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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred Financing Costs (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Unamortized deferred financing costs $ 16,148,000 $ 15,963,000  
Amortization expense 7,000,000 6,120,000 $ 5,918,000
Accumulated amortization of deferred financing costs 17,175,000 22,098,000  
Intangible Lease Assets And Other Assets      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Unamortized deferred financing costs 9,062,000 2,005,000  
Mortgage and Other Indebtedness, Net      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Unamortized deferred financing costs $ 16,148,000 $ 15,963,000