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Mortgage Notes Payable, Unsecured Notes and Credit Facility (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Notes Payable, Unsecured Notes and Credit Facility    
Total mortgage notes payable and unsecured notes and Term Loans $ 7,601,326,000 $ 7,629,814,000
Credit Facility 0 0
Total mortgage notes payable, unsecured notes, Term Loans and Credit Facility 7,601,326,000 7,629,814,000
Unsecured notes    
Notes Payable, Unsecured Notes and Credit Facility    
Long-term Debt, Percentage Bearing Fixed Interest, Amount 6,500,000,000 6,500,000,000
Total mortgage notes payable and unsecured notes and Term Loans 6,750,000,000  
Amount of debt discount 9,978,000 10,380,000
Amount of deferred financing costs, net 36,263,000 37,615,000
Term Loans    
Notes Payable, Unsecured Notes and Credit Facility    
Variable rate notes 250,000,000 250,000,000
Secured notes    
Notes Payable, Unsecured Notes and Credit Facility    
Long-term Debt, Percentage Bearing Fixed Interest, Amount 380,576,000 408,964,000
Variable rate notes 470,750,000 470,850,000
Total mortgage notes payable and unsecured notes and Term Loans 547,688,000  
Amount of debt discount 14,361,000 14,478,000
Amount of deferred financing costs, net 2,940,000 3,004,000
Line of Credit [Member]    
Notes Payable, Unsecured Notes and Credit Facility    
Credit Facility $ 0 $ 0