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Derivative Instruments and Hedging Activities (Details) (Derivatives Designated as Hedging Instruments)
Dec. 31, 2012
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Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 1
  
Derivative disclosures  
Collar Ceiling Price 4.12
Collar Floor Price 3.09
Volume 35,500
Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 2
  
Derivative disclosures  
Collar Ceiling Price 4.01
Collar Floor Price 3.35
Volume 35,500
Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 3
  
Derivative disclosures  
Collar Ceiling Price 4.12
Collar Floor Price 3.40
Volume 17,700
Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 4
  
Derivative disclosures  
Collar Ceiling Price 4.17
Collar Floor Price 3.60
Volume 17,700
Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 5
  
Derivative disclosures  
Collar Ceiling Price 4.16
Collar Floor Price 3.76
Volume 17,700
Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 6
  
Derivative disclosures  
Collar Ceiling Price 4.34
Collar Floor Price 3.86
Volume 17,700
Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 7
  
Derivative disclosures  
Collar Ceiling Price 6.20
Collar Floor Price 5.15
Volume 17,700
Crude Oil Swaps with contract period of Jan. 2013 - Dec. 2013
  
Derivative disclosures  
Weighted-Average Contract Price 101.90
Volume 1,095