Derivative Commodity - Reclassification (Details)	9 Months Ended
	Sep. 30, 2015 Mcf bbl $ / Mcf $ / bbl
2015 | NYMEX Swaps | Crude Oil
Derivatives, Fair Value [Line Items]
Total Hedged Volumes	3,513,000
Average Contract Price | $ / bbl	78.28
2015 | WTS/WTI Basis Swaps | Crude Oil
Derivatives, Fair Value [Line Items]
Total Hedged Volumes	540,000
Average Contract Price | $ / bbl	(4.30)
2015 | WTI/WTI Basis Swaps | Crude Oil
Derivatives, Fair Value [Line Items]
Total Hedged Volumes	1,890,000
Average Contract Price | $ / bbl	(4.55)
2015 | Basin Specific Swaps - San Juan | Natural Gas
Derivatives, Fair Value [Line Items]
Total Hedged Volumes | Mcf	5,500,000.0
Average contract price (dollars per Mcf) | $ / Mcf	4.14
2015 | Basin Specific Swaps - Permian | Natural Gas
Derivatives, Fair Value [Line Items]
Total Hedged Volumes | Mcf	1,500,000.0
Average contract price (dollars per Mcf) | $ / Mcf	4.20
2016 | NYMEX Swaps | Crude Oil
Derivatives, Fair Value [Line Items]
Total Hedged Volumes	1,086,000
Average Contract Price | $ / bbl	63.80
2016 | WTS/WTI Basis Swaps | Crude Oil
Derivatives, Fair Value [Line Items]
Total Hedged Volumes	2,117,000
Average Contract Price | $ / bbl	(1.63)
2016 | WTI/WTI Basis Swaps | Crude Oil
Derivatives, Fair Value [Line Items]
Total Hedged Volumes	7,524,000
Average Contract Price | $ / bbl	(1.92)