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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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