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 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jul. 03, 2013
Jan. 04, 2013
Significant Accounting Policies [Line Items]              
Capitalized development and construction salaries and other related costs $ 900,000   $ 900,000 $ 1,700,000 $ 1,800,000    
Rental property in-progress 92,400,000 107,600,000   92,400,000      
Maximum period after cessation of major construction activity that projects are considered complete       1 year      
Consolidated joint ventures, total real estate assets 198,100,000 198,300,000   198,100,000      
Consolidated joint ventures, mortgages 78,900,000 77,100,000   78,900,000      
Consolidated joint ventures, other liabilities 15,700,000 16,500,000   15,700,000      
Amortization of deferred financing costs 809,000   661,000 1,582,000 1,272,000    
Write off of unamortized deferred financing costs 0   370,000 0 370,000    
Deferred leasing costs 1,033,000   1,060,000 2,206,000 2,156,000    
Income taxes, material adjustment amount       0      
Common stock, shares outstanding 88,004,354 87,536,292   88,004,354   87,748,884 87,537,250
Common units outstanding 12,003,241 12,141,836   12,003,241   12,003,241 12,141,836
Common stock dividends and common unit distributions per share   $ 0.45   $ 0.30      
Restricted stock expense 981,000   579,000 2,014,000 1,393,000    
Difference between other comprehensive income and net income 0   0 0 0    
Accumulated other comprehensive income $ 0   $ 0 $ 0 $ 0    
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      
Second Quarter 2013 [Member]
              
Significant Accounting Policies [Line Items]              
Distributions payable, record date       Jul. 03, 2013      
Common stock dividends and common unit distributions payable, date       Jul. 12, 2013