Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments - Open Commodity Derivatives (Details)

v2.4.0.8
Derivative Financial Instruments - Open Commodity Derivatives (Details) (Swaps - Oil)
 6 Months Ended
Jun. 30, 2014
bbl
Ice Brent Crude Oil Futures
  
Derivatives Fair Value [Line Items]  
Notional Quantity (Bbls) 322,000
Weighted Average Contract Price 97.37
Nymex Crude Oil Futures
  
Derivatives Fair Value [Line Items]  
Notional Quantity (Bbls) 62,000
Weighted Average Contract Price 97.01
Argus Crude Oil Futures
  
Derivatives Fair Value [Line Items]  
Notional Quantity (Bbls) 1,288,000
Weighted Average Contract Price 97.84
2014: 3rd Quarter
  
Derivatives Fair Value [Line Items]  
Termination Period 3rd Quarter
2014: 3rd Quarter | Ice Brent Crude Oil Futures
  
Derivatives Fair Value [Line Items]  
Notional Quantity (Bbls) 165,600
Weighted Average Contract Price 97.38
2014: 3rd Quarter | Nymex Crude Oil Futures
  
Derivatives Fair Value [Line Items]  
Notional Quantity (Bbls) 62,000
Weighted Average Contract Price 97.01
2014: 3rd Quarter | Argus Crude Oil Futures
  
Derivatives Fair Value [Line Items]  
Notional Quantity (Bbls) 828,000
Weighted Average Contract Price 97.69
2014: 4th Quarter
  
Derivatives Fair Value [Line Items]  
Termination Period 4th Quarter
2014: 4th Quarter | Ice Brent Crude Oil Futures
  
Derivatives Fair Value [Line Items]  
Notional Quantity (Bbls) 156,400
Weighted Average Contract Price 97.37
2014: 4th Quarter | Argus Crude Oil Futures
  
Derivatives Fair Value [Line Items]  
Notional Quantity (Bbls) 460,000
Weighted Average Contract Price 98.12