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Dispositions, Assets Held for Sale and Discontinued Operations (Details Textual) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Year
Property
Sep. 30, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Impairment charge $ 947,000$ 202,000$ 947,000
Dispositions Assets Held For Sale And Discontinued Operations (Additional Textual) [Abstract]    
Numbers of properties sold  41 
Gain (loss) on sales of properties185,00010,526,00056,565,00020,559,000
Seniors housing triple-net [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Number of real property facilities satisfying held for sale criteria  2 
Impairment charge  $ 202,000 
Medical facilities [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Number of real property facilities satisfying held for sale criteria  1