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CONCENTRATION OF CREDIT RISK (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 03, 2016
Lease
Apr. 01, 2016
property
Apr. 30, 2016
USD ($)
Dec. 31, 2014
property
Jun. 30, 2016
USD ($)
board_member
property
state
province
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
board_member
property
state
province
Jun. 30, 2015
USD ($)
Dec. 31, 2015
Jan. 31, 2015
USD ($)
Concentration Risk [Line Items]                    
Number of states | state         46   46      
Number of Canadian provinces | province         7   7      
Impairment of real estate             $ 14,500 $ 28,700    
Rental income         $ 354,206 $ 322,478 $ 712,829 $ 648,095    
Atria                    
Concentration Risk [Line Items]                    
Ownership interests accounted for under the equity method (as a percent)         34.00%   34.00%   34.00%  
Number of board members appointed | board_member         2   2      
Number of board members | board_member         5   5      
LTACS                    
Concentration Risk [Line Items]                    
Lease modifications, number of properties | Lease 7                  
Original expected annual lease income         $ 8,000   $ 8,000      
Impairment of real estate             $ 10,300      
Rental income     $ 3,500              
Kindred                    
Concentration Risk [Line Items]                    
Lease modifications, number of properties | property       34            
Number of properties transitioned | property   9                
Lease modification and transition agreement amount                   $ 37,000
Seniors Housing Communities                    
Concentration Risk [Line Items]                    
Number of seniors housing communities under long-term management agreements | property         304   304      
Seniors Housing Communities | Atria and Sunrise                    
Concentration Risk [Line Items]                    
Number of seniors housing communities under long-term management agreements | property         268   268      
Total gross book value of properties | Atria                    
Concentration Risk [Line Items]                    
Concentration percentage             23.20%      
Total gross book value of properties | Sunrise                    
Concentration Risk [Line Items]                    
Concentration percentage             11.80%      
Total gross book value of properties | Brookdale Senior Living                    
Concentration Risk [Line Items]                    
Concentration percentage             8.50%      
Total gross book value of properties | Kindred                    
Concentration Risk [Line Items]                    
Concentration percentage             1.80%      
Total gross book value of properties | Ardent                    
Concentration Risk [Line Items]                    
Concentration percentage             5.30%      
Total gross book value of properties | Seniors Housing Communities                    
Concentration Risk [Line Items]                    
Concentration percentage             64.80%      
Total gross book value of properties | Hospitals, Medical Office Building, and Other                    
Concentration Risk [Line Items]                    
Concentration percentage             35.20%      
Total revenues                    
Concentration Risk [Line Items]                    
Number of states accounting for more than 10% of total revenues | state             1      
Total revenues | Brookdale Senior Living                    
Concentration Risk [Line Items]                    
Concentration percentage         4.90% 5.20%        
Total revenues | Kindred                    
Concentration Risk [Line Items]                    
Concentration percentage         5.40% 5.70%        
Total revenues | Ardent                    
Concentration Risk [Line Items]                    
Concentration percentage         3.10%          
Total NOI                    
Concentration Risk [Line Items]                    
Number of states accounting for more than 10% of net operating income | state         1   1      
Total NOI | Brookdale Senior Living                    
Concentration Risk [Line Items]                    
Concentration percentage         8.30% 9.10%        
Total NOI | Kindred                    
Concentration Risk [Line Items]                    
Concentration percentage         9.30% 10.00%        
Total NOI | Ardent                    
Concentration Risk [Line Items]                    
Concentration percentage         5.40%