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Notes Payable (Narrative) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
yr
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Unamortized debt discounts and debt issuance costs $ 14,400   $ 15,700
Notes payable $ 2,450,300   2,480,600
Weighted Average Interest Rate 4.40%    
Weighted average maturity of indebtedness (including unsecured line of credit) (in years) | yr 4.6    
Repayments of Notes Payable $ 30,700    
Loss on early retirement of debt 323 $ 0  
Letter Of Credit [Member]      
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility 50,000    
Outstanding balance under credit facility 12,700    
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    
Available amount under unsecured credit facility 587,300    
Floating rate notes payable [Member]      
Notes payable $ 175,000 $ 492,100 $ 205,700
Weighted Average Interest Rate 1.40%