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 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2015
Apr. 05, 2016
Jan. 06, 2016
Significant Accounting Policies [Line Items]            
Capitalized development and construction salaries and other related costs $ 600,000   $ 1,300,000      
Construction, tenant improvement, and development in-progress $ 144,900,000 $ 88,700,000   $ 88,700,000    
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 1,169,000   953,000      
Write off of unamortized deferred financing costs 0   0      
Deferred leasing costs 780,000   970,000      
Deferred tax asset 23,400,000          
Income taxes, material adjustment amount $ 0          
Common stock, shares outstanding 89,638,312 89,583,950   89,583,950   89,584,008
Common units outstanding 10,499,844 10,516,844   10,516,844   10,516,844
LTIP units outstanding 657,373          
Distributions payable, record date Apr. 05, 2016     Jan. 06, 2016    
Distributions payable, approved date Mar. 08, 2016 Dec. 08, 2015        
Common stock dividends and common unit distributions per share $ 0.15 $ 0.15        
Restricted stock expense $ 785,000   $ 313,000      
Distributions payable, pay date Apr. 15, 2016 Jan. 15, 2016        
Subsequent Event [Member]            
Significant Accounting Policies [Line Items]            
Common stock, shares outstanding         89,638,337  
Common units outstanding         10,499,844  
LTIP units outstanding         657,373