Derivative Commodity - Reclassification (Details)	3 Months Ended
	Mar. 31, 2015 bbl
Production Period, Year One | NYMEX Swaps | Crude Oil
Derivatives, Fair Value [Line Items]
Total Hedged Volumes	6,210,000
Average contract price	89.30
Production Period, Year One | WTS/WTI Basis Swaps | Crude Oil
Derivatives, Fair Value [Line Items]
Total Hedged Volumes	1,620,000
Average contract price	(4.30)
Production Period, Year One | WTI/WTI Basis Swaps | Crude Oil
Derivatives, Fair Value [Line Items]
Total Hedged Volumes	5,670,000
Average contract price	(4.55)
Production Period, Year One | Basin Specific Swaps, San Juan | Natural Gas
Derivatives, Fair Value [Line Items]
Total Hedged Volumes	15,300,000.0
Average contract price ($ per Mcf)	4.14
Production Period, Year One | Basin Specific Swaps - Permain | Natural Gas
Derivatives, Fair Value [Line Items]
Total Hedged Volumes	4,500,000.0
Average contract price ($ per Mcf)	4.20
Production Period, Year Two | WTS/WTI Basis Swaps | Crude Oil
Derivatives, Fair Value [Line Items]
Total Hedged Volumes	720,000
Average contract price	(2.00)
Production Period, Year Two | WTI/WTI Basis Swaps | Crude Oil
Derivatives, Fair Value [Line Items]
Total Hedged Volumes	2,520,000
Average contract price	(2.27)