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Real Estate (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
a
ft²
bldg
Jun. 30, 2019
USD ($)
a
ft²
bldg
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
a
ft²
bldg
Jun. 30, 2018
USD ($)
Property, Plant and Equipment [Line Items]          
Loss on debt extinguishment       $ (7,618) $ 0
Net proceeds from disposition of properties/land       210,970 313,055
Repayments of Secured Debt       49,915 30,377
Acquisition of noncontrolling interest   $ 17,757   18,513  
Discontinued operations          
Property, Plant and Equipment [Line Items]          
Loss on debt extinguishment   $ (7,618) $ 0 $ (7,618) $ 0
2019 acquisitions [Member] | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 6 6   6  
Leaseable Square Feet (in sqft) | ft² 1,287,670 1,287,670   1,287,670  
2019 acquisitions [Member] | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 179.7 179.7   179.7  
2019 acquisitions [Member] | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Purchase Price (in thousands)       $ 161,618  
2019 acquisitions [Member] | Dallas | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 2 2   2  
Leaseable Square Feet (in sqft) | ft² 509,733 509,733   509,733  
2019 acquisitions [Member] | Dallas | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 acquisitions [Member] | Dallas | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Purchase Price (in thousands)       $ 44,400  
2019 acquisitions [Member] | Southern California | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 1 1   1  
Leaseable Square Feet (in sqft) | ft² 289,683 289,683   289,683  
2019 acquisitions [Member] | Southern California | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 acquisitions [Member] | Southern California | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Purchase Price (in thousands)       $ 31,285  
2019 acquisitions [Member] | United Kingdom | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 acquisitions [Member] | United Kingdom | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 25.0 25.0   25.0  
2019 acquisitions [Member] | United Kingdom | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Purchase Price (in thousands)       $ 2,658  
2019 acquisitions [Member] | Atlanta | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 acquisitions [Member] | Atlanta | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 154.7 154.7   154.7  
2019 acquisitions [Member] | Atlanta | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Payments to Acquire Real Estate       $ 5,000  
2019 acquisitions [Member] | New Jersey | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 3 3   3  
Leaseable Square Feet (in sqft) | ft² 488,254 488,254   488,254  
2019 acquisitions [Member] | New Jersey | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 acquisitions [Member] | New Jersey | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Purchase Price (in thousands)       $ 78,275  
2019 acquisitions current quarter [Member] | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 1 1   1  
Leaseable Square Feet (in sqft) | ft² 218,000 218,000   218,000  
2019 acquisitions current quarter [Member] | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 acquisitions current quarter [Member] | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Purchase Price (in thousands)   $ 26,500      
2019 acquisitions current quarter [Member] | Dallas | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 acquisitions current quarter [Member] | Dallas | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 acquisitions current quarter [Member] | Dallas | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Purchase Price (in thousands)   $ 0      
2019 acquisitions current quarter [Member] | Southern California | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 acquisitions current quarter [Member] | Southern California | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 acquisitions current quarter [Member] | Southern California | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Purchase Price (in thousands)   $ 0      
2019 acquisitions current quarter [Member] | United Kingdom | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 acquisitions current quarter [Member] | United Kingdom | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 acquisitions current quarter [Member] | United Kingdom | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Purchase Price (in thousands)   $ 0      
2019 acquisitions current quarter [Member] | Atlanta | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 acquisitions current quarter [Member] | Atlanta | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 acquisitions current quarter [Member] | Atlanta | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Purchase Price (in thousands)   $ 0      
2019 acquisitions current quarter [Member] | New Jersey | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 1 1   1  
Leaseable Square Feet (in sqft) | ft² 218,000 218,000   218,000  
2019 acquisitions current quarter [Member] | New Jersey | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 acquisitions current quarter [Member] | New Jersey | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Purchase Price (in thousands)   $ 26,500      
2019 acquisitions of noncontrolling interest current quarter | Philadelphia          
Property, Plant and Equipment [Line Items]          
Number of Consolidated Joint Ventures 2 2   2  
2019 acquisitions of noncontrolling interest current quarter | Philadelphia | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 4 4   4  
2019 acquisitions of noncontrolling interest current quarter | Philadelphia | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Purchase Price (in thousands)   $ 17,800      
2019 acquisitions of noncontrolling interest          
Property, Plant and Equipment [Line Items]          
Number of Consolidated Joint Ventures 3 3   3  
2019 acquisitions of noncontrolling interest | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Purchase Price (in thousands)       $ 18,500  
2019 acquisitions of noncontrolling interest | Dallas | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 1 1   1  
2019 acquisitions of noncontrolling interest | Philadelphia | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 4 4   4  
2019 acquisitions of noncontrolling interest | Southern California | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 1 1   1  
2019 acquisitions of noncontrolling interest | Arizona | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 21.7 21.7   21.7  
2019 acquisitions of noncontrolling interest | New Jersey | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 1 1   1  
2019 sales current quarter | Philadelphia          
Property, Plant and Equipment [Line Items]          
Repayments of Secured Debt $ (35,900)        
2019 sales current quarter | Philadelphia | Land Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Gain (Loss) on Sale of Interest in Projects   $ 2,000      
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 4 4   4  
Leaseable Square Feet (in sqft) | ft² 227,422 227,422   227,422  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 42.1 42.1   42.1  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)   $ 125,320      
