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CONCENTRATION OF CREDIT RISK (Details)
 6 Months Ended 3 Months Ended
Jun. 30, 2012
state
province
Jun. 30, 2012
Seniors housing communities
property
Jun. 30, 2012
Total gross book value of properties
Seniors housing communities
Jun. 30, 2012
Total gross book value of properties
Skilled nursing facilities, hospitals, MOBs and other healthcare assets
Jun. 30, 2012
Total gross book value of properties
ATRIA
Jun. 30, 2012
Total gross book value of properties
SUNRISE
Jun. 30, 2012
Total gross book value of properties
Brookdale Senior Living
Jun. 30, 2012
Total gross book value of properties
KINDRED
Jun. 30, 2012
Total revenues
Brookdale Senior Living
Jun. 30, 2011
Total revenues
Brookdale Senior Living
Jun. 30, 2012
Total revenues
KINDRED
Jun. 30, 2011
Total revenues
KINDRED
Jun. 30, 2012
Total NOI
Minimum
California
state
Concentration of credit risk                          
Percentage of real estate investments based on gross book value     64.00% 36.00% 18.20% 15.60% 11.50% 4.70%          
Number of states accounting for more than 10% of total revenues                         1
Percentage of total revenues derived by third party                 6.70% 8.00% 10.50% 17.40%  
Percentage of net operating income derived from lease agreements                 11.00% 13.90% 17.20% 29.90%  
Real estate properties                          
Number of Real Estate Properties under Long Term Management Agreements   214                      
Number of states 46                        
Number of Canadian provinces 2                        
Revenue concentration risk percentage 10.00%