Quarterly report pursuant to Section 13 or 15(d)

Real Estate Facilities (Activity In Real Estate Facilities) (Details)

v3.21.2
Real Estate Facilities (Activity In Real Estate Facilities) (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
USD ($)
ft²
Sep. 17, 2021
ft²
Jul. 16, 2021
ft²
Jun. 17, 2021
ft²
Dec. 31, 2020
USD ($)
ft²
Property, Plant and Equipment [Line Items]          
Beginning Balances $ 1,822,921        
Accumulated Depreciation, Beginning Balances (1,101,739)        
Acquisition of real estate facility 121,201        
Capital expenditures 26,121        
Depreciation and amortization expense (67,182)        
Transfers from property held for development 9,052        
Transfer to properties held for sale 2,097        
Accumulated Depreciation, Ending Balances (1,157,947)        
Ending Balances 1,914,210        
Properties held for sale, net $ 46,811       $ 75,138
Rentable area (in square feet) | ft² 28,100,000        
Land [Member]          
Property, Plant and Equipment [Line Items]          
Beginning Balances $ 843,765        
Acquisition of real estate facility 20,308        
Transfer to properties held for sale 989        
Ending Balances 865,062        
Buildings And Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Beginning Balances 2,080,895        
Acquisition of real estate facility 100,893        
Capital expenditures 26,121        
Disposals (7,349)        
Transfers from property held for development 8,063        
Transfer to properties held for sale (1,528)        
Ending Balances 2,207,095        
Accumulated Depreciation [Member]          
Property, Plant and Equipment [Line Items]          
Accumulated Depreciation, Beginning Balances (1,101,739)        
Accumulated Depreciation, Disposals 7,349        
Depreciation and amortization expense (67,182)        
Transfer to properties held for sale 3,625        
Accumulated Depreciation, Ending Balances (1,157,947)        
Reclassification [Member]          
Property, Plant and Equipment [Line Items]          
Properties held for sale, net         $ 75,100
Reclassification [Member] | Land [Member]          
Property, Plant and Equipment [Line Items]          
Beginning Balances (30,900)        
Reclassification [Member] | Buildings And Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Beginning Balances (166,500)        
Reclassification [Member] | Accumulated Depreciation [Member]          
Property, Plant and Equipment [Line Items]          
Beginning Balances $ (127,400)        
Irving, TX [Member]          
Property, Plant and Equipment [Line Items]          
Rentable area (in square feet) | ft²   22,000      
Irving, TX [Member] | Industrial-Flex Business Park [Member]          
Property, Plant and Equipment [Line Items]          
Rentable area (in square feet) | ft²         772,000
Irving, TX [Member] | Single-Tenant Industrial-Flex Building [Member]          
Property, Plant and Equipment [Line Items]          
Rentable area (in square feet) | ft²         22,000
San Diego, CA [Member] | Industrial-Flex Business Park [Member]          
Property, Plant and Equipment [Line Items]          
Rentable area (in square feet) | ft²         371,000
Herndon, VA [Member]          
Property, Plant and Equipment [Line Items]          
Rentable area (in square feet) | ft²     244,000    
Herndon, VA [Member] | Office Business Park [Member]          
Property, Plant and Equipment [Line Items]          
Rentable area (in square feet) | ft²         244,000
Chantilly, VA [Member]          
Property, Plant and Equipment [Line Items]          
Rentable area (in square feet) | ft²       198,000  
Chantilly, VA [Member] | Office Oriented Flex Business Park [Member]          
Property, Plant and Equipment [Line Items]          
Rentable area (in square feet) | ft²         198,000
Beltsville, MD [Member] | Industrial Building [Member]          
Property, Plant and Equipment [Line Items]          
Rentable area (in square feet) | ft²         53,000