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Noncash Investing and Financing Activities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other Significant Noncash Transactions [Line Items]    
Accrued dividends and distributions payable $ 41,759 $ 54,394
Additions to real estate assets accrued but not yet paid 2,071 14,513
Conversion of Operating Partnership units for common stock 3,059 0
Decrease in noncontrolling interest and joint venture interest   2,231
Outlet Shoppes at Atlanta - Ridgewalk    
Other Significant Noncash Transactions [Line Items]    
Decrease in real estate assets 0 (28,218)
Decrease in mortgage and other indebtedness 0 31,953
Decrease in operating assets and liabilities 0 320
Corporate Joint Venture    
Other Significant Noncash Transactions [Line Items]    
Decrease in real estate assets 0 (9,131)
Decrease in mortgage and other indebtedness 0 2,466
Decrease in operating assets and liabilities 0 1,287
Decrease in noncontrolling interest and joint venture interest $ 0 $ 2,231