LONG-TERM DEBT - Mortgage Notes Payable (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
property
Jul. 12, 2021
property
Jun. 30, 2021
property
Long-term debt      
Face amount of debt $ 191,500    
Interest rate 2.30%    
Number of lease properties acquired | property 10 1 9
Mortgage Note Payable - CMBS Portfolio      
Long-term debt      
Face amount of debt $ 30,000    
Interest rate 4.33%    
Mortgage Note Payable - CMBS Portfolio | Unrelated Third Party      
Long-term debt      
Number of lease properties acquired | property 2    
Aggregate notes payable $ 1,600