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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Deferred Financing Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Unamortized deferred financing costs $ 18,938 $ 17,855  
Amortization expense 5,918 5,010 $ 7,116
Accumulated amortization 16,269 13,370  
Intangible lease assets and other assets      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Unamortized deferred financing costs 3,301 4,890  
Mortgage and Other Indebtedness | Adjustments for New Accounting Pronouncement      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Unamortized deferred financing costs $ 18,938 $ 17,855