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Notes Payable (Summary Of Indebtedness) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Unsecured notes payable $ 3,671,309 $ 3,170,367
Total unsecured notes payable (2) [1] $ 3,671,300 3,170,400
Commercial Banks [Member] | 1.85% Term loan, due 2022 [Member]    
Debt Instrument, Maturity Date Jan. 01, 2022  
Notes payable, effective interest rate 1.99%  
Unsecured notes payable $ 39,900 39,900
Commercial Banks [Member] | Unsecured Floating Rate Debt [Member]    
Notes payable, effective interest rate 0.00%  
Senior Unsecured Notes [Member]    
Unsecured notes payable $ 3,131,400 3,130,500
Senior Unsecured Notes [Member] | 3.15% Notes Due 2022 [Member]    
Debt Instrument, Maturity Date Dec. 15, 2022  
Notes payable, effective interest rate 3.15%  
Unsecured notes payable $ 349,500 349,300
Senior Unsecured Notes [Member] | 5.07% Notes Due 2023 [Member]    
Debt Instrument, Maturity Date Jun. 15, 2023  
Notes payable, effective interest rate 5.07%  
Unsecured notes payable $ 249,500 249,300
Senior Unsecured Notes [Member] | 4.36% Notes Due 2024 [Member]    
Debt Instrument, Maturity Date Jan. 15, 2024  
Notes payable, effective interest rate 4.36%  
Unsecured notes payable $ 249,500 249,500
Senior Unsecured Notes [Member] | 3.68% Notes Due 2024 [Member]    
Debt Instrument, Maturity Date Sep. 15, 2024  
Notes payable, effective interest rate 3.68%  
Unsecured notes payable $ 248,900 248,800
Senior Unsecured Notes [Member] | 3.74% Notes Due 2028 [Member]    
Debt Instrument, Maturity Date Oct. 15, 2028  
Notes payable, effective interest rate 3.74%  
Unsecured notes payable $ 397,900 397,800
Senior Unsecured Notes [Member] | 3.67% Notes Due 2029 [Member]    
Debt Instrument, Maturity Date Jul. 01, 2029  
Notes payable, effective interest rate 3.67%  
Unsecured notes payable [2] $ 595,000 594,900
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 $ 744,300 744,100
Senior Unsecured Notes [Member] | 3.41% Notes Due 2049 [Member]    
Debt Instrument, Maturity Date Nov. 01, 2049  
Notes payable, effective interest rate 3.41%  
Unsecured notes payable $ 296,800 296,800
1.23% Unsecured credit facility [Member] | Commercial Banks [Member]    
Notes payable, effective interest rate 1.23%  
Unsecured notes payable $ 500,000 0
Short-term Debt [Member] | Commercial Banks [Member]    
Unsecured notes payable $ 539,900 $ 39,900
[1] Unamortized debt discounts and debt issuance costs of $18.7 million and $19.6 million are included in senior unsecured notes payable as of March 31, 2022 and December 31, 2021, 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%.