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Investments in Unconsolidated Entities (Details Textuals) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Chartwell Partnership [Member]
Dec. 31, 2012
Chartwell Partnership [Member]
properties
Dec. 31, 2012
Chartwell Partnership [Member]
Controlling [Member]
properties
Dec. 31, 2012
Chartwell Partnership [Member]
Non Controlling [Member]
properties
Dec. 31, 2010
Forest City [Member]
properties
Dec. 31, 2013
Sunrise [Member]
Jul. 02, 2013
Sunrise [Member]
properties
Jan. 09, 2013
Sunrise [Member]
properties
Investments in Unconsolidated Joint Ventures Textuals [Line Items]                      
Percentage of partnership owned 20.00%       50.00%     49.00%     20.00%
Number of properties in portfolio         42 3 39 7   49 54
Unamortized investment       $ 9,063,000              
Equity investments 479,629,000 438,936,000             49,759,000    
Income from unconsolidated entities $ (8,187,000) $ 2,482,000 $ 5,772,000