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Derivatives (Schedule of Derivatives Outstanding) (Details)
 6 Months Ended
Jun. 30, 2016
$ / Unit
MMBTU
bbl
Swap [Member] | Jul'16 - Sep'16 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]  
Derivative [Line Items]  
Weighted average price 48.45
Hedged volume (Bbl/day) | bbl 1,000
Swap [Member] | Jul'16 - Dec'16 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]  
Derivative [Line Items]  
Weighted average price 2.596
Hedged volume (MMBtu/day) | MMBTU 45,000
Swap [Member] | Jan'17 - Dec'17 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]  
Derivative [Line Items]  
Weighted average price 2.960
Hedged volume (MMBtu/day) | MMBTU 60,000
Swap [Member] | Jan'18 - Dec'18 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]  
Derivative [Line Items]  
Weighted average price 3.025
Hedged volume (MMBtu/day) | MMBTU 10,000
Basis swap [Member] | Jan'17 - Dec'17 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]  
Derivative [Line Items]  
Weighted average price (0.215)
Hedged volume (MMBtu/day) | MMBTU 20,000
Basis swap [Member] | Jan'18 - Dec'18 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]  
Derivative [Line Items]  
Weighted average price (0.208)
Hedged volume (MMBtu/day) | MMBTU 10,000
Collar [Member] | Jul'16 - Sep'16 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]  
Derivative [Line Items]  
Hedged volume (Bbl/day) | bbl 2,450
Cap Price 52.46
Floor Price 44.44
Collar [Member] | Jul'16 - Dec'16 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]  
Derivative [Line Items]  
Hedged volume (MMBtu/day) | MMBTU 42,000
Cap Price 2.88
Floor Price 2.40
Collar [Member] | Oct'16 - Dec'16 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]  
Derivative [Line Items]  
Hedged volume (Bbl/day) | bbl 1,450
Cap Price 56.40
Floor Price 47.50
Collar [Member] | Jan'17 - Oct'17 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]  
Derivative [Line Items]  
Hedged volume (MMBtu/day) | MMBTU 10,000
Cap Price 2.95
Floor Price 2.75
Three-way collar [Member] | Jul'16 - Dec'16 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]  
Derivative [Line Items]  
Hedged volume (Bbl/day) | bbl 700
Cap Price 57
Subfloor price 35
Floor Price 46.50
Three-way collar [Member] | Jul'16 - Dec'16 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]  
Derivative [Line Items]  
Hedged volume (MMBtu/day) | MMBTU 13,500
Cap Price 3.26
Subfloor price 2.20
Floor Price 2.70
Three-way collar [Member] | Jan'17 - Dec'17 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]  
Derivative [Line Items]  
Hedged volume (Bbl/day) | bbl 750
Cap Price 63.90
Subfloor price 37.50
Floor Price 50.00
Three-way collar [Member] | Jan'17 - Dec'17 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]  
Derivative [Line Items]  
Hedged volume (MMBtu/day) | MMBTU 15,000
Cap Price 3.32
Subfloor price 2
Floor Price 2.50
Derivative premium [Member] | Three-way collar [Member] | Jul'16 - Dec'16 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]  
Derivative [Line Items]  
Hedged volume (Bbl/day) | bbl 700 [1]
Cap Price 63.50 [1]
Subfloor price 35 [1]
Floor Price 47.50 [1]
[1] We pay our counterparty a premium, which can be and is being deferred until settlement.