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INVESTMENTS IN REAL ESTATE PROPERTIES (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
property
Sep. 30, 2021
USD ($)
property
Sep. 30, 2022
USD ($)
property
Sep. 30, 2021
USD ($)
property
Real Estate Properties [Line Items]        
Weighted-average amortization period of acquired finite-lived intangible assets     5 years 2 months 12 days  
Proceeds from disposition of real estate property | $     $ 274,816 $ 141,360
Gain on sale of real estate property | $ $ 11,303 $ 25,979 94,827 53,321
Impairment of real estate property | $ $ 0 $ 0 $ 0 $ 758
Disposed of by Sale | Office properties        
Real Estate Properties [Line Items]        
Number of real estate properties | property 1 2 1 2
Disposed of by Sale | Retail properties        
Real Estate Properties [Line Items]        
Number of real estate properties | property 6 1 6 1
Disposed of by Sale | Retail properties | Retail Property, Greater Boston Market        
Real Estate Properties [Line Items]        
Impairment of real estate property | $       $ 800
Disposed of by Sale | Retail land parcel        
Real Estate Properties [Line Items]        
Number of real estate properties | property 1   1  
Disposed of by Sale | Industrial properties        
Real Estate Properties [Line Items]        
Number of real estate properties | property   1   1