Commodity Derivative Contracts (Commodity Derivatives Outstanding Table) (Details)	Dec. 31, 2014
Year 2015 [Member] | Collar [Member] | NYMEX [Member] | Natural Gas Contracts [Member]
Derivative [Line Items]
Volume per day	8,000
Derivative, Floor Price	4.00
Derivative, Cap Price	4.53
Weighted average floor price	4.00
Weighted average ceiling price	4.51
Year 2015 [Member] | Q1 [Member] | Swap [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	14,000
Derivative, Floor Price	90.00
Derivative, Cap Price	90.30
Weighted average swap price	90.06
Weighted average sold put price	65.21
Year 2015 [Member] | Q1 [Member] | Swap [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	16,000
Derivative, Floor Price	93.20
Derivative, Cap Price	94.00
Weighted average swap price	93.63
Weighted average sold put price	68.00
Year 2015 [Member] | Q1 [Member] | Collar [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	24,000
Derivative, Floor Price	80.00
Derivative, Cap Price	100.90
Weighted average floor price	80.00
Weighted average ceiling price	96.75
Year 2015 [Member] | Q1 [Member] | Collar [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	4,000
Derivative, Floor Price	85.00
Derivative, Cap Price	102.20
Weighted average floor price	85.00
Weighted average ceiling price	102.10
Year 2015 [Member] | Q2 [Member] | Swap [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	8,000
Derivative, Floor Price	90.00
Derivative, Cap Price	90.00
Weighted average swap price	90.00
Weighted average sold put price	65.75
Year 2015 [Member] | Q2 [Member] | Swap [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	16,000
Derivative, Floor Price	93.20
Derivative, Cap Price	94.00
Weighted average swap price	93.65
Weighted average sold put price	68.00
Year 2015 [Member] | Q2 [Member] | Collar [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	30,000
Derivative, Floor Price	80.00
Derivative, Cap Price	95.25
Weighted average floor price	80.00
Weighted average ceiling price	94.72
Year 2015 [Member] | Q2 [Member] | Collar [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	4,000
Derivative, Floor Price	85.00
Derivative, Cap Price	102.50
Weighted average floor price	85.00
Weighted average ceiling price	101.75
Year 2015 [Member] | Q3 [Member] | Swap [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	10,000
Derivative, Floor Price	90.00
Derivative, Cap Price	90.10
Weighted average swap price	90.02
Weighted average sold put price	65.30
Year 2015 [Member] | Q3 [Member] | Swap [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	16,000
Derivative, Floor Price	93.20
Derivative, Cap Price	94.00
Weighted average swap price	93.65
Weighted average sold put price	68.00
Year 2015 [Member] | Q3 [Member] | Collar [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	28,000
Derivative, Floor Price	80.00
Derivative, Cap Price	95.25
Weighted average floor price	80.00
Weighted average ceiling price	95.05
Year 2015 [Member] | Q3 [Member] | Collar [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	4,000
Derivative, Floor Price	85.00
Derivative, Cap Price	100.00
Weighted average floor price	85.00
Weighted average ceiling price	99.50
Year 2015 [Member] | Q4 [Member] | Swap [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	12,000
Derivative, Floor Price	91.15
Derivative, Cap Price	94.00
Weighted average swap price	92.42
Weighted average sold put price	68.00
Year 2015 [Member] | Q4 [Member] | Swap [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	8,000
Derivative, Floor Price	93.80
Derivative, Cap Price	96.50
Weighted average swap price	94.94
Weighted average sold put price	68.00
Year 2015 [Member] | Q4 [Member] | Three-way Collar [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	10,000
Derivative, Floor Price	85.00
Derivative, Cap Price	102.00
Weighted average sold put price	68.00
Weighted average floor price	85.00
Weighted average ceiling price	99.00
Year 2015 [Member] | Q4 [Member] | Three-way Collar [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	8,000
Derivative, Floor Price	88.00
Derivative, Cap Price	104.25
Weighted average sold put price	68.00
Weighted average floor price	88.00
Weighted average ceiling price	100.99
Year 2016 [Member] | Q1 [Member] | Swap [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	12,000
Derivative, Floor Price	90.65
Derivative, Cap Price	93.35
Weighted average swap price	92.43
Weighted average sold put price	68.00
Year 2016 [Member] | Q1 [Member] | Swap [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	8,000
Derivative, Floor Price	93.70
Derivative, Cap Price	95.45
Weighted average swap price	94.81
Weighted average sold put price	68.50
Year 2016 [Member] | Q1 [Member] | Three-way Collar [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	10,000
Derivative, Floor Price	85.00
Derivative, Cap Price	101.25
Weighted average sold put price	68.00
Weighted average floor price	85.00
Weighted average ceiling price	99.85
Year 2016 [Member] | Q1 [Member] | Three-way Collar [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	6,000
Derivative, Floor Price	88.00
Derivative, Cap Price	103.15
Weighted average sold put price	68.00
Weighted average floor price	88.00
Weighted average ceiling price	102.10
Year 2016 [Member] | Q2 [Member] | Swap [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	2,000
Derivative, Floor Price	90.35
Derivative, Cap Price	90.35
Weighted average swap price	90.35
Weighted average sold put price	68.00
Year 2016 [Member] | Q2 [Member] | Swap [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	6,000
Derivative, Floor Price	93.30
Derivative, Cap Price	93.50
Weighted average swap price	93.38
Weighted average sold put price	70.00
Year 2016 [Member] | Q2 [Member] | Three-way Collar [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	2,000
Derivative, Floor Price	85.00
Derivative, Cap Price	95.50
Weighted average sold put price	68.00
Weighted average floor price	85.00
Weighted average ceiling price	95.50
Year 2016 [Member] | Q2 [Member] | Three-way Collar [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	2,000
Derivative, Floor Price	88.00
Derivative, Cap Price	98.25
Weighted average sold put price	70.00
Weighted average floor price	88.00
Weighted average ceiling price	98.25