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Notes Payable (Summary Of Indebtedness) (Details) - USD ($)
$ in Thousands

6 Months Ended

Jun. 30, 2024

Jan. 04, 2024

Dec. 31, 2023

Unsecured notes payable

$ 3,222,569

$ 3,385,309

Secured notes payable

330,241

330,127

Total notes payable (3)

^[1]

3,552,800

3,715,400

Commercial Banks [Member]

Unsecured notes payable

$ 40,000

339,900

Commercial Banks [Member] | 6.55% Term Loan, due 2024

Debt Instrument, Maturity Date

Sep. 30, 2024

Notes payable, effective interest rate

6.55%

Unsecured notes payable

$ 40,000

39,900

Commercial Banks [Member] | 6.21% Term Loan, due 2024

Debt Instrument, Maturity Date

Aug. 30, 2024

Notes payable, effective interest rate

6.21%

6.21%

Unsecured notes payable

$ 0

300,000

Commercial Banks [Member] | 6.13% Unsecured revolving credit facility

Notes payable, effective interest rate

6.13%

Senior Unsecured Notes [Member]

Unsecured notes payable

$ 3,182,600

3,045,400

Senior Unsecured Notes [Member] | 4.36% Notes Due 2024

Debt Instrument, Maturity Date

Jan. 15, 2024

Notes payable, effective interest rate

4.36%

4.36%

Unsecured notes payable

$ 0

250,000

Senior Unsecured Notes [Member] | 3.68% Notes Due 2024

Debt Instrument, Maturity Date

Sep. 15, 2024

Notes payable, effective interest rate

3.68%

Unsecured notes payable

$ 249,900

249,700

Senior Unsecured Notes [Member] | 6.76% Notes Due 2026

Debt Instrument, Maturity Date

Nov. 03, 2026

Notes payable, effective interest rate

6.69%

Unsecured notes payable

^[2]

$ 499,700

508,600

Senior Unsecured Notes [Member] | 3.74% Notes Due 2028

Debt Instrument, Maturity Date

Oct. 15, 2028

Notes payable, effective interest rate

3.74%

Unsecured notes payable

$ 398,900

398,700

Senior Unsecured Notes [Member] | 3.67% Notes Due 2029

Debt Instrument, Maturity Date

Jul. 01, 2029

Notes payable, effective interest rate

3.67%

Unsecured notes payable

^[3]

$ 596,500

596,100

Senior Unsecured Notes [Member] | 2.91% Notes, due 2030

Debt Instrument, Maturity Date

May 15, 2030

Notes payable, effective interest rate

2.91%

Unsecured notes payable

$ 745,700

745,400

Senior Unsecured Notes [Member] | 5.06% Notes Due 2034

Debt Instrument, Maturity Date

Jan. 15, 2034

Notes payable, effective interest rate

5.06%

Unsecured notes payable

$ 395,000

0

Senior Unsecured Notes [Member] | 3.41% Notes Due 2049

Debt Instrument, Maturity Date

Nov. 01, 2049

Notes payable, effective interest rate

3.41%

Unsecured notes payable

$ 296,900

296,900

Unsecured Debt

Unsecured notes payable

3,222,600

3,385,300

Secured Debt

Secured notes payable

330,200

330,100

Secured Debt | 3.78% - 4.04% Conventional Mortgage Notes, due 2026 - 2028

Secured notes payable

$ 291,300

291,300

Secured Debt | 3.87% note, due 2028

Debt Instrument, Maturity Date

Jan. 01, 2028

Notes payable, effective interest rate

3.87%

Secured notes payable

$ 38,900

$ 38,800

Minimum [Member] | Secured Debt | 3.78% - 4.04% Conventional Mortgage Notes, due 2026 - 2028

Debt Instrument, Maturity Date

Oct. 01, 2026

Notes payable, effective interest rate

3.78%

Maximum [Member] | Secured Debt | 3.78% - 4.04% Conventional Mortgage Notes, due 2026 - 2028

Debt Instrument, Maturity Date

Apr. 01, 2028

Notes payable, effective interest rate

4.04%

[1]	Balances are decreased by unamortized debt discounts, debt issuance costs, and fair market value adjustments, net of $18.1 million and $5.5 million as of June 30, 2024 and December 31, 2023, respectively.
[2]	Balances are increased by $2.2 million and $11.6 million for fair value adjustments due to changes in benchmark interest rates related to these notes as of June 30, 2024 and December 31, 2023, respectively. See Note 7, "Derivative Financial Instruments and Hedging Activities," for further discussion.
[3]	The 2029 Notes have an effective annual interest rate of approximately 3.84% through June 2026, which includes the effect of a settled forward interest rate swap, and approximately 3.28% thereafter, for an all-in average effective rate of approximately 3.67%.

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