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Noncash Investing and Financing Activities (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Other Significant Noncash Transactions [Line Items]      
Accrued dividends and distributions payable $ 50,534,000 $ 47,546,000  
Additions to real estate assets accrued but not yet paid 14,256,000 36,755,000  
Trade-in allowance - aircraft 0 2,800,000  
Note receivable from sale of mall 40,137,000   30,424,000
Transfer of Citadel Mall in settlement of mortgage debt obligation, net 43,909,000 0  
Notes Receivable [Member]
     
Other Significant Noncash Transactions [Line Items]      
Note receivable from sale of mall 21,187,000   11,304,000
Notes Receivable [Member] | Lakeshore Mall [Member]
     
Other Significant Noncash Transactions [Line Items]      
Note receivable from sale of mall $ 10,000,000 $ 0