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INVESTMENT IN REAL ESTATE PROPERTIES - Investment in Unconsolidated Joint Venture Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
property
Jun. 30, 2021
USD ($)
Dec. 31, 2023
USD ($)
property
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
USD ($)
property
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2023
CAD ($)
property
Dec. 31, 2022
CAD ($)
property
Schedule of Equity Method Investments [Line Items]                  
Investment in unconsolidated joint ventures $ 134,962,000   $ 136,843,000   $ 134,962,000        
Other-than-temporary impairment of unconsolidated joint ventures     0   57,778,000   $ 164,126,000    
Marlin Spring Joint Venture                  
Schedule of Equity Method Investments [Line Items]                  
Investment in unconsolidated joint ventures 14,693,000   $ 17,119,000   14,693,000        
Equity interest in joint venture     85.00%         85.00%  
Sienna Joint Venture                  
Schedule of Equity Method Investments [Line Items]                  
Investment in unconsolidated joint ventures 120,269,000   $ 119,724,000   120,269,000        
Equity interest in joint venture     50.00%         50.00%  
Enlivant Joint Venture                  
Schedule of Equity Method Investments [Line Items]                  
Equity interest in joint venture   49.00%              
Other-than-temporary impairment of unconsolidated joint ventures 57,800,000 $ 164,100,000 $ 0   $ 57,778,000   $ 164,126,000    
Equity interest, investment basis amount $ 0                
Senior Housing - Managed | Marlin Spring Joint Venture                  
Schedule of Equity Method Investments [Line Items]                  
Number of acquired properties | property 3   1   3     1 3
Payments to acquire buildings       $ 30.0   $ 82.5      
Investment in unconsolidated joint ventures               $ 6.1 $ 16.6
Senior Housing - Managed | Marlin Spring Joint Venture | Marlin Spring Joint Venture                  
Schedule of Equity Method Investments [Line Items]                  
Debt assumed               $ 23.6 $ 65.0
Senior Housing - Managed | Sienna Joint Venture                  
Schedule of Equity Method Investments [Line Items]                  
Number of acquired properties | property 12       12       12
Payments to acquire buildings           $ 379.0      
Investment in unconsolidated joint ventures                 $ 161.8
Senior Housing - Managed | Sienna Joint Venture | Sienna Senior Living                  
Schedule of Equity Method Investments [Line Items]                  
Debt assumed                 $ 53.4