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Mortgage and Other Indebtedness (Variable Rate Loans Repaid) (Details)
$ in Thousands
1 Months Ended
Jul. 31, 2015
loan
May. 31, 2015
USD ($)
Subsequent Event    
Debt Instrument [Line Items]    
Number of loans retired 4  
Imperial Valley Mall    
Debt Instrument [Line Items]    
Interest rate at repayment date (as a percent)   4.99%
Principal Balance Repaid | $   $ 49,486