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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 |  |  |

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