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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for Tenant Receivables      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision for doubtful accounts $ 2,254 $ 2,643 $ 1,253