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Acquisitions and Dispositions (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Jul. 20, 2011
May 31, 2011
Acquisitions and Dispositions     
Purchase price for acquisition of intangible asset  $ 1.5  
Net payment for sale of properties  2.8  
Percentage of proved reserves sold to a third party  12.00%  
Percentage of proved reserves sold in a single transaction    79.00%
Base sale price of oil and gas properties    222.3
Asset retirement obligations associated with sold properties    72.7
Net proceeds from sale of oil and gas properties    173.3
Buyer's prepayment on sale of properties    11.1
Recorded amount of net gain on sale of properties    58.1
Employee retention and incentive benefits paid in connection with sale of properties 2.7   
Percentage of proved reserves sold, current period3.00%    
Gross purchase price for significant asset   62.8 
Portion of purchase price held in escrow   $ 20.8