Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Narrative) (Details)

v2.4.0.8
Significant Accounting Policies (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Apr. 03, 2014
Jan. 06, 2014
Significant Accounting Policies [Line Items]          
Capitalized development and construction salaries and other related costs $ 900,000   $ 900,000    
Construction, tenant improvement, and development in-progress 49,200,000 40,800,000      
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        
Amortization of deferred financing costs 769,000   773,000    
Deferred leasing costs 1,031,000   1,173,000    
Deferred tax asset 14,400,000        
Income taxes, material adjustment amount 0        
Common stock, shares outstanding 88,630,146 88,247,591   88,461,183 87,928,002
Common units outstanding 11,518,069 11,864,775   11,518,069 11,864,775
Distributions payable, record date Apr. 03, 2014 Jan. 06, 2014      
Common stock dividends and common unit distributions per share $ 0.30 $ 0.30      
Restricted stock expense 3,387,000   845,000    
Common stock dividends and common unit distributions payable, date Apr. 11, 2014 Jan. 15, 2014      
Difference between other comprehensive income and net income 0   0    
Accumulated other comprehensive income 0 0      
Executive Officer [Member]
          
Significant Accounting Policies [Line Items]          
Restricted stock expense $ 3,203,000