [Member]
  
Derivative Instruments [Line Items]  
Settlement Period 2012
Total Notional Amount of Oil (Barrels) 1,237,500
Average Floor Price 85.56
Average Ceiling Price 106.50
Fair Value Asset (Liability) (5,427)
2012 Three-Way Collars [Member]
  
Derivative Instruments [Line Items]  
Settlement Period 2012
Total Notional Amount of Oil (Barrels) 2,872,000
Average Sub-Floor Price 66.62
Average Floor Price 90.45
Average Ceiling Price 109.14
Fair Value Asset (Liability) (7,471)
2013 Two-Way Collars [Member]
  
Derivative Instruments [Line Items]  
Settlement Period 2013
Total Notional Amount of Oil (Barrels) 807,500
Average Floor Price 89.23
Average Ceiling Price 111.69
Fair Value Asset (Liability) (1,646)
2013 Three-Way Collars [Member]
  
Derivative Instruments [Line Items]  
Settlement Period 2013
Total Notional Amount of Oil (Barrels) 2,404,500
Average Sub-Floor Price 69.33
Average Floor Price 91.61
Average Ceiling Price 113.25
Fair Value Asset (Liability) (7,338)
2014 Two-Way Collars [Member]
  
Derivative Instruments [Line Items]  
Settlement Period 2014
Total Notional Amount of Oil (Barrels) 62,000
Average Floor Price 90.00
Average Ceiling Price 112.78
Fair Value Asset (Liability) 1
2014 Three-Way Collars [Member]
  
Derivative Instruments [Line Items]  
Settlement Period 2014
Total Notional Amount of Oil (Barrels) 186,000
Average Sub-Floor Price 70.00
Average Floor Price 91.67
Average Ceiling Price 113.58
Fair Value Asset (Liability) $ (464)