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Notes Payable - Note Repayment (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt              
Principal payments on notes payable         $ 350,000 $ 725,000 $ 275,000
Loss on extinguishment of debt         $ 0 $ (42,426) $ 0
Notes Payable | 2.000% notes, issued in October 2012 and due in January 2018              
Debt              
Principal payments on notes payable $ 350,000            
Interest rate (as a percent) 2.00% 2.00%     2.00% 2.00%  
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%  
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              
Principal payments on notes payable     $ 175,000        
Interest rate (as a percent)     5.375%        
Notes Payable | 5.950% notes, issued in September 2006 and due in September 2016              
Debt              
Principal payments on notes payable       $ 275,000      
Interest rate (as a percent)       5.95%