Commodity Derivative Contracts (Commodity Derivatives Outstanding Table) (Details)	Dec. 31, 2013
Year 2014 [Member] | Collar [Member] | NYMEX [Member] | Natural Gas Contracts [Member]
Derivative [Line Items]
Volume per day	14,000
Derivative, Floor Price	4.00
Derivative, Cap Price	4.47
Weighted average floor price	4.00
Weighted average ceiling price	4.45
Year 2014 [Member] | Q1 [Member] | Swap [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	58,000
Derivative, Floor Price	91.67
Derivative, Cap Price	95.95
Weighted average swap price	93.53
Year 2014 [Member] | Q2 [Member] | Swap [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	58,000
Derivative, Floor Price	91.67
Derivative, Cap Price	95.95
Weighted average swap price	93.53
Year 2014 [Member] | Q3 [Member] | Swap [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	58,000
Derivative, Floor Price	90.00
Derivative, Cap Price	93.50
Weighted average swap price	92.52
Year 2014 [Member] | Q4 [Member] | Swap [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	58,000
Derivative, Floor Price	90.00
Derivative, Cap Price	93.50
Weighted average swap price	92.52
Year 2015 [Member] | Q1 [Member] | Collar [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	38,000
Derivative, Floor Price	80.00
Derivative, Cap Price	100.90
Weighted average floor price	80.00
Weighted average ceiling price	96.96
Year 2015 [Member] | Q1 [Member] | Collar [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	20,000
Derivative, Floor Price	85.00
Derivative, Cap Price	104.00
Weighted average floor price	85.00
Weighted average ceiling price	101.45
Year 2015 [Member] | Q2 [Member] | Collar [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	38,000
Derivative, Floor Price	80.00
Derivative, Cap Price	95.25
Weighted average floor price	80.00
Weighted average ceiling price	94.62
Year 2015 [Member] | Q2 [Member] | Collar [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	20,000
Derivative, Floor Price	85.00
Derivative, Cap Price	103.00
Weighted average floor price	85.00
Weighted average ceiling price	102.01
Year 2015 [Member] | Q3 [Member] | Collar [Member] | NYMEX [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	38,000
Derivative, Floor Price	80.00
Derivative, Cap Price	95.25
Weighted average floor price	80.00
Weighted average ceiling price	95.04
Year 2015 [Member] | Q3 [Member] | Collar [Member] | LLS [Member] | Crude Oil Contracts [Member]
Derivative [Line Items]
Volume per day	20,000
Derivative, Floor Price	85.00
Derivative, Cap Price	102.60
Weighted average floor price	85.00
Weighted average ceiling price	100.69