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Derivatives - Open Commodity Derivative Contracts (Details)
Dec. 31, 2012
MBbls
Oil | Price swaps | January 2013 - December 2013
 
Derivative [Line Items]  
Notional (Oil in MBbl/Natural Gas in MMcf) 18,515
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 96.24
Oil | Price swaps | January 2014 - December 2014
 
Derivative [Line Items]  
Notional (Oil in MBbl/Natural Gas in MMcf) 7,511
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 92.43
Oil | Price swaps | January 2015 - December 2015
 
Derivative [Line Items]  
Notional (Oil in MBbl/Natural Gas in MMcf) 5,076
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 83.69
Oil | Basis Swaps | January 2013 - December 2013
 
Derivative [Line Items]  
Notional (Oil in MBbl/Natural Gas in MMcf) 543
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 13.83
Oil | Two-Way Collars | January 2013 - December 2013
 
Derivative [Line Items]  
Notional (Oil in MBbl/Natural Gas in MMcf) 168
Floor rate 80.00
Cap rate 102.50
Oil | Three-Way Collars | January 2014 - December 2014
 
Derivative [Line Items]  
Notional (Oil in MBbl/Natural Gas in MMcf) 8,213
Oil | Three-Way Collars | January 2015 - December 2015
 
Derivative [Line Items]  
Notional (Oil in MBbl/Natural Gas in MMcf) 2,920
Oil | Three-Way Collars | Sold call [Member] | January 2014 - December 2014
 
Derivative [Line Items]  
Cap rate 100.00
Oil | Three-Way Collars | Sold call [Member] | January 2015 - December 2015
 
Derivative [Line Items]  
Cap rate 103.13
Oil | Three-Way Collars | Sold put | January 2014 - December 2014
 
Derivative [Line Items]  
Floor rate 70.00
Oil | Three-Way Collars | Sold put | January 2015 - December 2015
 
Derivative [Line Items]  
Floor rate 73.13
Oil | Three-Way Collars | Purchased put | January 2014 - December 2014
 
Derivative [Line Items]  
Floor rate 90.20
Oil | Three-Way Collars | Purchased put | January 2015 - December 2015
 
Derivative [Line Items]  
Floor rate 90.82
Natural Gas | Collars | January 2013 - December 2013
 
Derivative [Line Items]  
Notional (Oil in MBbl/Natural Gas in MMcf) 6,858
Floor rate 3.78
Cap rate 6.71
Natural Gas | Collars | January 2014 - December 2014
 
Derivative [Line Items]  
Notional (Oil in MBbl/Natural Gas in MMcf) 937
Floor rate 4.00
Cap rate 7.78
Natural Gas | Collars | January 2015 - December 2015
 
Derivative [Line Items]  
Notional (Oil in MBbl/Natural Gas in MMcf) 1,010
Floor rate 4.00
Cap rate 8.55