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Notes Payable - Note Repayment (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Nov. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt              
Loss on extinguishment of debt         $ (42,426)    
Principal payments on notes payable         725,000 $ 275,000 $ 150,000
Notes Payable | 6.750% notes, issued in September 2007 and due in August 2019              
Debt              
Early repayment of notes payable         $ 550,000    
Interest rate (as a percent) 6.75%       6.75% 6.75%  
Loss on extinguishment of debt $ (42,400)            
Dilution in earnings per common share due to loss on extinguishment of debt $ (0.15)            
Notes Payable | 5.375% notes, issued in September 2005 and due in September 2017              
Debt              
Interest rate (as a percent)   5.375%       5.375%  
Principal payments on notes payable   $ 175,000          
Notes Payable | 5.950% notes, issued in September 2006 and due in September 2016              
Debt              
Interest rate (as a percent)     5.95%        
Principal payments on notes payable     $ 275,000        
Notes Payable | 5.500% notes, issued in November 2003 and due in November 2015              
Debt              
Interest rate (as a percent)       5.50%      
Principal payments on notes payable       $ 150,000