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Notes Payable (Summary Of Indebtedness) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Oct. 01, 2020
Unsecured notes payable $ 3,167,557 $ 3,166,625  
Total unsecured notes payable (2) [1] $ 3,167,600 $ 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% 2.70%  
Unsecured notes payable $ 39,800 $ 39,700 $ 40,000
Commercial Banks [Member] | Unsecured Floating Rate Debt [Member]      
Notes payable, effective interest rate 0.00%    
Senior Unsecured Notes [Member]      
Unsecured notes payable $ 3,127,800 $ 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 $ 348,800 $ 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 $ 249,000 $ 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 $ 249,300 $ 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 $ 248,500 $ 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 $ 397,400 $ 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] $ 594,400 $ 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 $ 743,700 $ 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 $22.4 million and $23.4 million are included in senior unsecured notes payable as of March 31, 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%.