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Notes Payable (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
yr
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 19,600 $ 23,400  
Unsecured Debt 3,170,367 3,166,625  
Total notes payable [1] 3,170,400 3,166,600  
Loss on early retirement of debt 0 176 $ 11,995
Available amount under unsecured credit facility $ 885,200    
Weighted average interest rate on floating rate debt [2] 3.60%    
Weighted average maturity of indebtedness (including unsecured credit facility and unsecured short-term borrowings) (in years) | yr 7.4    
Letter Of Credit [Member]      
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility $ 50,000    
Outstanding balance under credit facility 14,800    
Commercial Banks [Member] | Unsecured Credit Facility [Member]      
Unsecured Debt 0    
Senior Unsecured Notes [Member]      
Unsecured Debt 3,130,500 3,126,900  
Unsecured Credit Facility [Member]      
Value not exceeding the amount available under the unsecured credit facility 450,000    
Line of Credit Facility, Maximum Borrowing Capacity $ 900,000    
Terms Of Bid Rate Loans 180 days    
Floating Rate Notes Payable [Member]      
Total notes payable $ 39,900 $ 39,700  
Weighted average interest rate on floating rate debt 1.90% 1.90%  
[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] Includes the effects of the applicable settled forward interest rate swaps.