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Derivative Financial Instruments (Schedule Of Oil Derivative Contracts Volume And Weighted Average Prices) (Details)
 1 Months Ended 3 Months Ended
Aug. 03, 2012
bbl
Jun. 30, 2012
MMBTU
bbl
2012 - Collar Contracts With Short Puts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl)   51,610
Average Daily Gas Production Derivatives Volume (MMBTU)   0
2012 - Collar Contracts With Short Puts [Member] | Ceiling [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl   118.73
Average Daily Gas Production Derivatives Price Per MMBtu   0.00
2012 - Collar Contracts With Short Puts [Member] | Floor [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl   84.80
Average Daily Gas Production Derivatives Price Per MMBtu   0.00
2012 - Collar Contracts With Short Puts [Member] | Short Put [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl   69.12
Average Daily Gas Production Derivatives Price Per MMBtu   0.00
2013 - Collar Contracts With Short Puts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl)   67,290
Average Daily Gas Production Derivatives Volume (MMBTU)   0
2013 - Collar Contracts With Short Puts [Member] | Ceiling [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl   120.61
Average Daily Gas Production Derivatives Price Per MMBtu   0.00
2013 - Collar Contracts With Short Puts [Member] | Floor [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl   88.88
Average Daily Gas Production Derivatives Price Per MMBtu   0.00
2013 - Collar Contracts With Short Puts [Member] | Short Put [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl   71.72
Average Daily Gas Production Derivatives Price Per MMBtu   0.00
2014 - Collar Contracts With Short Puts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl) 5,000 40,000
Average Daily Gas Production Derivatives Volume (MMBTU)   30,000 [1]
2014 - Collar Contracts With Short Puts [Member] | Ceiling [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl 102.22 122.77
Average Daily Gas Production Derivatives Price Per MMBtu   7.66 [1]
2014 - Collar Contracts With Short Puts [Member] | Floor [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl 95.00 91.50
Average Daily Gas Production Derivatives Price Per MMBtu   5.67 [1]
2014 - Collar Contracts With Short Puts [Member] | Short Put [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl 80.00 74.88
Average Daily Gas Production Derivatives Price Per MMBtu   4.33 [1]
2015 Collar Contracts With Short Puts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Daily Gas Production Derivatives Volume (MMBTU)   135,000 [1]
2015 Collar Contracts With Short Puts [Member] | Ceiling [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Daily Gas Production Derivatives Price Per MMBtu   5.44 [1]
2015 Collar Contracts With Short Puts [Member] | Floor [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Daily Gas Production Derivatives Price Per MMBtu   4.22 [1]
2015 Collar Contracts With Short Puts [Member] | Short Put [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Daily Gas Production Derivatives Price Per MMBtu   3.22 [1]
2012 - Collar Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl)   2,000
Average Daily Gas Production Derivatives Volume (MMBTU)   65,000
2012 - Collar Contracts [Member] | Ceiling [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl   127.00
Average Daily Gas Production Derivatives Price Per MMBtu   6.60
2012 - Collar Contracts [Member] | Floor [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl   90.00
Average Daily Gas Production Derivatives Price Per MMBtu   5.00
2013 Collar Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl)   0
Average Daily Gas Production Derivatives Volume (MMBTU)   150,000
2013 Collar Contracts [Member] | Ceiling [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl   0.00
Average Daily Gas Production Derivatives Price Per MMBtu   6.25
2013 Collar Contracts [Member] | Floor [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl   0.00
Average Daily Gas Production Derivatives Price Per MMBtu   5.00
2014 Collar Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl)   0
Average Daily Gas Production Derivatives Volume (MMBTU)   80,000 [1]
