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Divestitures - Permian Properties Disposal - Revenue and Expense Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Disposal, Revenue and Expense Information        
Revenues $ 374,714 $ 512,987 $ 817,770 $ 1,024,677
Direct operating expenses 90,061 176,903 224,884 346,963
Permian Properties
        
Disposal, Revenue and Expense Information        
Revenues       68,027 [1]
Direct operating expenses       $ 17,453 [1]
[1] Includes revenues and direct operating expenses through February 26, 2013, the date of sale.