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Customer Concentration (Tables)
 6 Months Ended
Jun. 30, 2011
Customer Concentration (Tables) [Abstract]  
Summary of customer concentration
                         
    Number of     Total     Percent of  
    Properties(2)     Investment(2)     Investment(3)  
Concentration by investment:(1)
                       
Genesis HealthCare Corporation
    148     $ 2,479,070       20 %
Benchmark Senior Living, LLC
    34       908,290       7 %
Merrill Gardens, LLC
    38       709,874       6 %
Senior Living Communities, LLC
    12       606,056       5 %
Brandywine Senior Living, LLC
    19       605,383       5 %
Remaining portfolio
    604       7,109,323       57 %
 
                 
Totals
    855     $ 12,417,996       100 %
 
                 
 
(1)   All of our top five customers are in our senior housing triple-net segment, except for Benchmark and Merrill Gardens, which are in our senior housing operating segment.
 
(2)   Excludes our share of unconsolidated joint venture investments. Please see Note 7 for additional information.
 
(3)   Investments with our top five customers comprised 32% of total investments at December 31, 2010.