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Notes Payable (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
yr
Jun. 30, 2020
USD ($)
yr
Apr. 16, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Notes Payable $ 3,224,900 $ 3,224,900   $ 2,524,100  
Unamortized debt discounts and debt issuance costs 25,100 25,100   19,900  
Unsecured Debt 3,224,871 3,224,871   2,524,099  
Available amount under unsecured credit facility $ 889,800 $ 889,800      
Weighted Average Interest Rate [1],[2] 3.50% 3.50%      
Weighted average maturity of indebtedness (including unsecured line of credit) (in years) | yr 8.8 8.8      
Letter Of Credit [Member]          
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility $ 50,000 $ 50,000      
Outstanding balance under credit facility 10,200 10,200      
Commercial Banks [Member] | Unsecured Credit Facility [Member]          
Unsecured Debt 0 0   44,000  
Senior Unsecured Notes [Member]          
Unsecured Debt [3] 3,125,100 3,125,100   2,380,400  
Unsecured Credit Facility [Member]          
Maximum borrowing capacity under unsecured credit facility 900,000 $ 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 $ 99,800 [4] $ 99,800 [4]   $ 143,700 [4] $ 99,600
Weighted Average Interest Rate 1.20% 1.20%     3.40%
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 $25.1 million and $19.9 million are included in senior unsecured and secured notes payable as of June 30, 2020 and December 31, 2019, respectively.
[4]
Includes balances outstanding under our unsecured credit facility at December 31, 2019.