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, 2013
Dec. 31, 2012
Sep. 30, 2012
Sep. 30, 2013
property
Sep. 30, 2012
Oct. 03, 2013
Jan. 04, 2013
Significant Accounting Policies [Line Items]              
Capitalized development and construction salaries and other related costs $ 1,900,000   $ 800,000 $ 3,700,000 $ 2,200,000    
Rental property in-progress 44,900,000 107,600,000   44,900,000      
Number of properties placed into service       2      
Maximum period after cessation of major construction activity that projects are considered complete       1 year      
Consolidated joint ventures, total real estate assets 210,600,000 198,300,000   210,600,000      
Consolidated joint ventures, mortgages 79,400,000 77,100,000   79,400,000      
Consolidated joint ventures, other liabilities 16,600,000 16,500,000   16,600,000      
Amortization of deferred financing costs 954,000   673,000 2,379,000 1,945,000    
Write off of unamortized deferred financing costs 156,000   0 156,000 370,000    
Deferred leasing costs 962,000   1,156,000 3,168,000 3,312,000    
Income taxes, material adjustment amount       0      
Common stock, shares outstanding 88,021,807 87,536,292   88,021,807   87,766,758 87,537,250
Common units outstanding 11,987,175 12,141,836   11,987,175   11,987,175 12,141,836
Common stock dividends and common unit distributions per share $ 0.30 $ 0.45          
Restricted stock expense 755,000   579,000 2,402,000 1,971,000    
Difference between other comprehensive income and net income 0   0 0 0    
Accumulated other comprehensive income $ 0   $ 0 $ 0 $ 0    
Third Quarter 2013 [Member]
              
Significant Accounting Policies [Line Items]              
Distributions payable, record date       Oct. 03, 2013      
Common stock dividends and common unit distributions payable, date       Oct. 11, 2013      
Fourth Quarter 2012 [Member]
              
Significant Accounting Policies [Line Items]              
Distributions payable, record date       Jan. 04, 2013      
Common stock dividends and common unit distributions payable, date       Jan. 11, 2013