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

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Oct. 01, 2020

Total notes payable

^[1]

$ 3,170,400

$ 3,166,600

Unsecured Debt

3,170,367

3,166,625

Senior Unsecured Notes [Member]

Unsecured Debt

$ 3,130,500

$ 3,126,900

1.85% Term loan Due 2022 | Commercial Banks [Member]

Notes payable, effective interest rate

1.85%

1.85%

Unsecured Debt

$ 39,900

$ 39,700

$ 40,000

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

Notes payable, effective interest rate

3.15%

3.15%

Debt Instrument, Maturity Date

Dec. 15, 2022

Unsecured Debt

$ 349,300

$ 348,600

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

Notes payable, effective interest rate

5.07%

5.07%

Debt Instrument, Maturity Date

Jun. 15, 2023

Unsecured Debt

$ 249,300

$ 248,900

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

Notes payable, effective interest rate

4.36%

4.36%

Debt Instrument, Maturity Date

Jan. 15, 2024

Unsecured Debt

$ 249,500

$ 249,200

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

Notes payable, effective interest rate

3.68%

3.68%

Debt Instrument, Maturity Date

Sep. 15, 2024

Unsecured Debt

$ 248,800

$ 248,400

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

Notes payable, effective interest rate

3.74%

3.74%

Debt Instrument, Maturity Date

Oct. 15, 2028

Unsecured Debt

$ 397,800

$ 397,300

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

Notes payable, effective interest rate

3.67%

3.67%

Debt Instrument, Maturity Date

Jul. 01, 2029

Unsecured Debt

^[2]

$ 594,900

$ 594,300

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

Notes payable, effective interest rate

2.91%

2.91%

Debt Instrument, Maturity Date

May 15, 2030

Unsecured Debt

$ 744,100

$ 743,500

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

Notes payable, effective interest rate

3.41%

3.41%

Debt Instrument, Maturity Date

Nov. 01, 2049

Unsecured Debt

$ 296,800

$ 296,700

Unsecured Credit Facility [Member] | Commercial Banks [Member]

Unsecured Debt

$ 0

[1]	Unamortized debt discounts and debt issuance costs of $19.6 million and $23.4 million are included in senior unsecured notes payable as of December 31, 2021 and 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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