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Derivative Financial Instruments Gains and Losses (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Unrealized and realized gain and loss from derivative cash settlements and changes in fair value of derivative contracts      
Realized hedge gain/loss $ (20,707) $ 23,465 $ 140,648
Unrealized and Realized Derivative (Gain) Loss (37,086) 8,899 20,469
Other Comprehensive Income (Loss), Change in Derivative Fair Value, Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 0 16,811 (35,977)
Cash settlement (gain) and loss 25,671    
Unrealized (gain) loss on changes in fair value 62,757    
Amount of (gain) loss reclassified from AOCL to realized hedge gain (loss) 12,997 6,641 (67,344)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 0 16,811 (35,977)
De-designated Hedges
     
Unrealized and realized gain and loss from derivative cash settlements and changes in fair value of derivative contracts      
Other Comprehensive Income (Loss), Change in Derivative Fair Value, Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax   16,811 (35,977)
Amount of (gain) loss reclassified from AOCL to realized hedge gain (loss) 12,997    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net   16,811 (35,977)
Oil, Natural Gas, and Natural Gas Liquid [Member]
     
Unrealized and realized gain and loss from derivative cash settlements and changes in fair value of derivative contracts      
Realized hedge gain/loss (20,707) 23,465 140,648
Crude oil
     
Unrealized and realized gain and loss from derivative cash settlements and changes in fair value of derivative contracts      
Cash settlement (gain) and loss 22,633    
Unrealized (gain) loss on changes in fair value 3,391    
Natural gas
     
Unrealized and realized gain and loss from derivative cash settlements and changes in fair value of derivative contracts      
Cash settlement (gain) and loss (10,711)    
Unrealized (gain) loss on changes in fair value 64,310    
Natural gas liquids ("NGLs")
     
Unrealized and realized gain and loss from derivative cash settlements and changes in fair value of derivative contracts      
Cash settlement (gain) and loss 13,749    
Unrealized (gain) loss on changes in fair value $ (4,944)    
Convertible Debt [Member]
     
Unrealized and realized gain and loss from derivative cash settlements and changes in fair value of derivative contracts      
Interest rate on notes (as a percent) 3.50% 3.50%