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Commitments and Contingencies (Details Textual)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Communities
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
Real Estate Properties [Line Items]        
Number of Real Estate Properties 133     2
Wholly-owned — redevelopment        
Real Estate Properties [Line Items]        
Development costs and capital expenditures Incurred but not yet paid $ 1.2      
Number of Real Estate Properties       3
Wholly-owned — under development        
Real Estate Properties [Line Items]        
Development costs and capital expenditures Incurred but not yet paid 12.6      
Number of Real Estate Properties       1
Office Space [Member]        
Real Estate Properties [Line Items]        
Rent expense $ 0.3 $ 1.3 $ 1.3  
Ground Leases [Member]        
Real Estate Properties [Line Items]        
Number of Real Estate Properties | Communities 6      
Rent expense $ 5.5 $ 5.4 $ 5.2