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Notes Payable (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Oct. 31, 2016
Sep. 30, 2016
Nov. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt instrument                
Total principal amount           $ 3,975,000 $ 3,650,000  
Unamortized original issuance discounts and deferred financing costs           (41,000) (32,000)  
Notes payable, net           3,934,433 3,617,973  
Principal payments on notes payable           275,000 150,000  
Proceeds from issuance of debt             $ 250,000  
Maturity of notes and bonds payable                
2017           175,000    
2018           350,000    
2019           550,000    
2021           250,000    
Thereafter           2,650,000    
Totals           $ 3,975,000    
Minimum                
Debt instrument                
Interest rate (as a percent)           2.40% 2.00%  
Effective yield (as a percent)           2.50% 2.20%  
Maximum                
Debt instrument                
Interest rate (as a percent)           6.90% 6.90%  
Effective yield (as a percent)           8.80% 8.90%  
5.950% notes, issued in September 2006 and due in September 2016                
Debt instrument                
Total principal amount             $ 275,000  
Interest rate (as a percent)   5.95%       5.95% 5.95%  
Principal payments on notes payable   $ 275,000            
5.375% notes, issued in September 2005 and due in September 2017                
Debt instrument                
Total principal amount           $ 175,000 $ 175,000  
Interest rate (as a percent)           5.375% 5.375%  
2.000% notes, issued in October 2012 and due in January 2018                
Debt instrument                
Total principal amount           $ 350,000 $ 350,000  
Interest rate (as a percent)           2.00% 2.00%  
6.750% notes, issued in September 2007 and due in August 2019                
Debt instrument                
Total principal amount           $ 550,000 $ 550,000  
Interest rate (as a percent)           6.75% 6.75%  
5.750% notes, issued in June 2010 and due in January 2021                
Debt instrument                
Total principal amount           $ 250,000 $ 250,000  
Interest rate (as a percent)           5.75% 5.75%  
3.250% notes, issued in October 2012 and due in October 2022                
Debt instrument                
Total principal amount           $ 450,000 $ 450,000  
Interest rate (as a percent)           3.25% 3.25%  
4.650% notes, issued in July 2013 and due in August 2023                
Debt instrument                
Total principal amount           $ 750,000 $ 750,000  
Interest rate (as a percent)           4.65% 4.65%  
3.875% notes, issued in June 2014 and due in July 2024                
Debt instrument                
Total principal amount         $ 350,000 $ 350,000 $ 350,000  
Interest rate (as a percent)         3.875% 3.875% 3.875%  
Percentage price paid to the investor         99.956%      
Effective yield (as a percent)         3.88%      
Proceeds from issuance of debt         $ 346,700      
4.125% notes, issued in September 2014 and due in October 2026                
Debt instrument                
Total principal amount       $ 250,000   $ 250,000 $ 250,000  
Interest rate (as a percent)       4.125%   4.125% 4.125%  
Percentage price paid to the investor       99.499%        
Effective yield (as a percent)       4.178%        
Proceeds from issuance of debt       $ 246,400        
3.000% notes, issued in October 2016 and due in January 2027                
Debt instrument                
Total principal amount $ 600,000         $ 600,000    
Interest rate (as a percent) 3.00%         3.00%    
Percentage price paid to the investor 98.671%              
Effective yield (as a percent) 3.153%              
Proceeds from issuance of debt $ 586,700              
5.875% bonds, $100 issued in March 2005 and $150 issued in June 2011, both due in March 2035                
Debt instrument                
Total principal amount           $ 250,000 $ 250,000  
Interest rate (as a percent)           5.875% 5.875%  
5.875% bonds, issued in March 2005 and due in March 2035                
Debt instrument                
Total principal amount           $ 100 $ 100  
5.875% bonds, issued in June 2011 and due in March 2035                
Debt instrument                
Total principal amount           $ 150 150  
Notes and bonds payable                
Debt instrument                
Weighted average interest rate           4.40%    
Weighted average remaining years until maturity           6 years 7 months 6 days    
Interest incurred on notes and bonds           $ 171,500 $ 179,500 $ 166,500
Notes and bonds payable | Minimum                
Debt instrument                
Debt service coverage ratio           1.5    
Total unencumbered assets as a percentage of outstanding unsecured debt           150.00%    
Notes and bonds payable | Maximum                
Debt instrument                
Debt to total adjusted assets ratio (as a percent)           60.00%    
Secured debt to total adjusted assets ratio (as a percent)           40.00%    
5.5% notes, issued in November 2003 and due in November 2015                
Debt instrument                
Interest rate (as a percent)     5.50%          
Principal payments on notes payable     $ 150,000