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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Basis of accounting and principles of combination and consolidation    
Maximum cash amount insured at several financial institutions $ 250,000 $ 250,000
Unamortized debt issuance costs 7,600,000 9,400,000
Other Assets    
Basis of accounting and principles of combination and consolidation    
Tenant security deposits $ 27,600,000 $ 24,400,000