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Notes Payable (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt instrument    
Total principal amount $ 3,650,000 $ 3,650,000
Unamortized original issuance discounts and deferred financing costs (31,000) (32,000)
Notes payable, net 3,619,149 3,617,973
Maturity of notes and bonds payable    
2016 275,000  
2017 175,000  
2018 350,000  
2019 550,000  
Thereafter 2,300,000  
Totals 3,650,000  
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
Interest rate (as a percent) 3.875% 3.875%
4.125% notes, issued in September 2014 and due in October 2026    
Debt instrument    
Total principal amount $ 250,000 $ 250,000
Interest rate (as a percent) 4.125% 4.125%
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 4.70%  
Weighted average remaining years until maturity 6 years 2 months 12 days