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Investments In Real Estate (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
a
ft²
property
Jun. 30, 2017
USD ($)
a
ft²
property
Jun. 30, 2018
USD ($)
a
ft²
property
Jun. 30, 2017
USD ($)
a
ft²
property
Finite Lived Intangible Assets [Line Items]        
Number of properties | property 195   195  
Area of real estate property | ft² 12,500,000   12,500,000  
Debt, Weighted Average Interest Rate 3.80%   3.80%  
Recorded revenues $ 37,238 $ 32,778 $ 74,345 $ 64,219
2018 Acquisition [Member]        
Finite Lived Intangible Assets [Line Items]        
Total expected investment, including redevelopment costs     96,300  
Total aggregate initial investment     103,700  
Land     74,400  
Building And Improvements     25,400  
Intangible assets     3,900  
Intangible liabilities     2,700  
Recorded revenues 800   1,100  
Recorded net income $ 300   400  
Redevelopment costs     $ 28,500  
2017 Acquisition [Member]        
Finite Lived Intangible Assets [Line Items]        
Total expected investment, including redevelopment costs       155,900
Total aggregate initial investment   140,800    
Land   102,700   112,300
Building And Improvements   31,200   36,700
Intangible assets   6,900   6,900
Intangible liabilities   17,300   17,300
Recorded revenues   1,100   1,300
Recorded net income   $ 500   $ 600
Industrial Building [Member] | 2018 Acquisition [Member]        
Finite Lived Intangible Assets [Line Items]        
Number of properties acquired | property 2   5  
Area of real estate property acquired | ft² 50,000   468,000  
Industrial Building [Member] | 2017 Acquisition [Member]        
Finite Lived Intangible Assets [Line Items]        
Number of properties acquired | property   11   13
Area of real estate property acquired | ft²   807,000   898,000
Industrial Property And Land [Member] | 2018 Acquisition [Member]        
Finite Lived Intangible Assets [Line Items]        
Total aggregate initial investment $ 15,800      
Land 10,800      
Building And Improvements 3,800      
Intangible assets 1,300      
Intangible liabilities $ 400      
Land Improvements [Member]        
Finite Lived Intangible Assets [Line Items]        
Number of properties | property 11   11  
Area of real estate property | a 51.4   51.4  
Improved Land Parcels [Member] | 2018 Acquisition [Member]        
Finite Lived Intangible Assets [Line Items]        
Number of properties acquired | property 1   1  
Area of real estate property acquired | a 3.5   3.5  
Improved Land Parcels [Member] | 2017 Acquisition [Member]        
Finite Lived Intangible Assets [Line Items]        
Number of properties acquired | property   2   2
Area of real estate property acquired | a   17.8   17.8
Redevelopment Property [Member]        
Finite Lived Intangible Assets [Line Items]        
Number of properties | property 4   4  
Area of real estate property | ft² 500,000   500,000  
Redevelopment Property [Member] | Industrial Distribution Building [Member]        
Finite Lived Intangible Assets [Line Items]        
Number of properties | property 4   4  
Area of real estate property | ft² 500,000   500,000  
Total expected investment, including redevelopment costs     $ 119,200  
Capitalized interest associated with redevelopment activities $ 600 $ 0 800 $ 0
Redevelopment costs     $ 32,900  
Redevelopment Property [Member] | Industrial Building [Member] | 2018 Acquisition [Member]        
Finite Lived Intangible Assets [Line Items]        
Number of properties acquired | property     2  
Area of real estate property acquired | ft²     318,000