Quarterly report pursuant to Section 13 or 15(d)

Organization And Basis Of Presentation (Details)

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Organization And Basis Of Presentation (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
sqft
state
property
Dec. 31, 2013
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 279  
Aggregate square feet of the property owned or investment interest 31,500,000  
Number of states where properties are located 7  
Consolidated joint ventures, total real estate assets $ 227.0 $ 219.9
Consolidated joint ventures, mortgages 85.8 81.9
Consolidated joint ventures, other liabilities $ 15.1 $ 18.3
Commercial Properties [Member]
    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 266  
Number of tenants 2,000  
Multi-Family Properties [Member]
    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 13  
Number of units 3,898  
Office And Office/Flex Buildings [Member]
    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 251  
Aggregate square feet of the property owned or investment interest 30,900,000  
Unconsolidated Joint Venture Office Buildings [Member]
    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 30  
Aggregate square feet of the property owned or investment interest 5,100,000  
Industrial/Warehouse Facilities [Member]
    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 6  
Aggregate square feet of the property owned or investment interest 387,400  
Unconsolidated Joint Venture Multi-Family Properties [Member]
    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 7  
Number of units 2,597  
Parking/Retail [Member]
    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 5  
Aggregate square feet of the property owned or investment interest 121,500  
Unconsolidated Joint Venture Parking/Retail Buildings [Member]
    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 2  
Aggregate square feet of the property owned or investment interest 81,500  
Unconsolidated Joint Venture Hotel [Member]
    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 1  
Number of units 350  
Land [Member]
    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 3