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Debt (Tables)
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Summary of company's mortgage notes payable, unsecured notes, term loan and credit facility The following amounts and discussion do not include the mortgage notes related to the communities classified as held for sale, if any, as of December 31, 2022 and 2021, as shown in the Consolidated Balance Sheets (dollars in thousands) (see Note 6, “Real Estate Disposition Activities”). The weighted average interest rates in the following table for secured and unsecured notes include costs of financing such as credit enhancement fees, trustees' fees, the impact of interest rate hedges and mark-to-market adjustments.
 December 31, 2022December 31, 2021
Fixed rate unsecured notes$7,500,000 3.3 %$7,150,000 3.2 %
Term Loans150,000 5.4 %250,000 1.1 %
Fixed rate mortgage notes payable—conventional and tax-exempt270,677 3.4 %306,281 3.7 %
Variable rate mortgage notes payable—conventional and tax-exempt457,150 5.3 %464,150 1.7 %
Total mortgage notes payable and unsecured notes and Term Loans8,377,827 3.4 %8,170,431 3.1 %
Credit Facility— — %— — %
Commercial paper— — %— — %
Total principal outstanding8,377,827 3.4 %8,170,431 3.1 %
Less deferred financing costs and debt discount (1)(61,782)(66,884)
Total$8,316,045 $8,103,547 
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(1)     Excludes deferred financing costs and debt discount associated with the Credit Facility and the Commercial Paper Program which are included in prepaid expenses and other assets on the accompanying Consolidated Balance Sheets.
Schedule of borrowing capacity under the Credit Facility
The borrowing capacity under the Credit Facility is impacted by the Commercial Paper Program and the following letters of credit (dollars in thousands):

 December 31, 2022December 31, 2021
Letters of credit$1,914 $11,969 
Scheduled payments and maturities of mortgage notes payable and unsecured notes outstanding In addition to the Commercial Paper Program, scheduled payments and maturities of secured notes payable and unsecured notes outstanding at December 31, 2022 were as follows (dollars in thousands):
YearSecured notes
principal payments		Secured notes
maturities		Unsecured notes and
Term Loan maturities		Stated interest rate of
unsecured notes and Term Loan
2023$8,300 $— $350,000 4.200 %
250,000 2.850 %
20249,100 — 300,000 3.500 %
150,000 (1)
SOFR + 0.95%
20259,700 — 525,000 3.450 %
300,000 3.500 %
202610,600 — 475,000 2.950 %
300,000 2.900 %
202712,900 236,100 400,000 3.350 %
202817,600 — 450,000 3.200 %
400,000 1.900 %
20298,500 66,250 450,000 3.300 %
20309,000 — 700,000 2.300 %
20319,600 — 600,000 2.450 %
203210,300 — 700,000 2.050 %
Thereafter74,800 245,077 350,000 5.000 %
350,000 3.900 %
300,000 4.150 %
300,000 4.350 %
$180,400 $547,427 $7,650,000  
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(1)     In October 2022, the Company amended the Term Loan transitioning the benchmark rate from LIBOR to SOFR. The borrowing spread to SOFR of 0.95% per annum, consists of a 0.10% SOFR adjustment plus 0.85% per annum.