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Derivatives - Open Commodity Derivative Contracts (Details)
3 Months Ended
Mar. 31, 2014
MBbls
April 2014 - December 2014 | Oil Price Swaps
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 2,936
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 99.45
April 2014 - December 2014 | Natural Gas Price Swaps
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 38,490
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 4.27
April 2014 - December 2014 | Oil Collars - Three Way
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 6,066
April 2014 - December 2014 | Natural Gas Collars
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 706
Collar Range, minimum 4.00
Collar Range, maximum 7.78
April 2014 - December 2014 | Sold Put | Oil Collars - Three Way
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, minimum 70.00
April 2014 - December 2014 | Purchased Put | Oil Collars - Three Way
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, minimum 90.21
April 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) 5,314
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 92.55
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) 2,920
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 73.13
January 2015 - December 2015 | Purchased Put | Oil Collars - Three Way
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, minimum 90.82
January 2015 - December 2015 | Sold Call | Oil Collars - Three Way
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, maximum 103.13