Derivative Instruments and Hedging Activities (Details) (Derivatives Designated as Hedging Instruments)	Dec. 31, 2013 MMcf
Natural Gas Collars with contract period of Jan. 2014 - Dec. 2014 Tranche 1
Derivative disclosures
Volume	336,800
Natural Gas Collars with contract period of Jan. 2014 - Dec. 2014 Tranche 1 | Minimum
Derivative disclosures
Collar Floor Price	3.60
Collar Ceiling Price	4.22
Natural Gas Collars with contract period of Jan. 2014 - Dec. 2014 Tranche 1 | Maximum
Derivative disclosures
Collar Floor Price	4.37
Collar Ceiling Price	4.80
Natural Gas Collars with contract period of Jan. 2014 - Dec. 2014 Tranche 1 | Weighted Average
Derivative disclosures
Collar Floor Price	4.13
Collar Ceiling Price	4.51
Natural Gas Swaps with contract period of Jan. 2014 - Dec. 2014 | Weighted Average
Derivative disclosures
Volume	35,500
Swaps Weighted Average	4.12