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Acquisitions and Divestitures - Permian Properties Disposal - Revenue and Expense Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Revenues $ 143,642 $ 180,152 $ 229,607 $ 215,308 $ 346,881 $ 394,107 $ 374,714 $ 443,056 $ 768,709 $ 1,558,758 $ 1,983,388
Direct operating expenses                 $ 375,354 $ 483,889 682,830
Permian Properties | Disposal Group, Disposed of by Sale, Not Discontinued Operations                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Revenues                     68,027
Direct operating expenses                     $ 17,453