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Acquisitions and Divestitures (CCA PPA) (Details) (Cedar Creek Anticline [Member], USD $)
In Thousands, unless otherwise specified
0 Months Ended
Mar. 27, 2013
Cedar Creek Anticline [Member]
 
Business Acquisition [Line Items]  
Cash consideration $ 1,001,707 [1]
Proved properties 783,507
Unevaluated properties 222,820
Other assets 2,589
Asset retirement obligations (7,209)
Fair value of net assets acquired $ 1,001,707
[1] See Note 6, Income Taxes, for additional information regarding the like-kind-exchange transaction utilized to fund this purchase and Note 13, Supplemental Cash Flow Information, for supplemental cash flow information regarding the cash payment.