Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Narrative) (Details)

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Significant Accounting Policies (Narrative) (Details) (USD $)
 0 Months Ended 3 Months Ended
Apr. 15, 2013
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Apr. 03, 2013
Jan. 04, 2013
Capitalized development and construction salaries and other related costs   $ 900,000   $ 1,000,000    
Rental property in-progress   123,500,000 107,600,000      
Maximum period after cessation of major construction activity that projects are considered complete   1 year        
Consolidated joint ventures, total real estate assets   195,900,000 198,300,000      
Consolidated joint ventures, mortgages   78,400,000 77,100,000      
Consolidated joint ventures, other liabilities   15,800,000 16,500,000      
Amortization of deferred financing costs   773,000   611,000    
Write off of unamortized deferred financing costs   0   0    
Deferred leasing costs   1,173,000   1,096,000    
Income taxes, material adjustment amount   0        
Common stock, shares outstanding   87,923,776 87,536,292   87,668,658 87,537,250
Common units outstanding   12,081,440 12,141,836   12,081,440 12,141,836
Common stock dividends and common unit distributions per share $ 0.45 $ 0.45 $ 0.45      
Common stock dividends and common unit distributions per share after reduction $ 0.30          
Common stock dividends and common unit annual distributions per share $ 1.20          
Restricted stock expense   845,000   814,000    
Difference between other comprehensive income and net income   0   0    
Accumulated other comprehensive income   $ 0   $ 0    
First Quarter 2013 [Member]
            
Distributions payable, record date   Apr. 03, 2013        
Common stock dividends and common unit distributions payable, date   Apr. 12, 2013        
Fourth Quarter 2012 [Member]
            
Distributions payable, record date   Jan. 04, 2013        
Common stock dividends and common unit distributions payable, date   Jan. 11, 2013