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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments in Real Estate (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Investments in Real Estate      
Impairment of real estate $ 0 $ 2,800 $ 66,200
Buildings and improvements | Minimum      
Investments in Real Estate      
Estimated useful lives 15 years    
Buildings and improvements | Maximum      
Investments in Real Estate      
Estimated useful lives 40 years    
Furniture, fixtures, and equipment | Minimum      
Investments in Real Estate      
Estimated useful lives 3 years    
Furniture, fixtures, and equipment | Maximum      
Investments in Real Estate      
Estimated useful lives 5 years