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Divestitures - Gulf 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
Expenses 324,180 426,529 841,245 1,297,745
Gulf Properties
        
Disposal, Revenue and Expense Information        
Revenues   170,219 90,920 [1] 345,275
Expenses   $ 122,222 $ 63,674 [1] $ 251,392
[1] Includes revenues and expenses through February 25, 2014, the date of the sale.