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Derivatives - Open Commodity Derivative Contracts (Details)
6 Months Ended
Jun. 30, 2014
MBbls
July 2014 - December 2014 | Oil Price Swaps
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 2,054
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 99.08
July 2014 - December 2014 | Natural Gas Price Swaps
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 24,840
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 4.28
July 2014 - December 2014 | Oil Collars - Three Way
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 4,140
July 2014 - December 2014 | Natural Gas Collars
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 472
Collar Range, minimum 4.00
Collar Range, maximum 7.78
July 2014 - December 2014 | Sold Put | Oil Collars - Three Way
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, minimum 70.00
July 2014 - December 2014 | Purchased Put | Oil Collars - Three Way
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, minimum 90.20
July 2014 - December 2014 | Sold Call | Oil Collars - Three Way
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, maximum 100.00
January 2015 - December 2015 | Oil Price Swaps
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 5,588
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 92.44
January 2015 - December 2015 | Natural Gas Price Swaps
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 15,400
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 4.50
January 2015 - December 2015 | Oil Collars - Three Way
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 3,656
January 2015 - December 2015 | Natural Gas Collars
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 1,010
Collar Range, minimum 4.00
Collar Range, maximum 8.55
January 2015 - December 2015 | Sold Put | Oil Collars - Three Way
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, minimum 74.83
January 2015 - December 2015 | Purchased Put | Oil Collars - Three Way
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, minimum 90.35
January 2015 - December 2015 | Sold Call | Oil Collars - Three Way
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, maximum 103.50