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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 30, 2018
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash $ 6,918 $ 19,538 $ 5,464 $ 4,225
Real Estate Deposits for Property Acquisition        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 5,000      
Escrow Deposits        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash $ 1,900