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Concentration of Credit Risk (Details)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2015
property
state
province
Dec. 31, 2014
property
Dec. 31, 2015
property
state
province
Dec. 31, 2014
Dec. 31, 2013
Feb. 12, 2016
property
Jan. 31, 2015
USD ($)
Concentration of credit risk              
Number of states | state 46   46        
Number of Canadian provinces | province 7   7        
Ownership interests in properties accounted for under the equity method (as a percent) 5.00%   5.00%        
CCP              
Concentration of credit risk              
Number of properties transitioned 9            
Number of Contributed Properties in Spin-off 3   3        
Subsequent Event              
Concentration of credit risk              
Number of Contributed Properties in Spin-off           1  
Seniors Housing Communities              
Concentration of credit risk              
Number of seniors housing communities under long-term management agreements 268   268        
Number of independent third party managed properties 304   304        
Atria              
Concentration of credit risk              
Ownership interests in properties accounted for under the equity method (as a percent) 34.00%   34.00%        
Kindred              
Concentration of credit risk              
Number of properties transitioned 9 9          
Lease modifications, number of properties   34          
Lease modification and transition agreement amount | $             $ 37
Number of real estate properties sold 4            
Total gross book value of properties | Seniors Housing Communities              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)     65.20%        
Total gross book value of properties | Skilled nursing facilities, hospitals, MOBs and other healthcare assets              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)     34.80%        
Total gross book value of properties | Atria              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)     22.50%        
Total gross book value of properties | Sunrise              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)     11.70%        
Total gross book value of properties | Brookdale Senior Living              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)     8.50%        
Total gross book value of properties | Kindred              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)     2.10%        
Total gross book value of properties | Ardent              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)     5.30%        
Total revenues or NOI | California              
Concentration of credit risk              
Number of states accounting for more than 10% of total revenues | state     1        
Total revenues | Brookdale Senior Living              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)     5.30% 6.10% 6.20%    
Total revenues | Kindred              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)     5.60% 5.90% 6.20%    
Total revenues | Ardent              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)     1.30%        
Total NOI | Brookdale Senior Living              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)     9.30% 10.90% 11.20%    
Total NOI | Kindred              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)     9.80% 10.60% 11.20%    
Total NOI | Ardent              
Concentration of credit risk              
Percentage of real estate investments based on gross book value (as a percent)     2.30%