INCOME PROPERTY PORTFOLIO - Properties Acquired - General Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 21, 2021
USD ($)
property
Sep. 25, 2020
USD ($)
property
Sep. 30, 2021
USD ($)
property
Sep. 30, 2020
USD ($)
property
Sep. 30, 2021
USD ($)
property
Sep. 30, 2020
USD ($)
property
Dec. 31, 2020
USD ($)
INCOME PROPERTY PORTFOLIO              
Gain on sale     $ 544 $ 287 $ 544 $ 287  
Number of real estate properties | property     89 89 89 89  
Purchase price         $ 14,800    
Acquired intangible liabilities for the below market lease     $ 4,998   $ 4,998   $ 3,299
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Single Tenant Net Lease Income Property, Outback Steakhouse, Huntersville, North Carolina              
INCOME PROPERTY PORTFOLIO              
Number of real estate properties disposed | property 1            
Sales price $ 3,800            
Gain on sale $ 500            
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Single-tenant Net Lease Income Property, Outback Steakhouse, Charlottesville, Virginia              
INCOME PROPERTY PORTFOLIO              
Number of real estate properties disposed | property   1          
Sales price   $ 5,100          
Gain on sale   $ 300          
Single-tenant Net Lease Income Properties Acquired in 2021              
INCOME PROPERTY PORTFOLIO              
Number of real estate properties | property     42   42    
Purchase price         $ 158,664    
Acquired properties, cost     $ 160,000   160,000    
Initial cost of land     52,100   52,100    
Initial cost of building and improvements     89,600   89,600    
Acquired in-place lease value, leasing fees, and above market lease value     20,500   20,500    
Acquired intangible liabilities for the below market lease     $ 2,200   $ 2,200    
Weighted average amortization period of intangible liabilities         8 years 4 months 24 days    
Single-tenant Net Lease Income Properties Acquired in 2020              
INCOME PROPERTY PORTFOLIO              
Number of real estate properties | property       26   26  
Purchase price           $ 99,282  
Acquired properties, cost       $ 100,300   100,300  
Initial cost of land       25,800   25,800  
Initial cost of building and improvements       59,700   59,700  
Acquired in-place lease value, leasing fees, and above market lease value       16,100   16,100  
Acquired intangible liabilities for the below market lease       $ 1,300   $ 1,300  
Weighted average amortization period of intangible liabilities           10 years 2 months 12 days