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Notes Payable (Narrative) (Details)
$ in Thousands
 1 Months Ended 6 Months Ended
May 31, 2018
Jun. 30, 2018
USD ($)
yr
May 12, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Unamortized debt discounts and debt issuance costs   $ 10,900   $ 12,300  
Unsecured Debt   1,339,659   1,338,628  
Available amount under unsecured credit facility   587,400      
Notes payable   $ 2,205,300   2,204,600  
Weighted Average Interest Rate [1]   4.40%      
Weighted average maturity of indebtedness (including unsecured line of credit) (in years) | yr   3.8      
Letter Of Credit [Member]          
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility   $ 50,000      
Outstanding balance under credit facility   12,600      
Short-term Debt [Member]          
Maximum borrowing capacity under unsecured credit facility     $ 45,000    
Debt Instrument, Basis Spread on Variable Rate 0.95%        
Other Short-term Borrowings   0      
Available amount under unsecured credit facility   $ 45,000      
Debt Instrument, Maturity Date   May 14, 2019      
Commercial Banks [Member] | Unsecured Credit Facility [Member]          
Unsecured Debt   $ 0      
Senior Unsecured Notes [Member]          
Unsecured Debt [2]   1,339,700   1,338,600  
Unsecured Credit Facility [Member]          
Unsecured Credit Facility, Current Borrowing Capacity   $ 600,000      
Unsecured Credit Facility, Expiration Date   Aug. 07, 2019      
Optional extension period of unsecured credit facility   August 2020      
Maximum borrowing capacity under unsecured credit facility   $ 900,000      
Maximum term of bid rate loans (days)   180      
Lesser of amount stated or the amount available under the unsecured credit facility   $ 300,000      
Floating rate notes payable [Member]          
Notes payable   $ 175,000   $ 175,000 $ 275,000
Weighted Average Interest Rate   2.60%     1.80%
[1] Includes all available extension options.
[2] Unamortized debt discounts and debt issuance costs of $10.9 million and $12.3 million are included in senior unsecured and secured notes payable as of June 30, 2018 and December 31, 2017, respectively.