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Building Acquisitions and Dispositions (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
ft²
a
bldg
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
ft²
a
bldg
Sep. 30, 2016
USD ($)
Property, Plant and Equipment [Line Items]        
Gross Proceeds     $ 56,474 $ 142,808
Gain on property dispositions $ 23,840 $ 1,318 $ 30,542 $ 25,671
2015 sales [Member]        
Property, Plant and Equipment [Line Items]        
Gain on property dispositions $ 14,300      
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 6   6  
Leaseable square feet | ft² 260,018   260,018  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 53   53  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds     $ 48,901  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Chicago Minneapolis [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 3   3  
Leaseable square feet | ft² 136,110   136,110  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Chicago Minneapolis [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Chicago Minneapolis [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds     $ 8,917  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Florida [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Florida [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 16   16  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Florida [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds     $ 13,256  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Houston [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Houston [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 26   26  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Houston [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds     $ 4,270  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Philadelphia [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Philadelphia [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 2   2  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Philadelphia [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds     $ 6,904  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Southeastern PA [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 3   3  
Leaseable square feet | ft² 123,908   123,908  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Southeastern PA [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 3   3  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Southeastern PA [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds     $ 11,815  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Other Segments [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Other Segments [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 6   6  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales [Member] | Operating Segments [Member] | Other Segments [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds     $ 3,739  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 3   3  
Leaseable square feet | ft² 133,489   133,489  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 24   24  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds $ 21,477      
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Chicago Minneapolis [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 2   2  
Leaseable square feet | ft² 104,994   104,994  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Chicago Minneapolis [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Chicago Minneapolis [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds $ 5,817      
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Florida [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Florida [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 5   5  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Florida [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds $ 10,620      
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Houston [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Houston [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 19   19  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Houston [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds $ 2,275      
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Philadelphia [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Philadelphia [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Philadelphia [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds $ 0      
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Southeastern PA [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 1   1  
Leaseable square feet | ft² 28,495   28,495  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Southeastern PA [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Southeastern PA [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds $ 2,765      
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Other Segments [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Other Segments [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
Disposal Group, Not Discontinued Operations [Member] | 2017 sales current quarter [Member] | Operating Segments [Member] | Other Segments [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Gross Proceeds $ 0      
2017 acquisitions current quarter [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 3   3  
Leaseable square feet | ft² 354,391   354,391  
2017 acquisitions current quarter [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
2017 acquisitions current quarter [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price $ 42,249      
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Carolinas Richmond [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Carolinas Richmond [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Carolinas Richmond [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price $ 0      
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Lehigh Central PA [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Lehigh Central PA [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Lehigh Central PA [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price $ 0      
2017 acquisitions current quarter [Member] | Operating Segments [Member] | United Kingdom [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | United Kingdom [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | United Kingdom [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price $ 0      
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Arizona [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Arizona [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Arizona [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price $ 0      
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Atlanta [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Atlanta [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Atlanta [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price $ 0      
2017 acquisitions current quarter [Member] | Operating Segments [Member] | DC Metro [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | DC Metro [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | DC Metro [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price $ 0      
2017 acquisitions current quarter [Member] | Operating Segments [Member] | New Jersey [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 2   2  
Leaseable square feet | ft² 205,116   205,116  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | New Jersey [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | New Jersey [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price $ 25,599      
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Southern California [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 1   1  
Leaseable square feet | ft² 149,275   149,275  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Southern California [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
2017 acquisitions current quarter [Member] | Operating Segments [Member] | Southern California [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price $ 16,650      
2017 acquisitions [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 4   4  
Leaseable square feet | ft² 454,971   454,971  
2017 acquisitions [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 254   254  
2017 acquisitions [Member] | Southern California [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price     $ 101,349  
2017 acquisitions [Member] | Operating Segments [Member] | Carolinas Richmond [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
2017 acquisitions [Member] | Operating Segments [Member] | Carolinas Richmond [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 11   11  
2017 acquisitions [Member] | Operating Segments [Member] | Carolinas Richmond [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price     $ 1,242  
2017 acquisitions [Member] | Operating Segments [Member] | Lehigh Central PA [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
2017 acquisitions [Member] | Operating Segments [Member] | Lehigh Central PA [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 95   95  
2017 acquisitions [Member] | Operating Segments [Member] | Lehigh Central PA [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price     $ 17,798  
2017 acquisitions [Member] | Operating Segments [Member] | United Kingdom [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
2017 acquisitions [Member] | Operating Segments [Member] | United Kingdom [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 35   35  
2017 acquisitions [Member] | Operating Segments [Member] | United Kingdom [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price     $ 12,550  
2017 acquisitions [Member] | Operating Segments [Member] | Arizona [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
2017 acquisitions [Member] | Operating Segments [Member] | Arizona [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 6   6  
2017 acquisitions [Member] | Operating Segments [Member] | Arizona [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price     $ 1,327  
2017 acquisitions [Member] | Operating Segments [Member] | Atlanta [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
2017 acquisitions [Member] | Operating Segments [Member] | Atlanta [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 80   80  
2017 acquisitions [Member] | Operating Segments [Member] | Atlanta [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price     $ 2,867  
2017 acquisitions [Member] | Operating Segments [Member] | DC Metro [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 0   0  
Leaseable square feet | ft² 0   0  
2017 acquisitions [Member] | Operating Segments [Member] | DC Metro [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 10   10  
2017 acquisitions [Member] | Operating Segments [Member] | DC Metro [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price     $ 504  
2017 acquisitions [Member] | Operating Segments [Member] | New Jersey [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 2   2  
Leaseable square feet | ft² 205,116   205,116  
2017 acquisitions [Member] | Operating Segments [Member] | New Jersey [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 17   17  
2017 acquisitions [Member] | Operating Segments [Member] | New Jersey [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price     $ 29,301  
2017 acquisitions [Member] | Operating Segments [Member] | Southern California [Member] | Building and Building Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Number of Real Estate Properties | bldg 2   2  
Leaseable square feet | ft² 249,855   249,855  
2017 acquisitions [Member] | Operating Segments [Member] | Southern California [Member] | Land and Land Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Acres of developable land | a 0   0  
2017 acquisitions [Member] | Operating Segments [Member] | Southern California [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Purchase price     $ 35,760