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Divestitures - Gulf Properties Disposal - Revenue and Expense Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Disposal, Revenue and Expense Information        
Revenues $ 180,152 $ 394,107 $ 625,067 $ 1,211,877
Expenses $ 1,239,885 $ 137,616 $ 4,308,339 995,637
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Gulf Properties        
Disposal, Revenue and Expense Information        
Revenues [1]       90,920
Expenses [1]       $ 63,674
[1] Includes revenues and expenses through February 25, 2014, the date of the sale.