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Acquisitions and Divestitures - Permian Propertites Disposal - Revenue and Expense Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disposal, Revenue and Expense Information [Line Items]                      
Total revenues $ 465,108 $ 493,603 $ 512,987 $ 511,690 $ 1,338,098 $ 532,798 $ 478,434 $ 381,635 $ 1,983,388 $ 2,730,965 $ 1,415,213
Direct operating expenses                 682,830 1,431,672 498,563
Permian Properties
                      
Disposal, Revenue and Expense Information [Line Items]                      
Total revenues                 68,027 [1] 566,075 614,666
Direct operating expenses                 $ 17,453 [1] $ 130,337 $ 144,066
[1] Includes revenues and direct operating expenses through February 26, 2013, the date of sale.