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Divestitures - Gulf 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    
Total revenues $ 443,056 $ 511,690
Expenses 517,065 871,216
Gulf Properties
    
Disposal, Revenue and Expense Information    
Total revenues 90,920 [1] 175,055
Expenses $ 63,674 [1] $ 129,169
[1] Includes revenues and expenses through February 25, 2014, the date of the sale.