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SUPPLEMENTAL AND NONCASH INFORMATION - Summary (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Significant Noncash Transactions [Line Items]      
Additions to real estate assets accrued but not yet paid $ 5,945 $ 24,642 $ 22,791
Accrued dividends and distributions payable     17,130
Decrease in real estate assets (57,001) (60,059)  
Decrease in mortgage and other indebtedness 85,371 124,111  
Increase (decrease) in operating assets and liabilities 4,288 9,333  
Decrease in intangible lease and other assets (137) (1,663)  
Conversion of Operating Partnership common units into shares of common stock $ 21,163 730 3,059
Deconsolidation upon contribution/assignment of interest in joint venture      
Other Significant Noncash Transactions [Line Items]      
Decrease in real estate assets   (200,343) (8,221)
Increase in investment in unconsolidated affiliates   39,708 $ 8,174
Decrease in mortgage and other indebtedness   228,627  
Increase (decrease) in operating assets and liabilities   857  
Decrease in intangible lease and other assets   (4,815)  
Increase in noncontrolling interest and joint venture interest   $ (12,013)