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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Revenues (Details) - USD ($)
 3 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 30, 2018
May 01, 2018
Disaggregation of Revenue [Line Items]                            
Retained earnings $ (427,681,000)       $ (390,196,000)         $ (427,681,000) $ (390,196,000)      
Mortgage loans receivable 24,661,000       16,140,000         24,661,000 16,140,000      
Fixed lease income - operating leases                   168,119,000 176,706,000 $ 114,047,000    
Variable lease income - operating leases                   7,068,000 5,586,000 3,528,000    
Revenues, Total $ 45,540,000 $ 44,138,000 $ 43,910,000 $ 44,406,000 $ 45,777,000 $ 47,436,000 $ 46,934,000 $ 45,608,000 $ 121,871,000 177,994,000 185,755,000 121,871,000 $ 169,745,000  
Other Property Revenue                            
Disaggregation of Revenue [Line Items]                            
Other property revenue                   $ 2,807,000 $ 3,463,000 $ 4,296,000    
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09                            
Disaggregation of Revenue [Line Items]                            
Retained earnings                           $ 627,000
Mortgage loans receivable                           $ 627,000