Annual report pursuant to Section 13 and 15(d)

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

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Real Estate Facilities (Activity In Real Estate Facilities) (Details)
ft² in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
ft²
Dec. 31, 2020
USD ($)
ft²
Dec. 31, 2019
USD ($)
Property, Plant and Equipment [Line Items]      
Beginning Balances $ 1,822,921 $ 1,816,366 $ 1,730,389
Accumulated Depreciation, Beginning Balances (1,101,739)    
Acquisition of real estate facilities 146,302 57,429 132,406
Capital expenditures 37,976 36,328 40,092
Depreciation and amortization expense (90,175) (90,058) (93,416)
Transfers from property held for development 9,052    
Transfer to properties held for sale 2,009 2,856 6,895
Accumulated Depreciation, Ending Balances (1,178,397) (1,101,739)  
Ending Balances 1,928,085 1,822,921 1,816,366
Properties held for sale, net $ 33,609 75,138  
Rentable area (in square feet) | ft² 27,712    
Land [Member]      
Property, Plant and Equipment [Line Items]      
Beginning Balances $ 843,765 813,504 725,411
Acquisition of real estate facilities 22,591 30,261 88,093
Capital expenditures
Disposals
Depreciation and amortization expense
Transfers from property held for development 989    
Transfer to properties held for sale
Ending Balances 867,345 843,765 813,504
Buildings And Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Beginning Balances 2,080,895 2,038,471 1,973,658
Acquisition of real estate facilities 123,711 27,168 44,313
Capital expenditures 37,976 36,328 40,092
Disposals (9,892) (19,399) (15,796)
Transfers from property held for development 8,063    
Transfer to properties held for sale (1,616) (1,673) (3,796)
Ending Balances 2,239,137 2,080,895 2,038,471
Accumulated Depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Accumulated Depreciation, Beginning Balances (1,101,739) (1,035,609) (968,680)
Accumulated Depreciation, Disposals 9,892 19,399 15,796
Depreciation and amortization expense (90,175) (90,058) (93,416)
Transfer to properties held for sale 3,625 4,529 10,691
Accumulated Depreciation, Ending Balances $ (1,178,397) (1,101,739) $ (1,035,609)
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]      
Properties held for sale, net   30,900  
Reclassification [Member] | Buildings And Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Properties held for sale, net   166,500  
Reclassification [Member] | Accumulated Depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Properties held for sale, net   $ 127,400  
Irving, TX [Member] | Industrial-Flex Business Park [Member]      
Property, Plant and Equipment [Line Items]      
Rentable area (in square feet) | ft²   772  
Irving, TX [Member] | Single-Tenant Industrial-Flex Building [Member]      
Property, Plant and Equipment [Line Items]      
Rentable area (in square feet) | ft²   22  
San Diego, CA [Member] | Industrial-Flex Business Park [Member]      
Property, Plant and Equipment [Line Items]      
Rentable area (in square feet) | ft²   371  
Herndon, VA [Member] | Office Business Park [Member]      
Property, Plant and Equipment [Line Items]      
Rentable area (in square feet) | ft²   244  
Chantilly, VA [Member] | Office Oriented Flex Business Park [Member]      
Property, Plant and Equipment [Line Items]      
Rentable area (in square feet) | ft²   198  
Beltsville, MD [Member] | Industrial Building [Member]      
Property, Plant and Equipment [Line Items]      
Rentable area (in square feet) | ft²   53