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CONCENTRATION OF CREDIT RISK (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Apr. 03, 2016
Lease
Apr. 29, 2016
USD ($)
Dec. 31, 2014
property
Mar. 31, 2016
USD ($)
board_member
property
state
province
Mar. 31, 2015
USD ($)
Dec. 31, 2015
Jan. 31, 2015
USD ($)
Concentration Risk [Line Items]              
Number of states | state       46      
Number of Canadian provinces | province       7      
Impairment of real estate       $ 10,300 $ 19,200    
Rental income       $ 358,623 $ 325,617    
Atria              
Concentration Risk [Line Items]              
Ownership interests accounted for under the equity method (as a percent)       34.00%   34.00%  
Number of board members appointed | board_member       2      
Number of board members | board_member       5      
LTACS              
Concentration Risk [Line Items]              
Original expected annual lease income       $ 8,000      
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      
Seniors Housing Communities | Atria and Sunrise              
Concentration Risk [Line Items]              
Number of seniors housing communities under long-term management agreements | property       268      
Total gross book value of properties | Atria              
Concentration Risk [Line Items]              
Concentration percentage       22.60%      
Total gross book value of properties | Sunrise              
Concentration Risk [Line Items]              
Concentration percentage       11.70%      
Total gross book value of properties | Brookdale Senior Living              
Concentration Risk [Line Items]              
Concentration percentage       8.40%      
Total gross book value of properties | Kindred              
Concentration Risk [Line Items]              
Concentration percentage       2.10%      
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       65.00%      
Total gross book value of properties | Hospitals, Medical Office Building, and Other              
Concentration Risk [Line Items]              
Concentration percentage       35.00%      
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       4.80% 6.10%    
Total revenues | Kindred              
Concentration Risk [Line Items]              
Concentration percentage       5.30% 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      
Total NOI | Brookdale Senior Living              
Concentration Risk [Line Items]              
Concentration percentage       8.30% 10.70%    
Total NOI | Kindred              
Concentration Risk [Line Items]              
Concentration percentage       9.20% 10.10%    
Total NOI | Ardent              
Concentration Risk [Line Items]              
Concentration percentage       5.30%      
Subsequent Event | LTACS              
Concentration Risk [Line Items]              
Lease modifications, number of properties | Lease 7            
Rental income   $ 3,500