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Acquisitions and Divestitures (Thompson Field PPA) (Details 2) (USD $)
In Thousands, unless otherwise specified
1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2012
Thompson Field [Member]
Business Acquisition [Line Items]        
Cash consideration       $ 366,179 [1]
Proved properties       305,233
Unevaluated properties       12,023
Pipelines and plants       2,000
Other assets       2,957
Asset retirement obligations       (3,306)
Fair value of net assets acquired       318,907
Goodwill $ 1,283,590 $ 1,283,590 $ 1,236,318 $ 47,272
[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.