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Notes Payable (Narrative) (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
USD ($)
yr
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Notes Payable [1] $ 3,168,500 $ 3,166,600  
Unamortized debt discounts and debt issuance costs 21,500 23,400  
Unsecured Debt 3,168,492 3,166,625  
Available amount under unsecured credit facility $ 887,800    
Weighted Average Interest Rate [2],[3] 3.60%    
Weighted average maturity of indebtedness (including unsecured line of credit) (in years) | yr 7.9    
Letter Of Credit [Member]      
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility $ 50,000    
Outstanding balance under credit facility 12,200    
Senior Unsecured Notes [Member]      
Unsecured Debt 3,128,700 3,126,900  
Unsecured Credit Facility [Member]      
Maximum borrowing capacity under unsecured credit facility $ 900,000    
Maximum term of bid rate loans (days) 180 days    
Lesser of amount stated or the amount available under the unsecured credit facility $ 450,000    
Floating rate notes payable [Member]      
Notes Payable $ 39,800 39,700 $ 99,800
Weighted Average Interest Rate 1.90%   1.20%
1.85% Term loan, due 2022 [Member] | Commercial Banks [Member]      
Unsecured Debt $ 39,800 $ 39,700  
Notes payable, effective interest rate 1.85% 1.85%  
Debt Instrument, Maturity Date Jan. 01, 2022    
[1] Unamortized debt discounts and debt issuance costs of $21.5 million and $23.4 million are included in senior unsecured notes payable as of June 30, 2021 and December 31, 2020, respectively.
[2] Includes all available extension options.
[3] Includes the effects of the applicable settled forward interest rate swaps.