Mortgage Notes Payable, Unsecured Notes and Credit Facility (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Notes Payable, Unsecured Notes and Credit Facility
Total mortgage notes payable and unsecured notes and Term Loans	$ 7,844,286	$ 7,629,814
Credit Facility	0	0
Total mortgage notes payable, unsecured notes, Term Loans and Credit Facility	7,844,286	7,629,814
Unsecured notes
Notes Payable, Unsecured Notes and Credit Facility
Long-term Debt, Percentage Bearing Fixed Interest, Amount	6,750,000	6,500,000
Total mortgage notes payable and unsecured notes and Term Loans	7,000,000
Amount of debt discount	9,915	10,380
Amount of deferred financing costs, net	38,448	37,615
Term Loans
Notes Payable, Unsecured Notes and Credit Facility
Variable rate notes	250,000	250,000
Secured notes
Notes Payable, Unsecured Notes and Credit Facility
Long-term Debt, Percentage Bearing Fixed Interest, Amount	379,636	408,964
Variable rate notes	464,650	470,850
Total mortgage notes payable and unsecured notes and Term Loans	547,848
Amount of debt discount	13,806	14,478
Amount of deferred financing costs, net	$ 2,813	$ 3,004