Annual report pursuant to Section 13 and 15(d)

Real Estate Transactions (Acquisitions) (Narrative) (Details)

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Real Estate Transactions (Acquisitions) (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
item
Dec. 31, 2012
Real Estate Properties [Line Items]    
Transaction costs $ 642,000  
Number of parking spaces 850  
Total purchase price 236,559,000  
Purchase accounting adjustments 0  
Goodwill 2,945,000 2,945,000
Capitalization rate 8.50% 9.00%
Earn out paid 2,755,000  
Multi-Family Properties [Member]
   
Real Estate Properties [Line Items]    
Number of units 3,678  
Roseland Partners, L.L.C. [Member]
   
Real Estate Properties [Line Items]    
Transaction costs   5,800,000
Total purchase price   115,602,000
Cash consideration   115,579,000
Contingent consideration at fair value 10,010,000  
Purchase accounting adjustments 0  
Business acquisition, contingent cash payment 15,600,000  
Goodwill   2,945,000
Contingent purchase price measurement period 33 months  
Discount on contingently returnable consideration 0  
Amount of cash deposited to escrow 34,000,000  
Roseland Partners, L.L.C. [Member] | Multi-Family Properties [Member]
   
Real Estate Properties [Line Items]    
Number of real estate properties   6
Number of units   1,769
Roseland Partners, L.L.C. [Member] | Condo-Residential Properties [Member]
   
Real Estate Properties [Line Items]    
Number of real estate properties   1
Number of units   3
Roseland Partners, L.L.C. [Member] | Commercial Properties [Member]
   
Real Estate Properties [Line Items]    
Number of real estate properties   4
Area of property (in square feet)   212,000
In-Process Development Projects [Member] | Roseland Partners, L.L.C. [Member]
   
Real Estate Properties [Line Items]    
Number of real estate properties   13
In-Process Development Projects [Member] | Roseland Partners, L.L.C. [Member] | Multi-Family Properties [Member]
   
Real Estate Properties [Line Items]    
Number of real estate properties   9
Number of units   2,149
In-Process Development Projects [Member] | Roseland Partners, L.L.C. [Member] | Garages [Member]
   
Real Estate Properties [Line Items]    
Number of real estate properties   2
Number of parking spaces   1,591
In-Process Development Projects [Member] | Roseland Partners, L.L.C. [Member] | Retail [Member]
   
Real Estate Properties [Line Items]    
Number of real estate properties   2
Area of property (in square feet)   35,400
Interests Or Options In Land Parcels [Member] | Roseland Partners, L.L.C. [Member] | Multi-Family Properties [Member]
   
Real Estate Properties [Line Items]    
Number of units   5,980
Area of property (in square feet)   736,000
Interests Or Options In Land Parcels [Member] | Roseland Partners, L.L.C. [Member] | Hotel [Member]
   
Real Estate Properties [Line Items]    
Number of units   321
Roseland Assets [Member] | Roseland Partners, L.L.C. [Member]
   
Real Estate Properties [Line Items]    
Contingent consideration at fair value 6,300,000  
Business acquisition, contingent cash payment 8,600,000  
Completion Of Certain Developments [Member] | Roseland Partners, L.L.C. [Member]
   
Real Estate Properties [Line Items]    
Business acquisition, contingent cash payment 2,800,000  
Start Of Construction On Certain Developments [Member] | Roseland Partners, L.L.C. [Member]
   
Real Estate Properties [Line Items]    
Business acquisition, contingent cash payment 2,800,000  
Obtaining Of Tax Credits/Grants [Member] | Roseland Partners, L.L.C. [Member]
   
Real Estate Properties [Line Items]    
Business acquisition, contingent cash payment 3,000,000  
Business acquisition, earn out period 3 years  
Probability of occurrence of contingent consideration payment events 50.00%  
Total Return To Shareholders [Member] | Roseland Partners, L.L.C. [Member]
   
Real Estate Properties [Line Items]    
Contingent consideration at fair value 3,700,000  
Business acquisition, contingent cash payment 7,000,000  
Business acquisition, earn out period 3 years  
Failure To Achieve Certain Level Of Fee Revenue [Member] | Roseland Partners, L.L.C. [Member]
   
Real Estate Properties [Line Items]    
Business acquisition, contingent cash payment $ 2,000,000  
Minimum [Member]
   
Real Estate Properties [Line Items]    
Discount rate 10.00% 10.00%
Minimum [Member] | Roseland Partners, L.L.C. [Member]
   
Real Estate Properties [Line Items]    
Discount rate 10.00%  
Capitalization rate 5.00%  
Minimum [Member] | Completion And Start Of Certain Developments [Member] | Roseland Partners, L.L.C. [Member]
   
Real Estate Properties [Line Items]    
Probability of occurrence of contingent consideration payment events 92.00%  
Maximum [Member]
   
Real Estate Properties [Line Items]    
Discount rate 15.00% 15.00%
Maximum [Member] | Roseland Partners, L.L.C. [Member]
   
Real Estate Properties [Line Items]    
Discount rate 15.00%  
Capitalization rate 7.50%  
Maximum [Member] | Completion And Start Of Certain Developments [Member] | Roseland Partners, L.L.C. [Member]
   
Real Estate Properties [Line Items]    
Probability of occurrence of contingent consideration payment events 99.00%