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

9 Months Ended

Sep. 30, 2021

Dec. 31, 2020

Unsecured notes payable

$ 3,169,428

$ 3,166,625

Total unsecured notes payable (2)

^[1]

$ 3,169,400

$ 3,166,600

Commercial Banks [Member] | 1.85% Term loan, due 2022 [Member]

Debt Instrument, Maturity Date

Jan. 01, 2022

Notes payable, effective interest rate

1.85%

1.85%

Unsecured notes payable

$ 39,900

$ 39,700

Commercial Banks [Member] | Unsecured Floating Rate Debt [Member]

Notes payable, effective interest rate

0.00%

Senior Unsecured Notes [Member]

Unsecured notes payable

$ 3,129,500

$ 3,126,900

Senior Unsecured Notes [Member] | 3.15% Notes Due 2022 [Member]

Debt Instrument, Maturity Date

Dec. 15, 2022

Notes payable, effective interest rate

3.15%

3.15%

Unsecured notes payable

$ 349,100

$ 348,600

Senior Unsecured Notes [Member] | 5.07% Notes Due 2023 [Member]

Debt Instrument, Maturity Date

Jun. 15, 2023

Notes payable, effective interest rate

5.07%

5.07%

Unsecured notes payable

$ 249,200

$ 248,900

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

Debt Instrument, Maturity Date

Jan. 15, 2024

Notes payable, effective interest rate

4.36%

4.36%

Unsecured notes payable

$ 249,400

$ 249,200

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

Debt Instrument, Maturity Date

Sep. 15, 2024

Notes payable, effective interest rate

3.68%

3.68%

Unsecured notes payable

$ 248,700

$ 248,400

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

Debt Instrument, Maturity Date

Oct. 15, 2028

Notes payable, effective interest rate

3.74%

3.74%

Unsecured notes payable

$ 397,700

$ 397,300

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

Debt Instrument, Maturity Date

Jul. 01, 2029

Notes payable, effective interest rate

3.67%

3.67%

Unsecured notes payable

^[2]

$ 594,700

$ 594,300

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

Debt Instrument, Maturity Date

May 15, 2030

Notes payable, effective interest rate

2.91%

0.00%

Unsecured notes payable

$ 744,000

$ 743,500

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

Debt Instrument, Maturity Date

Nov. 01, 2049

Notes payable, effective interest rate

3.41%

3.41%

Unsecured notes payable

$ 296,700

$ 296,700

[1]	Unamortized debt discounts and debt issuance costs of $20.6 million and $23.4 million are included in senior unsecured notes payable as of September 30, 2021 and December 31, 2020, respectively.
[2]	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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