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ACQUISITIONS OF REAL ESTATE PROPERTY (Narrative) (Details)
$ in Thousands
1 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
property
Sep. 30, 2019
USD ($)
property
Sep. 30, 2018
USD ($)
Business Acquisition [Line Items]      
Number of real estate properties 1,200 1,200  
Vacant land parcels acquired   1  
Payments to acquire real estate | $   $ 939,805 $ 35,800
Development Projects      
Business Acquisition [Line Items]      
Number of real estate properties 23 23  
LGM Acquisition | Le Groupe Maurice      
Business Acquisition [Line Items]      
Variable interest entity, ownership percentage 87.00%    
Number of real estate properties 34 34  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | $ $ 1,800,000 $ 1,800,000  
LGM Acquisition | Le Groupe Maurice | Development Projects      
Business Acquisition [Line Items]      
Number of real estate properties 5 5  
Other 2019 Acquisitions      
Business Acquisition [Line Items]      
Payments to acquire real estate | $   $ 217,700  
Other 2019 Acquisitions | Office Operations      
Business Acquisition [Line Items]      
Number of real estate properties 2 2  
Other 2019 Acquisitions | Office Operations | Research and Innovation Center      
Business Acquisition [Line Items]      
Number of real estate properties 1 1  
Other 2019 Acquisitions | Office Operations | Medical Office Buildings      
Business Acquisition [Line Items]      
Number of real estate properties 1 1