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Derivative Instruments and Hedging Activities (Tables)
 9 Months Ended
Sep. 30, 2012
Derivative Instruments and Hedging Activities (Tables) [Abstract]  
Commodity derivative expense (income), included in our Unaudited Condensed Consolidated Statements of Operations

The following is a summary of “Derivatives expense (income)” included in the accompanying Unaudited Condensed Consolidated Statements of Operations for the periods indicated:

     Three Months Ended Nine Months Ended
     September 30, September 30,
In thousands 2012 2011 2012 2011
Oil            
 Payment on settlements of derivative contracts $ 641 $ 1,857 $ 9,580 $ 23,857
 Fair value adjustments to derivative contracts – expense (income)   60,726   (205,355)   (37,752)   (225,485)
  Total derivatives expense (income) – oil   61,367   (203,498)   (28,172)   (201,628)
Natural Gas            
 Receipt on settlements of derivative contracts   (6,910)   (6,427)   (21,941)   (19,073)
 Fair value adjustments to derivative contracts – expense (income)   7,174   (229)   17,910   8,393
  Total derivatives expense (income) – natural gas   264   (6,656)   (4,031)   (10,680)
   Derivatives expense (income) $ 61,631 $ (210,154) $ (32,203) $ (212,308)
Commodity derivative contracts not classified as hedging instruments

The following tables present outstanding commodity derivative contracts with respect to future production as of September 30, 2012:

          Contract Prices(2)
      Type of      Weighted Average Price
Year Months Contract Volume(1)  Range Swap Floor Ceiling
                     
Oil Contracts:                
2012 Oct – Dec Swap  625 $80.28 – 81.75 $ 81.04 $ — $ —
      Collar  53,000  80.00 – 140.65   —   80.00   128.57
      Put  625  65.00 – 65.00   —   65.00   —
    Total Oct – Dec 2012  54,250            
                     
                     
2013 Jan – Mar Collar  55,000 $70.00 – 113.00 $ — $ 78.91 $ 108.01
    Apr – June Collar  56,000  75.00 – 121.50   —   79.64   108.61
    July – Sept Collar  56,000  75.00 – 133.10   —   79.64   109.15
    Oct – Dec Collar  54,000  80.00 – 127.50   —   80.00   117.53
                     
                     
2014 Jan – Mar Collar  46,000 $80.00 – 104.50 $ — $ 80.00 $ 103.13
    Apr – June Collar  46,000  80.00 – 104.50   —   80.00   103.13
                     
                     
Natural Gas Contracts:                
2012 Oct – Dec Swap  20,000 $6.30 – 6.85 $ 6.53 $ — $ —
                     
(1)Contract volumes are stated in Bbl/d and MMBtu/d for oil and natural gas contracts, respectively.
(2)Contract prices are stated in $/Bbl and $/MMBtu for oil and natural gas contracts, respectively.
Derivative financial instruments included in our Unaudited Condensed Consolidated Balance Sheet

At September 30, 2012 and December 31, 2011, we had derivative financial instruments recorded in our Unaudited Condensed Consolidated Balance Sheets as follows:

       Estimated Fair Value
       Asset (Liability)
    September 30, December 31,
Type of Contract Balance Sheet Location 2012 2011
       In thousands
Derivatives not designated as hedging instruments:      
 Derivative asset        
  Crude oil contracts Derivative assets – current $ 10,780 $ 23,452
  Natural gas contracts Derivative assets – current   6,040   23,950
  Crude oil contracts Derivative assets – long-term   12,820   29
            
 Derivative liability        
  Crude oil contracts Derivative liabilities – current   (1,680)   (22,610)
  Deferred premiums(1) Derivative liabilities – current   (715)   (3,913)
  Crude oil contracts Derivative liabilities – long-term   (1,999)   (18,702)
  Deferred premiums(1) Derivative liabilities – long-term   —   (170)
   Total derivatives not designated as hedging instruments $ 25,246 $ 2,036
            
(1)Deferred premiums payable relate to various oil floor contracts and are payable on a monthly basis through January 2013.