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Tenant and Other Receivables: (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Mar. 17, 2014
Components of tenant and other receivables, net      
Allowance for doubtful accounts $ 3,072,000 $ 3,234,000  
Deferred rent receivables due to straight-line rent adjustments 60,790,000 57,278,000  
Accrued percentage rents      
Components of tenant and other receivables, net      
Accounts receivable 10,940,000 $ 13,436,000  
Note receivable, 6.5% interest, maturing March 17, 2018      
Components of tenant and other receivables, net      
Notes receivable interest rate (as a percent)     6.50%
Notes receivable $ 6,351,000   $ 6,500,000
Note Receivable, 5% interest, maturing December 31, 2014      
Components of tenant and other receivables, net      
Notes receivable interest rate (as a percent)     5.00%
Notes receivable     $ 3,103,000