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, 2014
Dec. 31, 2013
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Oct. 03, 2014
Jan. 06, 2014
Significant Accounting Policies [Line Items]              
Capitalized development and construction salaries and other related costs $ 1,000,000   $ 1,900,000 $ 2,700,000 $ 3,700,000    
Construction, tenant improvement, and development in-progress 58,800,000 40,800,000   58,800,000      
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 778,000   954,000 2,306,000 2,379,000    
Write off of unamortized deferred financing costs         156,000    
Deferred leasing costs 940,000   962,000 2,816,000 3,168,000    
Deferred tax asset 14,100,000     14,100,000      
Income taxes, material adjustment amount       0      
Common stock, shares outstanding 89,055,220 88,247,591   89,055,220   88,815,356 87,928,002
Common units outstanding 11,092,044 11,864,775   11,092,044   11,092,044 11,864,775
Distributions payable, record date Oct. 03, 2014 Jan. 06, 2014          
Common stock dividends and common unit distributions per share $ 0.15 $ 0.30          
Restricted stock expense 830,000   641,000 5,094,000 1,947,000    
Common stock dividends and common unit distributions payable, date Oct. 10, 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       $ 3,150,000