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Tenant and Other Receivables, net: (Details) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Mar. 17, 2014
Components of tenant and other receivables, net      
Allowance for doubtful accounts $ 4,456,000 $ 3,234,000  
Deferred rent receivable due to straight-line rent adjustments 58,312,000 57,278,000  
Accrued percentage rents      
Components of tenant and other receivables, net      
Accounts receivable 1,163,000 13,436,000  
6.5% Note Receivable      
Components of tenant and other receivables, net      
Notes receivable $ 6,390,000 $ 6,436,000 $ 6,500,000
Note receivable, interest rate (as a percent)     6.46%
5.0% Note Receivable      
Components of tenant and other receivables, net      
Notes receivable     $ 3,103,000
Note receivable, interest rate (as a percent)     5.00%