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Customer Concentration
 12 Months Ended
Dec. 31, 2010
Customer Concentration [Abstract]  
Customer Concentration
8. Customer Concentration
     The following table summarizes certain information about our customer concentration as of December 31, 2010 (dollars in thousands):
                         
    Number of     Total     Percent of  
    Properties     Investment(2)     Investment(3)  
Concentration by investment:(1)
                       
Merrill Gardens LLC
    38     $ 732,211       9 %
Brandywine Senior Living, LLC
    19       612,598       7 %
Senior Living Communities, LLC
    12       595,223       7 %
Senior Star Living
    10       464,062       5 %
Brookdale Senior Living, Inc.
    86       334,946       4 %
Remaining portfolio
    518       5,853,069       68 %
 
                 
Totals
    683     $ 8,592,109       100 %
 
                 
 
(1)   All of our top five customers are in our senior housing triple-net segment, except Merrill Gardens and Senior Star 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 24% of total investments at December 31, 2009.