v3.26.1
Notes Payable (Summary Of Indebtedness) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Unsecured notes payable $ 4,529,573 $ 3,570,193
Weighted Average Interest Rate 4.10%  
Secured notes payable $ 318,755 330,597
Total notes payable (3) 4,848,300 3,900,800
Commercial Banks [Member]    
Unsecured notes payable $ 997,000 629,900
Commercial Banks [Member] | 4.83% Term Loan, due 2026    
Debt Instrument, Maturity Date Sep. 30, 2026  
Notes payable, effective interest rate 4.83%  
Unsecured notes payable $ 40,000 39,900
Commercial Banks [Member] | 4.30% Unsecured revolving credit facility    
Notes payable, effective interest rate 4.30%  
Unsecured notes payable $ 357,000 0
Commercial Banks [Member] | 3.83% Commercial Paper Program    
Unsecured notes payable $ 600,000 $ 590,000
Weighted Average Interest Rate 3.83% 3.84%
Senior Unsecured Notes [Member]    
Unsecured notes payable $ 3,532,600 $ 2,940,300
Senior Unsecured Notes [Member] | 4.97% Notes, due 2026    
Debt Instrument, Maturity Date Nov. 03, 2026  
Notes payable, effective interest rate 4.96%  
Unsecured notes payable $ 501,000 504,000
Senior Unsecured Notes [Member] | 3.74% Notes Due 2028    
Debt Instrument, Maturity Date Oct. 15, 2028  
Notes payable, effective interest rate 3.74%  
Unsecured notes payable $ 399,500 399,400
Senior Unsecured Notes [Member] | 3.67% Notes Due 2029    
Debt Instrument, Maturity Date Jul. 01, 2029  
Notes payable, effective interest rate 3.67%  
Unsecured notes payable $ 597,800 597,400
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 $ 747,100 746,800
Senior Unsecured Notes [Member] | 5.06% Notes Due 2034    
Debt Instrument, Maturity Date Jan. 15, 2034  
Notes payable, effective interest rate 5.06%  
Unsecured notes payable $ 395,900 395,700
Senior Unsecured Notes [Member] | 5.03% Notes, due 2036    
Debt Instrument, Maturity Date Feb. 28, 2036  
Notes payable, effective interest rate 5.03%  
Unsecured notes payable $ 594,200 0
Senior Unsecured Notes [Member] | 3.41% Notes Due 2049    
Debt Instrument, Maturity Date Nov. 01, 2049  
Notes payable, effective interest rate 3.41%  
Unsecured notes payable $ 297,100 297,000
Unsecured Debt    
Unsecured notes payable 4,529,600 3,570,200
Secured Debt    
Secured notes payable 318,700 330,600
Secured Debt | 3.78% - 4.04% Conventional Mortgage Notes, due 2026 - 2028    
Secured notes payable $ 279,600 291,500
Secured Debt | 3.87% note, due 2028    
Debt Instrument, Maturity Date Jan. 01, 2028  
Notes payable, effective interest rate 3.87%  
Secured notes payable $ 39,100 $ 39,100
Minimum [Member] | Secured Debt | 3.78% - 4.04% Conventional Mortgage Notes, due 2026 - 2028    
Debt Instrument, Maturity Date Oct. 01, 2026  
Notes payable, effective interest rate 3.78%  
Maximum [Member] | Secured Debt | 3.78% - 4.04% Conventional Mortgage Notes, due 2026 - 2028    
Debt Instrument, Maturity Date Apr. 01, 2028  
Notes payable, effective interest rate 4.01%