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Commitments and Contingencies (Details 2)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Total Assets | California
     
Concentration of Credit Risk      
Concentration risk (as a percent) 23.00% 21.00%  
Total Assets | Operators | Emeritus Corporation
     
Concentration of Credit Risk      
Concentration risk (as a percent) 14.00% 14.00%  
Total Assets | Operators | Sunrise Senior Living
     
Concentration of Credit Risk      
Concentration risk (as a percent) 7.00% 7.00%  
Total Assets | Operators | HCR ManorCare
     
Concentration of Credit Risk      
Concentration risk (as a percent) 32.00% 31.00%  
Total Assets | Operators | Brookdale Senior Living
     
Concentration of Credit Risk      
Concentration risk (as a percent) 4.00% 4.00%  
Total Assets | Operators | Senior housing | Emeritus Corporation
     
Concentration of Credit Risk      
Concentration risk (as a percent) 37.00% 37.00%  
Total Assets | Operators | Senior housing | Sunrise Senior Living
     
Concentration of Credit Risk      
Concentration risk (as a percent) 17.00% 18.00%  
Total Assets | Operators | Senior housing | HCR ManorCare
     
Concentration of Credit Risk      
Concentration risk (as a percent) 11.00% 11.00%  
Total Assets | Operators | Senior housing | Brookdale Senior Living
     
Concentration of Credit Risk      
Concentration risk (as a percent) 11.00% 11.00%  
Total Assets | Operators | Post-acute/skilled | HCR ManorCare
     
Concentration of Credit Risk      
Concentration risk (as a percent) 89.00% 90.00%  
Revenue | California
     
Concentration of Credit Risk      
Concentration risk (as a percent) 21.00%    
Revenue | Texas
     
Concentration of Credit Risk      
Concentration risk (as a percent) 11.00%    
Revenue | Florida
     
Concentration of Credit Risk      
Concentration risk (as a percent) 9.00%    
Revenue | Operators | Emeritus Corporation
     
Concentration of Credit Risk      
Concentration risk (as a percent) 13.00% 8.00% 7.00%
Percentage of operator revenue to total entity revenue after inclusion of revenue under RIDEA structure 12.00%    
Revenue | Operators | Sunrise Senior Living
     
Concentration of Credit Risk      
Concentration risk (as a percent) 5.00% 5.00% 6.00%
Revenue | Operators | HCR ManorCare
     
Concentration of Credit Risk      
Concentration risk (as a percent) 28.00% 30.00% 28.00%
Revenue | Operators | Brookdale Senior Living
     
Concentration of Credit Risk      
Concentration risk (as a percent) 4.00% 5.00% 7.00%
Revenue | Operators | Senior housing | Emeritus Corporation
     
Concentration of Credit Risk      
Concentration risk (as a percent) 35.00% 23.00% 24.00%
Percentage of operator revenue to segment revenue after inclusion of revenue under RIDEA structure 37.00%    
Revenue | Operators | Senior housing | Sunrise Senior Living
     
Concentration of Credit Risk      
Concentration risk (as a percent) 13.00% 16.00% 19.00%
Revenue | Operators | Senior housing | HCR ManorCare
     
Concentration of Credit Risk      
Concentration risk (as a percent) 10.00% 11.00% 10.00%
Revenue | Operators | Senior housing | Brookdale Senior Living
     
Concentration of Credit Risk      
Concentration risk (as a percent) 12.00% 14.00% 22.00%
Revenue | Operators | Post-acute/skilled | HCR ManorCare
     
Concentration of Credit Risk      
Concentration risk (as a percent) 83.00% 91.00% 85.00%