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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Change in Depreciable Lives of Real Estate Assets and Real Estate Held For Sale (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2017
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
property
$ / shares
Dec. 31, 2019
USD ($)
property
$ / shares
Apr. 30, 2018
USD ($)
$ / shares
Real Estate Properties [Line Items]                          
Net Income (Loss) Available to Common Stockholders, Basic   $ 5,985 $ (18,021) $ 5,387 $ 8,439 $ (46,953) $ (29,891) $ (1,407) $ 6,403 $ 8,945 $ 1,790 $ (71,848) $ (104,562)
NET EARNINGS (LOSS) PER COMMON SHARE – BASIC | $ / shares                   $ 0.75 $ 0.15 $ (6.06) $ (8.71)
Number of year after date of acquisition related to adjustment of real estate preliminary allocations of purchase price                     1 year    
Assets Held for Sale                          
Real Estate Properties [Line Items]                          
Number of real estate properties classified as held for sale | property                     0 0  
Service Life                          
Real Estate Properties [Line Items]                          
Depreciation                         $ 29,300
Net Income (Loss) Available to Common Stockholders, Basic                         $ 29,300
NET EARNINGS (LOSS) PER COMMON SHARE – BASIC | $ / shares                         $ 0.22
Service Life | Property With Previous Nine Year Life                          
Real Estate Properties [Line Items]                          
Useful life 9 years                        
Minimum | Service Life                          
Real Estate Properties [Line Items]                          
Useful life 20 years                 10 years      
Minimum | Service Life | Property With Previous Nine Year Life                          
Real Estate Properties [Line Items]                          
Useful life                   5 years      
Maximum | Service Life                          
Real Estate Properties [Line Items]                          
Useful life 40 years                 37 years      
Maximum | Service Life | Property With Previous Nine Year Life                          
Real Estate Properties [Line Items]                          
Useful life                   10 years