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Notes Payable (Narrative) (Details)
$ in Thousands
3 Months Ended
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
yr
Apr. 16, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Notes Payable   $ 2,606,900   $ 2,524,100  
Unamortized debt discounts and debt issuance costs   19,100   19,900  
Unsecured Debt   2,606,876   2,524,099  
Available amount under unsecured credit facility   $ 765,100      
Weighted Average Interest Rate [1],[2]   3.70%      
Weighted average maturity of indebtedness (including unsecured line of credit) (in years) | yr   8.5      
Letter Of Credit [Member]          
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility   $ 50,000      
Outstanding balance under credit facility   8,900      
Commercial Banks [Member] | Unsecured Credit Facility [Member]          
Unsecured Debt   126,000   44,000  
Senior Unsecured Notes [Member]          
Unsecured Debt [3]   2,381,100   2,380,400  
Unsecured Credit Facility [Member]          
Maximum borrowing capacity under unsecured credit facility   $ 900,000      
Maximum term of bid rate loans (days)   P180D      
Lesser of amount stated or the amount available under the unsecured credit facility   $ 450,000      
Floating rate notes payable [Member]          
Notes Payable   $ 225,800 [4]   $ 143,700 [4] $ 341,600
Weighted Average Interest Rate   2.10%     3.30%
Subsequent Event [Member] | Unsecured notes 2.80% due 2030 [Member] [Member] | Senior Unsecured Notes [Member]          
Debt Instrument, Interest Rate During Period 2.905%        
Proceeds from Issuance of Debt $ 743,100        
Debt Instrument, Face Amount     $ 750,000    
Debt Instrument, Interest Rate, Stated Percentage     2.80%    
Discounted notes payable face amount 99.929%        
[1]
Includes all available extension options.
[2] Includes the effects of the applicable settled forward interest rate swaps.
[3]
Unamortized debt discounts and debt issuance costs of $19.1 million and $19.9 million are included in senior unsecured and secured notes payable as of March 31, 2020 and December 31, 2019, respectively.
[4]
Includes balances outstanding under our unsecured credit facility at March 31, 2020 and December 31, 2019.