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Chicago/Minneapolis | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Chicago/Minneapolis | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 11.3 11.3   11.3  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Chicago/Minneapolis | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)   $ 2,865      
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Florida | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Florida | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Florida | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)   $ 0      
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Houston | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Houston | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 4.0 4.0   4.0  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Houston | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Net proceeds from disposition of properties/land       $ 1,505  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Philadelphia | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 1 1   1  
Leaseable Square Feet (in sqft) | ft² 153,242 153,242   153,242  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Philadelphia | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Philadelphia | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)   $ 99,250      
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Arizona | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 8.8 8.8   8.8  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | Southeastern PA | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 18.0 18.0   18.0  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | New Jersey | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | New Jersey | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | New Jersey | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)   $ 0      
2019 sales current quarter | Disposal Group, Not Discontinued Operations | DC Metro | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | DC Metro | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 sales current quarter | Disposal Group, Not Discontinued Operations | DC Metro | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)   $ 0      
2019 sales current quarter | Discontinued operations | Philadelphia          
Property, Plant and Equipment [Line Items]          
Debt Instrument, Interest Rate During Period 4.84%        
Loss on debt extinguishment $ 7,600        
2019 sales current quarter | Discontinued operations | Arizona | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 sales current quarter | Discontinued operations | Arizona | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)   $ 11,500      
2019 sales current quarter | Discontinued operations | Southeastern PA | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 3 3   3  
Leaseable Square Feet (in sqft) | ft² 74,180 74,180   74,180  
2019 sales current quarter | Discontinued operations | Southeastern PA | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)   $ 10,200      
2019 sales | Philadelphia | Land Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Gain (Loss) on Sale of Interest in Projects       $ 2,000  
2019 sales | Disposal Group, Not Discontinued Operations | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 8 8   8  
Leaseable Square Feet (in sqft) | ft² 524,645 524,645   524,645  
2019 sales | Disposal Group, Not Discontinued Operations | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 42.9 42.9   42.9  
2019 sales | Disposal Group, Not Discontinued Operations | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)       $ 214,470  
2019 sales | Disposal Group, Not Discontinued Operations | Chicago/Minneapolis | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 sales | Disposal Group, Not Discontinued Operations | Chicago/Minneapolis | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 11.3 11.3   11.3  
2019 sales | Disposal Group, Not Discontinued Operations | Chicago/Minneapolis | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)       $ 2,865  
2019 sales | Disposal Group, Not Discontinued Operations | Florida | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 3 3   3  
Leaseable Square Feet (in sqft) | ft² 150,751 150,751   150,751  
2019 sales | Disposal Group, Not Discontinued Operations | Florida | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 sales | Disposal Group, Not Discontinued Operations | Florida | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Net proceeds from disposition of properties/land       $ 23,400  
2019 sales | Disposal Group, Not Discontinued Operations | Houston | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 sales | Disposal Group, Not Discontinued Operations | Houston | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 4.0 4.0   4.0  
2019 sales | Disposal Group, Not Discontinued Operations | Houston | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Net proceeds from disposition of properties/land       $ 1,505  
2019 sales | Disposal Group, Not Discontinued Operations | Philadelphia | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 1 1   1  
Leaseable Square Feet (in sqft) | ft² 153,242 153,242   153,242  
2019 sales | Disposal Group, Not Discontinued Operations | Philadelphia | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 sales | Disposal Group, Not Discontinued Operations | Philadelphia | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)       $ 99,250  
2019 sales | Disposal Group, Not Discontinued Operations | Arizona | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 8.8 8.8   8.8  
2019 sales | Disposal Group, Not Discontinued Operations | Southeastern PA | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 18.0 18.0   18.0  
2019 sales | Disposal Group, Not Discontinued Operations | New Jersey | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0.8 0.8   0.8  
2019 sales | Disposal Group, Not Discontinued Operations | DC Metro | Acres of Developable Land          
Property, Plant and Equipment [Line Items]          
Acres of Developable Land (in acres) | a 0 0   0  
2019 sales | Discontinued operations | Arizona | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 sales | Discontinued operations | Arizona | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)       $ 11,500  
2019 sales | Discontinued operations | Southeastern PA | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 3 3   3  
Leaseable Square Feet (in sqft) | ft² 74,180 74,180   74,180  
2019 sales | Discontinued operations | Southeastern PA | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)       $ 10,200  
2019 sales | Discontinued operations | New Jersey | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 0 0   0  
Leaseable Square Feet (in sqft) | ft² 0 0   0  
2019 sales | Discontinued operations | New Jersey | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)       $ 4,000  
2019 sales | Discontinued operations | DC Metro | Building and Building Improvements          
Property, Plant and Equipment [Line Items]          
Number of buildings (in buildings) | bldg 1 1   1  
Leaseable Square Feet (in sqft) | ft² 146,472 146,472   146,472  
2019 sales | Discontinued operations | DC Metro | Land, Buildings and Improvements          
Property, Plant and Equipment [Line Items]          
Gross Proceeds (in thousands)       $ 61,750