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Notes Payable (Narrative) (Details)
$ in Thousands
6 Months Ended
Jun. 06, 2019
USD ($)
Jun. 30, 2019
USD ($)
yr
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Notes Payable   $ 2,476,800 $ 2,321,600  
Unamortized debt discounts and debt issuance costs   18,800 13,900  
Unsecured Debt   2,431,336 1,836,427  
Available amount under unsecured credit facility   $ 889,900    
Weighted Average Interest Rate [1]   4.00%    
Weighted average maturity of indebtedness (including unsecured line of credit) (in years) | yr   6.5    
Notes payable, effective interest rate 3.179%      
Derivative, Notional Amount $ 300,000      
Debt Instrument, Interest Rate During Period   3.67%    
Proceeds from Issuance of Debt 593,400      
Debt Instrument, Face Amount $ 600,000      
Debt Instrument, Interest Rate, Stated Percentage 3.15%      
Discounted notes payable face amount 99.751%      
Debt Instrument, Interest Rate Before June 2026   3.84%    
Debt Instrument, Interest Rate After June 2026   3.28%    
Letter Of Credit [Member]        
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility   $ 50,000    
Outstanding balance under credit facility   10,100    
Senior Unsecured Notes [Member]        
Unsecured Debt [2]   2,331,700 1,736,800  
Unsecured Credit Facility [Member]        
Unsecured Credit Facility, Current Borrowing Capacity   600,000    
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   $ 99,600 $ 99,600 $ 175,000
Weighted Average Interest Rate   3.40%   2.60%
Secured Notes Fixed Rate Debt due 2019 [Member] | Secured Debt [Member]        
Repayments of Secured Debt   $ 439,300    
[1] Includes the effects of the applicable settled forward interest rate swaps.
[2]
Unamortized debt discounts and debt issuance costs of $18.8 million and $13.9 million are included in senior unsecured and secured notes payable as of June 30, 2019 and December 31, 2018, respectively.