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Noncash Investing and Financing Activities (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Other Significant Noncash Transactions [Line Items]    
Accrued dividends and distributions payable $ 50,511 $ 47,546
Additions to real estate assets accrued but not yet paid 16,232 30,517
Trade-in allowance - aircraft 0 2,800
Citadel Mall [Member]
   
Other Significant Noncash Transactions [Line Items]    
Transfer of entity in settlement of mortgage debt obligation, net 43,932 0
Chapel Hill Mall [Member]
   
Other Significant Noncash Transactions [Line Items]    
Transfer of entity in settlement of mortgage debt obligation, net 18,259 0
Notes Receivable [Member] | Lakeshore Mall [Member]
   
Other Significant Noncash Transactions [Line Items]    
Notes receivable from sale of Lakeshore Mall $ 10,000 $ 0