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 12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Oct. 05, 2011
Jan. 05, 2011
Significant Accounting Policies [Abstract]                
Rental property in progress $ 30,948,000 $ 65,990,000   $ 30,948,000   $ 65,990,000    
Amortization of deferred financing costs 584,000   646,000 1,752,000 2,021,000      
Deferred leasing costs 1,099,000   872,000 3,135,000 2,728,000      
Minimum percentage of REIT taxable income distributed to shareholders       90.00%        
Preferred stock, shares outstanding 10,000 10,000   10,000   10,000 10,000 10,000
Common stock, shares outstanding 87,141,716 79,605,474   87,141,716   79,605,474 87,142,004 79,605,542
Common units outstanding 12,771,105 13,007,668   12,771,105   13,007,668 12,771,105 13,007,668
Preferred stock dividends per share           $ 50.00    
Preferred stock dividends per share declared $ 50.00              
Common unit distributions per share $ 0.45 $ 0.45            
Restricted stock expense $ 690,000   $ 626,000 $ 2,070,000 $ 1,869,000