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Notes Payable (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
yr
Dec. 31, 2020
USD ($)
Oct. 01, 2020
USD ($)
Mar. 31, 2020
USD ($)
Notes Payable [1] $ 3,167,600 $ 3,166,600    
Unamortized debt discounts and debt issuance costs 22,400 23,400    
Unsecured Debt 3,167,557 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 8.2      
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 3,127,800 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   $ 225,800
Weighted Average Interest Rate 1.90%     2.10%
1.85% Term loan, due 2022 [Member] | Commercial Banks [Member]        
Unsecured Debt $ 39,800 $ 39,700 $ 40,000  
Notes payable, effective interest rate 1.85% 2.70%    
Debt Instrument, Maturity Date Jan. 01, 2022      
[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] Includes all available extension options.
[3] Includes the effects of the applicable settled forward interest rate swaps.