Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions (Dispositions) (Narrative) (Details)

v3.2.0.727
Recent Transactions (Dispositions) (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 26, 2015
USD ($)
ft²
Jun. 01, 2015
USD ($)
item
Jan. 15, 2015
USD ($)
ft²
Sep. 30, 2013
USD ($)
Jun. 30, 2015
USD ($)
ft²
property
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
ft²
Jun. 30, 2014
USD ($)
Dec. 31, 2014
property
Apr. 01, 2015
item
Real Estate Properties [Line Items]                    
Sales proceeds $ 80,000           $ 80,581 $ 190,798    
Mortgage loan         $ 1,719,141   1,719,141      
Realized gains on dispositions, net         $ 34,399 $ 54,584 $ 34,543 $ 54,584    
Number of properties sold | property                 16  
City Square Project [Member]                    
Real Estate Properties [Line Items]                    
Number of units | item                   365
1451 Metropolitan Drive [Member]                    
Real Estate Properties [Line Items]                    
Sales proceeds     $ 1,100              
Realized gains on dispositions, net     $ 100              
Area of property sold (in square feet) | ft²     21,600              
14 Sylvan Way [Member]                    
Real Estate Properties [Line Items]                    
Realized gains on dispositions, net $ 24,700                  
Area of property sold (in square feet) | ft² 203,506                  
4 Sylvan Way [Member]                    
Real Estate Properties [Line Items]                    
Area of property (in square feet) | ft²         105,135   105,135      
Mortgage loan         $ 14,600   $ 14,600      
Mortgage loan, maturity date         Aug. 11, 2014          
10 Independence [Member]                    
Real Estate Properties [Line Items]                    
Area of property (in square feet) | ft²         120,528   120,528      
Mortgage loan         $ 16,900   $ 16,900      
Mortgage loan, maturity date         Aug. 11, 2014          
4 Sylvan Way And 10 Independence [Member]                    
Real Estate Properties [Line Items]                    
Impairment charge on property       $ 12,200            
Realized gains on dispositions, net         $ 9,700          
Number of properties transferred | property         2          
Rosewood Lafayette Holdings, L.L.C. [Member]                    
Real Estate Properties [Line Items]                    
Percentage of interest in venture   25.00%                
Number of units | item   217                
Realized gains on dispositions, net   $ 6,400