Derivative Commodity Instruments - Hedging Transactions (Details)	3 Months Ended
	Mar. 31, 2014 Mcf
Natural Gas | 2014 | NYMEX Swaps
Derivative [Line Items]
Total Hedged Volumes	7,900,000
Average Contract Price, per Mcf	4.55
Natural Gas | 2014 | Basin Specific Swaps - San Juan
Derivative [Line Items]
Total Hedged Volumes	23,500,000
Average Contract Price, per Mcf	4.60
Natural Gas | 2014 | San Juan Basis Swaps
Derivative [Line Items]
Total Hedged Volumes	4,600,000
Average Contract Price, per Mcf	(0.09)
Natural Gas | 2014 | Permian Basis Swaps
Derivative [Line Items]
Total Hedged Volumes	1,500,000
Average Contract Price, per Mcf	(0.17)
Natural Gas | 2014 | Basin Specific Swaps - Permian
Derivative [Line Items]
Total Hedged Volumes	7,400,000
Average Contract Price, per Mcf	3.81
Natural Gas | 2015 | Basin Specific Swaps - San Juan
Derivative [Line Items]
Total Hedged Volumes	12,000,000
Average Contract Price, per Mcf	4.05
Crude Oil | 2014 | NYMEX Swaps
Derivative [Line Items]
Total Hedged Volumes	7,392,000
Average Contract Price, per Bbl	92.65
Crude Oil | 2015 | NYMEX Swaps
Derivative [Line Items]
Total Hedged Volumes	7,260,000
Average Contract Price, per Bbl	89.07