2014 Collar Contracts [Member] | Ceiling [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl   0.00
Average Daily Gas Production Derivatives Price Per MMBtu   6.39 [1]
2014 Collar Contracts [Member] | Floor [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Price per Bbl   0.00
Average Daily Gas Production Derivatives Price Per MMBtu   5.00 [1]
2015 Collar Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Daily Gas Production Derivatives Volume (MMBTU)   50,000 [1]
2015 Collar Contracts [Member] | Ceiling [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Daily Gas Production Derivatives Price Per MMBtu   7.92 [1]
2015 Collar Contracts [Member] | Floor [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Daily Gas Production Derivatives Price Per MMBtu   5.00 [1]
2012 Swap Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl) 8,000 3,000 [2]
Average Daily Gas Production Derivatives Volume (MMBTU)   275,000
Average Price per Bbl 93.09 79.32
Average Daily Gas Production Derivatives Price Per MMBtu   4.97
2013 Swap Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl)   3,000 [2]
Average Daily Gas Production Derivatives Volume (MMBTU)   112,500
Average Price per Bbl   81.02
Average Daily Gas Production Derivatives Price Per MMBtu   5.62
2014 Swap Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl)   0 [2]
Average Daily Gas Production Derivatives Volume (MMBTU)   10,000 [1]
Average Price per Bbl   0.00
Average Daily Gas Production Derivatives Price Per MMBtu   6.18 [1]
2015 Swap Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Daily Gas Production Derivatives Volume (MMBTU)   0 [1]
Average Daily Gas Production Derivatives Price Per MMBtu   0.00 [1]
2012 - Rollfactor Swap Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl)   0
Average Price per Bbl   0.00 [3]
2013 Rollfactor Swap Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl)   6,000
Average Price per Bbl   0.43 [3]
2014 Rollfactor Swap Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl)   0
Average Price per Bbl   0.00 [3]
2012 Basis Swap Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl)   20,000
Average Daily Gas Production Derivatives Volume (MMBTU)   136,000
Average Price per Bbl   (1.15) [4]
Average Daily Gas Production Derivatives Price Per MMBtu   (0.34)
2013 Basis Swap Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl)   0
Average Daily Gas Production Derivatives Volume (MMBTU)   142,500
Average Price per Bbl   0.00 [4]
Average Daily Gas Production Derivatives Price Per MMBtu   (0.22)
2014 Basis Swap Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Volume (Bbl)   0
Average Daily Gas Production Derivatives Volume (MMBTU)   140,000 [1]
Average Price per Bbl   0.00 [4]
Average Daily Gas Production Derivatives Price Per MMBtu   (0.21) [1]
2015 Basis Swap Contracts [Member]
    
Trading Activity, Gains and Losses, Net [Line Items]    
Average Daily Gas Production Derivatives Volume (MMBTU)   0 [1]
Average Daily Gas Production Derivatives Price Per MMBtu   0.00 [1]
[1] Subsequent to June 30, 2012, the Company (i) terminated its 2014 gas derivative positions, including basis swaps, for net proceeds of $47.1 million, (ii) terminated its 2015 collar contracts for proceeds of $19.4 million and (iii) terminated 2015 collar contracts with short puts for 30,000 MMBTU per day with a ceiling price of $7.11 per MMBTU, a floor price of $5.00 per MMBTU and a short put price of $4.00 per MMBTU for proceeds of $4.7 million.
[2] Subsequent to June 30, 2012, the Company entered into additional NYMEX (i) swap contracts for 8,000 BBLs per day of August 2012 through December 2012 production with a price of $93.09 per BBL and (ii) collar contracts with short puts for 5,000 BBLs per day of 2014 production with a ceiling price of $102.22 per BBL, a floor price of $95.00 per BBL and a short put price of $80.00 per BBL.
[3] Represents swaps that fix the difference between (i) each day's price per BBL of WTI for the first nearby month less (ii) the price per BBL of WTI for the second nearby NYMEX month, multiplied by .6667; plus (iii) each day's price per BBL of WTI for the first nearby month less (iv) the price per BBL of WTI for the third nearby NYMEX month, multiplied by .3333.
[4] Basis differential price between Midland WTI and Cushing WTI.