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Rental Property - Disposals (Details)
ft² in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
ft²
building
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
ft²
building
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of buildings disposed | building 501   501    
Area (in square feet) | ft² 100.1   100.1    
Carrying value of property sold $ 4,623,908,000   $ 4,623,908,000   $ 4,525,193,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of buildings disposed | building 6   6    
Area (in square feet) | ft² 0.9   0.9    
Carrying value of property sold $ 27,200,000   $ 27,200,000    
Contribution to revenue 200,000 $ 1,100,000 500,000 $ 2,100,000  
Disposal Group, Including Discontinued Operation, Operating Income (Loss) $ 100,000 $ 500,000 100,000 $ 800,000  
Net proceeds from sales of rental property     39,600,000    
Gain (Loss) on Sale     $ 12,400,000