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Acquisitions and Divestitures - Permian Properties Disposal - Revenue and Expense Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Disposal, Revenue and Expense Information        
Revenues $ 493,603 $ 532,798 $ 1,518,280 $ 1,392,867
Direct operating expenses 152,669 176,715 499,093 458,701
Permian Properties
        
Disposal, Revenue and Expense Information        
Revenues   143,347 68,027 [1] 438,742
Direct operating expenses   $ 27,603 $ 17,453 [1] $ 92,884
[1] Includes revenues and direct operating expenses through February 26, 2013, the date of sale.