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Customer Concentration (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2011
Dec. 31, 2010
Concentration by investment:  
Number of Properties885 
Total Investment$ 12,964,651 
Percent of Investment100.00% 
Customer Concentration (Textual) [Abstract]  
Percentage total investments with top five customers 32.00%
Genesis HealthCare Corporation [Member]
  
Concentration by investment:  
Number of Properties149 
Total Investment2,472,607 
Percent of Investment19.00% 
Benchmark Senior Living, LLC [Member]
  
Concentration by investment:  
Number of Properties35 
Total Investment897,925 
Percent of Investment7.00% 
Merrill Gardens, LLC [Member]
  
Concentration by investment:  
Number of Properties38 
Total Investment699,913 
Percent of Investment5.00% 
Brandywine Senior Living, LLC [Member]
  
Concentration by investment:  
Number of Properties19 
Total Investment602,476 
Percent of Investment5.00% 
Senior Living Communities, LLC [Member]
  
Concentration by investment:  
Number of Properties12 
Total Investment605,861 
Percent of Investment5.00% 
Remaining Portfolio [Member]
  
Concentration by investment:  
Number of Properties632 
Total Investment$ 7,685,869 
Percent of Investment59.00%