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Notes Payable (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Debt instrument        
Total principal amount     $ 3,800,000 $ 3,800,000
Unamortized original issuance discounts     (14,000) (15,000)
Notes payable, net     3,786,408 3,785,372
Proceeds from Issuance of Debt     250,000  
Maturity of notes and bonds payable        
2015     150,000  
2016     275,000  
2017     175,000  
2018     350,000  
2019     550,000  
Thereafter     2,300,000  
Totals     3,800,000  
5.5% notes, issued in November 2003 and due in November 2015        
Debt instrument        
Total principal amount     $ 150,000 $ 150,000
Interest rate (as a percent)     5.50% 5.50%
5.95% notes, issued in September 2006 and due in September 2016        
Debt instrument        
Total principal amount     $ 275,000 $ 275,000
Interest rate (as a percent)     5.95% 5.95%
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%
2.0% 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%
6.75% 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%
5.75% 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%
3.25% 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%
4.65% 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      
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        
Issuance of Debt     $ 100,000 $ 100,000
5.875% bonds, issued in June 2011 and due in March 2035        
Debt instrument        
Issuance of Debt     $ 150,000 $ 150,000
Notes and bonds payable        
Debt instrument        
Weighted average interest rate     4.80%  
Weighted average remaining years until maturity     6 years 6 months