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Derivatives Derivatives (Schedule of Non-designated Hedges Outstanding) (Details)
12 Months Ended
Dec. 31, 2015
$ / Unit
MMBTU
bbl
Natural gas | Swap | If Nymex | Jan'16 - Dec'16  
Derivative Instruments, Gain (Loss) [Line Items]  
Non Designated Derivative Instrument Weighted Average Fixed Price For Swaps 2.625
Hedged Volume (MMBtu/day) | MMBTU 35,000
Natural gas | Collar | If Nymex | Jan'16 - Dec'16  
Derivative Instruments, Gain (Loss) [Line Items]  
Ceiling Price 2.88
Floor Price 2.40
Hedged Volume (MMBtu/day) | MMBTU 42,000
Natural gas | Three-way collar | If Nymex | Jan'16 - Dec'16  
Derivative Instruments, Gain (Loss) [Line Items]  
Ceiling Price 3.26
Subfloor Price 2.20
Floor Price 2.70
Hedged Volume (MMBtu/day) | MMBTU 13,500
Natural gas | Three-way collar | If Nymex | Jan'17 - Dec'17  
Derivative Instruments, Gain (Loss) [Line Items]  
Ceiling Price 3.32
Subfloor Price 2.00
Floor Price 2.50
Hedged Volume (MMBtu/day) | MMBTU 15,000
Crude Oil | Collar | Wti Nymex | Jan'16 - Jun'16  
Derivative Instruments, Gain (Loss) [Line Items]  
Ceiling Price 55.62
Floor Price 46.36
Hedged Volume (Bbl/day) | bbl 2,150
Crude Oil | Collar | Wti Nymex | Jul'16 - Dec'16  
Derivative Instruments, Gain (Loss) [Line Items]  
Ceiling Price 56.40
Floor Price 47.50
Hedged Volume (Bbl/day) | bbl 1,450
Crude Oil | Three-way collar | Wti Nymex | Jan'16 - Dec'16  
Derivative Instruments, Gain (Loss) [Line Items]  
Ceiling Price 57.00
Subfloor Price 35.00
Floor Price 46.50
Hedged Volume (Bbl/day) | bbl 700
Crude Oil | Three-way collar | Wti Nymex | Jul'16 - Dec'16  
Derivative Instruments, Gain (Loss) [Line Items]  
Ceiling Price 63.50 [1]
Subfloor Price 35.00 [1]
Floor Price 47.50 [1]
Hedged Volume (Bbl/day) | bbl 700 [1]
Crude Oil | Three-way collar | Wti Nymex | Jan'17 - Dec'17  
Derivative Instruments, Gain (Loss) [Line Items]  
Ceiling Price 63.90
Subfloor Price 37.50
Floor Price 50.00
Hedged Volume (Bbl/day) | bbl 750
[1] We pay our counterparty a premium, which can be and is being deferred until settlement.