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CONCENTRATION OF CREDIT RISK - Triple-Net Leased Properties (Details)
$ in Millions
3 Months Ended
Apr. 26, 2018
USD ($)
period
Lease
Mar. 31, 2018
property
Mar. 31, 2017
Kindred | Medical Office Buildings      
Concentration Risk      
Number of MOB properties included in our office operations reportable business segment   1  
Brookdale Senior Living      
Concentration Risk      
Number of senior housing community included in senior living operations   1  
Revenue from Rights Concentration Risk | Revenues | Brookdale Senior Living      
Concentration Risk      
Concentration percentage   4.60% 4.70%
Revenue from Rights Concentration Risk | Revenues | Ardent      
Concentration Risk      
Concentration percentage   3.00% 3.10%
Revenue from Rights Concentration Risk | Revenues | Kindred      
Concentration Risk      
Concentration percentage   3.40% 5.00%
Revenue from Rights Concentration Risk | NOI | Brookdale Senior Living      
Concentration Risk      
Concentration percentage   8.10% 8.20%
Revenue from Rights Concentration Risk | NOI | Ardent      
Concentration Risk      
Concentration percentage   5.40% 5.30%
Revenue from Rights Concentration Risk | NOI | Kindred      
Concentration Risk      
Concentration percentage   6.10% 8.70%
Subsequent Event | Brookdale Senior Living      
Concentration Risk      
Master leases | Lease 1    
Renewal options | period 2    
Lease renewal option term 10 years    
Non-cash expense | $ $ 22