Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments - Open Commodity Derivatives (Details)

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Derivative Financial Instruments - Open Commodity Derivatives (Details) (2014: 4th Quarter, Swaps - Oil)
9 Months Ended
Sep. 30, 2014
Derivatives Fair Value [Line Items]  
Termination Period 4th Quarter
Ice Brent Crude Oil Futures
 
Derivatives Fair Value [Line Items]  
Notional Quantity (Bbls) 156,400
Weighted Average Contract Price 97.37
Nymex Crude Oil Futures
 
Derivatives Fair Value [Line Items]  
Notional Quantity (Bbls) 460,000
Weighted Average Contract Price 98.12