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Acquisitions and Divestitures - Permian Properties Disposal - Revenue and Expense Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Disposal, Revenue and Expense Information        
Revenues $ 512,987 $ 478,434 $ 1,024,677 $ 860,069
Direct operating expenses 176,903 161,282 346,963 282,361
Permian Properties
        
Disposal, Revenue and Expense Information        
Revenues   133,630 68,027 [1] 295,395
Direct operating expenses   $ 29,291 $ 17,453 [1] $ 65,281
[1] Includes revenues and direct operating expenses through February 26, 2013, the date of sale.