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, 2014
Dec. 31, 2013
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jul. 03, 2014
Jan. 06, 2014
Significant Accounting Policies [Line Items]              
Capitalized development and construction salaries and other related costs $ 900,000   $ 900,000 $ 1,800,000 $ 1,700,000    
Construction, tenant improvement, and development in-progress 44,200,000 40,800,000   44,200,000      
Maximum period after cessation of major construction activity that projects are considered complete       1 year      
Threshold of investment value for discontinuation of equity method accounting 0     0      
Amortization of deferred financing costs 759,000   809,000 1,528,000 1,582,000    
Deferred leasing costs 845,000   1,033,000 1,876,000 2,206,000    
Deferred tax asset 14,100,000     14,100,000      
Income taxes, material adjustment amount       0      
Common stock, shares outstanding 88,982,062 88,247,591   88,982,062   88,730,563 87,928,002
Common units outstanding 11,164,018 11,864,775   11,164,018   11,161,018 11,864,775
Distributions payable, record date Jul. 03, 2014 Jan. 06, 2014          
Common stock dividends and common unit distributions per share $ 0.15 $ 0.30          
Restricted stock expense 877,000   461,000 4,264,000 1,306,000    
Common stock dividends and common unit distributions payable, date Jul. 11, 2014 Jan. 15, 2014          
Difference between other comprehensive income and net income 0   0 0 0    
Accumulated other comprehensive income 0 0   0      
Executive Officer [Member]
              
Significant Accounting Policies [Line Items]              
Restricted stock expense       $ 3,203,000