Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Narrative) (Details)

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Significant Accounting Policies (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Oct. 03, 2012
Jan. 05, 2012
Capitalized development and construction salaries and other related costs $ 765,000   $ 969,000 $ 2,738,000 $ 2,849,000    
Rental property in-progress 46,794,000 37,069,000   46,794,000      
Maximum period after cessation of major construction activity that projects are considered complete       1 year      
Amortization of deferred financing costs 673,000   584,000 1,945,000 1,752,000    
Write off of unamortized deferred financing costs 0   0 370,000 0    
Deferred leasing costs 1,156,000   1,099,000 3,312,000 3,135,000    
Minimum percentage of REIT taxable income distributed to shareholders       90.00%      
Common stock, shares outstanding 87,821,885 87,799,479   87,821,885   87,822,569 87,800,047
Common units outstanding 12,177,122 12,197,122   12,177,122   12,177,122 12,197,122
Common unit distributions per share $ 0.45 $ 0.45          
Restricted stock expense $ 579,000   $ 690,000 $ 1,971,000 $ 2,070,000    
Third Quarter 2012 [Member]
              
Distributions payable, record date       Oct. 03, 2012      
Common stock dividends and common unit distributions payable, date       Oct. 12, 2012      
Fourth Quarter 2011 [Member]
              
Distributions payable, record date       Jan. 05, 2012      
Common stock dividends and common unit distributions payable, date       Jan. 13, 2012