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Real Estate (Real Estate Properties Sold) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
a
ft²
bldg
Dec. 31, 2017
USD ($)
a
ft²
bldg
Dec. 31, 2016
USD ($)
a
ft²
bldg
Dec. 31, 2015
a
bldg
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg 72      
Land and Land Improvements | Dallas [Member] | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres) 0      
Land and Land Improvements | Florida | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres) 30.8      
Not Discontinued Operations | 2018 sales | Building and Building Improvements | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg 39      
Leaseable square feet (in sqft) | ft² 3,418,564      
Not Discontinued Operations | 2018 sales | Building and Building Improvements | Carolinas/Richmond | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg 1      
Leaseable square feet (in sqft) | ft² 80,000      
Not Discontinued Operations | 2018 sales | Building and Building Improvements | Chicago/Minneapolis | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg 0      
Leaseable square feet (in sqft) | ft² 0      
Not Discontinued Operations | 2018 sales | Building and Building Improvements | Lehigh/Central PA | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg 0      
Leaseable square feet (in sqft) | ft² 0      
Not Discontinued Operations | 2018 sales | Building and Building Improvements | Philadelphia | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg 1      
Leaseable square feet (in sqft) | ft² 207,779      
Not Discontinued Operations | 2018 sales | Building and Building Improvements | United Kingdom | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg 0      
Leaseable square feet (in sqft) | ft² 0      
Not Discontinued Operations | 2018 sales | Building and Building Improvements | Other | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg 37      
Leaseable square feet (in sqft) | ft² 3,130,785      
Not Discontinued Operations | 2018 sales | Land and Land Improvements | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres) 79.1      
Not Discontinued Operations | 2018 sales | Land and Land Improvements | Carolinas/Richmond | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres) 1.5      
Not Discontinued Operations | 2018 sales | Land and Land Improvements | Chicago/Minneapolis | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres) 8.3      
Not Discontinued Operations | 2018 sales | Land and Land Improvements | Lehigh/Central PA | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres) 66.2      
Not Discontinued Operations | 2018 sales | Land and Land Improvements | Philadelphia | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres) 3.1      
Not Discontinued Operations | 2018 sales | Land and Land Improvements | United Kingdom | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres) 0      
Not Discontinued Operations | 2018 sales | Land and Land Improvements | Other | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres) 0      
Not Discontinued Operations | 2018 sales | Land, Buildings and Improvements | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $ $ 873,368      
Not Discontinued Operations | 2018 sales | Land, Buildings and Improvements | Carolinas/Richmond | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $ 7,094      
Not Discontinued Operations | 2018 sales | Land, Buildings and Improvements | Chicago/Minneapolis | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $ 2,714      
Not Discontinued Operations | 2018 sales | Land, Buildings and Improvements | Lehigh/Central PA | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $ 9,700      
Not Discontinued Operations | 2018 sales | Land, Buildings and Improvements | Philadelphia | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $ 130,818      
Not Discontinued Operations | 2018 sales | Land, Buildings and Improvements | United Kingdom | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $ 65,334      
Not Discontinued Operations | 2018 sales | Land, Buildings and Improvements | Other | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $ 657,708      
Not Discontinued Operations | 2017 sales | Building and Building Improvements | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg   10    
Leaseable square feet (in sqft) | ft²   2,340,204    
Not Discontinued Operations | 2017 sales | Building and Building Improvements | Chicago/Minneapolis | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg   3    
Leaseable square feet (in sqft) | ft²   136,110    
Not Discontinued Operations | 2017 sales | Building and Building Improvements | Florida | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg   0    
Leaseable square feet (in sqft) | ft²   0    
Not Discontinued Operations | 2017 sales | Building and Building Improvements | Houston | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg   1    
Leaseable square feet (in sqft) | ft²   206,808    
Not Discontinued Operations | 2017 sales | Building and Building Improvements | Lehigh/Central PA | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg   2    
Leaseable square feet (in sqft) | ft²   1,683,876    
Not Discontinued Operations | 2017 sales | Building and Building Improvements | Other | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg   4    
Leaseable square feet (in sqft) | ft²   313,410    
Not Discontinued Operations | 2017 sales | Land and Land Improvements | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)   113.1    
Not Discontinued Operations | 2017 sales | Land and Land Improvements | Chicago/Minneapolis | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)   0    
Not Discontinued Operations | 2017 sales | Land and Land Improvements | Florida | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)   16.4    
