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 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Oct. 05, 2015
Jan. 06, 2015
Significant Accounting Policies [Line Items]                
Capitalized development and construction salaries and other related costs $ 900,000   $ 1,000,000 $ 3,500,000 $ 2,700,000      
Construction, tenant improvement, and development in-progress 103,100,000 $ 62,800,000   $ 103,100,000   $ 62,800,000    
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 945,000   778,000 2,846,000 2,306,000      
Write off of unamortized deferred financing costs       0 0      
Deferred leasing costs 922,000   $ 940,000 2,738,000 2,816,000      
Deferred tax asset $ 16,000,000     16,000,000        
Income taxes, material adjustment amount       $ 0        
Common stock, shares outstanding 89,310,243 89,076,578   89,310,243   89,076,578   88,866,652
Common units outstanding 10,790,142 11,083,876   10,790,142   11,083,876   11,083,876
Distributions payable, record date       Oct. 05, 2015   Jan. 06, 2015    
Distributions payable, approved date Sep. 22, 2015   Dec. 09, 2014          
Common stock dividends and common unit distributions per share $ 0.15 $ 0.15            
Restricted stock expense $ 695,000   $ 830,000 $ 1,500,000 5,094,000      
Distributions payable, pay date Oct. 15, 2015   Jan. 14, 2015          
Difference between other comprehensive income and net income $ 0   $ 0 0 0      
Accumulated other comprehensive income $ 0 $ 0   $ 0   $ 0    
Executive Officer [Member]                
Significant Accounting Policies [Line Items]                
Restricted stock expense         $ 3,150,000      
Subsequent Event [Member]                
Significant Accounting Policies [Line Items]                
Common stock, shares outstanding             89,310,308  
Common units outstanding             10,790,142