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Derivative Instruments and Hedging Activities (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
$ / Mcf
MMcf
Dec. 31, 2014
USD ($)
Apr. 01, 2014
USD ($)
Derivative disclosures          
Unrealized losses included in accumulated other comprehensive income and will reclassified into natural gas and crude oil revenues , pre-tax | $         $ 73,400,000
Unrealized losses included in accumulated other comprehensive income and will reclassified into natural gas and crude oil revenues , net of tax | $     $ 0 $ 0 $ 44,200,000
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net | $ $ 0 $ 0      
Derivatives Designated as Hedges | Natural Gas Collars with contract period of July 2015 - December 2015          
Derivative disclosures          
Volume | MMcf     35,700.0    
Derivatives Designated as Hedges | Natural Gas Collars with contract period of July 2015 - December 2015 | Minimum          
Derivative disclosures          
Collar Floor Price     3.86    
Collar Ceiling Price     4.27    
Derivatives Designated as Hedges | Natural Gas Collars with contract period of July 2015 - December 2015 | Maximum          
Derivative disclosures          
Collar Floor Price     3.91    
Collar Ceiling Price     4.43    
Derivatives Designated as Hedges | Natural Gas Collars with contract period of July 2015 - December 2015 | Weighted Average          
Derivative disclosures          
Collar Floor Price     3.87    
Collar Ceiling Price     4.35    
Derivatives Designated as Hedges | Natural Gas Swaps with contract period of July 2015 - December 2015          
Derivative disclosures          
Volume | MMcf     35,700.0    
Derivatives Designated as Hedges | Natural Gas Swaps with contract period of July 2015 - December 2015 | Weighted Average          
Derivative disclosures          
Swaps Weighted Average     3.92    
Derivatives Designated as Hedges | Natural Gas Swaps with contract period of July 2015 - October 2015          
Derivative disclosures          
Volume | MMcf     17,900.0    
Derivatives Designated as Hedges | Natural Gas Swaps with contract period of July 2015 - October 2015 | Weighted Average          
Derivative disclosures          
Swaps Weighted Average     3.36