Not Discontinued Operations | 2017 sales | Land and Land Improvements | Houston | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)   42.2    
Not Discontinued Operations | 2017 sales | Land and Land Improvements | Lehigh/Central PA | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)   44.3    
Not Discontinued Operations | 2017 sales | Land and Land Improvements | Other | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)   10.2    
Not Discontinued Operations | 2017 sales | Land, Buildings and Improvements | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $   $ 367,258    
Not Discontinued Operations | 2017 sales | Land, Buildings and Improvements | Chicago/Minneapolis | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $   8,917    
Not Discontinued Operations | 2017 sales | Land, Buildings and Improvements | Florida | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $   13,256    
Not Discontinued Operations | 2017 sales | Land, Buildings and Improvements | Houston | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $   36,145    
Not Discontinued Operations | 2017 sales | Land, Buildings and Improvements | Lehigh/Central PA | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $   249,045    
Not Discontinued Operations | 2017 sales | Land, Buildings and Improvements | Other | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $   $ 59,895    
Not Discontinued Operations | 2016 sales | Building and Building Improvements | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg     125  
Leaseable square feet (in sqft) | ft²     9,463,990  
Not Discontinued Operations | 2016 sales | Building and Building Improvements | Chicago/Minneapolis | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg     24  
Leaseable square feet (in sqft) | ft²     2,037,275  
Not Discontinued Operations | 2016 sales | Building and Building Improvements | Dallas [Member] | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg     1  
Leaseable square feet (in sqft) | ft²     197,600  
Not Discontinued Operations | 2016 sales | Building and Building Improvements | Florida | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg     51  
Leaseable square feet (in sqft) | ft²     3,509,641  
Not Discontinued Operations | 2016 sales | Building and Building Improvements | Lehigh/Central PA | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg     1  
Leaseable square feet (in sqft) | ft²     120,777  
Not Discontinued Operations | 2016 sales | Building and Building Improvements | Philadelphia | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg     0  
Leaseable square feet (in sqft) | ft²     0  
Not Discontinued Operations | 2016 sales | Building and Building Improvements | Other | Operating Segments        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg     48  
Leaseable square feet (in sqft) | ft²     3,598,697  
Not Discontinued Operations | 2016 sales | Land and Land Improvements | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)     36.4  
Not Discontinued Operations | 2016 sales | Land and Land Improvements | Chicago/Minneapolis | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)     5.3  
Not Discontinued Operations | 2016 sales | Land and Land Improvements | Dallas [Member] | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)     0  
Not Discontinued Operations | 2016 sales | Land and Land Improvements | Florida | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)     12.1  
Not Discontinued Operations | 2016 sales | Land and Land Improvements | Lehigh/Central PA | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)     0  
Not Discontinued Operations | 2016 sales | Land and Land Improvements | Philadelphia | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)     1.0  
Not Discontinued Operations | 2016 sales | Land and Land Improvements | Other | Operating Segments        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)     18.0  
Not Discontinued Operations | 2016 sales | Land, Buildings and Improvements | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $     $ 1,210,555  
Not Discontinued Operations | 2016 sales | Land, Buildings and Improvements | Chicago/Minneapolis | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $     199,825  
Not Discontinued Operations | 2016 sales | Land, Buildings and Improvements | Dallas [Member] | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $     12,000  
Not Discontinued Operations | 2016 sales | Land, Buildings and Improvements | Florida | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $     505,828  
Not Discontinued Operations | 2016 sales | Land, Buildings and Improvements | Lehigh/Central PA | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $     11,200  
Not Discontinued Operations | 2016 sales | Land, Buildings and Improvements | Philadelphia | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $     2,640  
Not Discontinued Operations | 2016 sales | Land, Buildings and Improvements | Other | Operating Segments        
Disposition Disclosures [Line Items]        
Gross proceeds | $     479,062  
Not Discontinued Operations | 2015 sales | Building and Building Improvements | Southeastern PA        
Disposition Disclosures [Line Items]        
Number of buildings (in buildings) | bldg       41
Not Discontinued Operations | 2015 sales | Land and Land Improvements | Southeastern PA        
Disposition Disclosures [Line Items]        
Acres of developable land (in acres)       20
Not Discontinued Operations | 2015 sales | Land, Buildings and Improvements | Southeastern PA        
Disposition Disclosures [Line Items]        
Gain on sale of property | $     $ 14,300  
Recognized deferred gain | $ $ 14,300