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)
$ in Millions
 6 Months Ended
Jun. 30, 2015
USD ($)
ft²
state
property
item
Dec. 31, 2014
USD ($)
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 279  
Aggregate square feet of the property owned or investment interest | ft² 30,500,000  
Number of states where properties are located | state 7  
Consolidated joint ventures, total real estate assets | $ $ 247.3 $ 242.9
Consolidated joint ventures, mortgages | $ 96.9 94.3
Consolidated joint ventures, other liabilities | $ $ 16.6 $ 15.7
Commercial Properties [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 260  
Number of tenants | item 2,000  
Multi-Family Properties [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 19  
Number of units | item 5,644  
Office And Office/Flex Buildings [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 245  
Aggregate square feet of the property owned or investment interest | ft² 30,000,000  
Unconsolidated Joint Venture Office Buildings [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 36  
Aggregate square feet of the property owned or investment interest | ft² 5,600,000  
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 | ft² 387,400  
Unconsolidated Joint Venture Multi-Family Properties [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 13  
Number of units | item 4,343  
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 | ft² 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 | ft² 81,500  
Unconsolidated Joint Venture Hotel [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 1  
Number of units | item 350  
Land [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 3