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Schedule IV - Mortgage Loans on Real Estate (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]      
Unscheduled principal reductions on mortgage notes $ 0.5 $ 1.9  
Controlling interest in consolidated joint venture    80.00%  
Aggregate total cost of mortgages for federal income tax purposes     162.2
Texas [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Mortgage note financing     $ 9.9
Iowa [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Controlling interest in consolidated joint venture   80.00%  
Number of medical office building purchased   1  
Number of land parcel 2