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Divestitures - Permian Properties Disposal - Revenue and Expense Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Disposal, Revenue and Expense Information    
Revenues $ 443,056 $ 511,690
Direct operating expenses 134,804 170,060
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.