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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
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt            
Principal payments on notes payable       $ 0 $ 350,000 $ 725,000
Loss on extinguishment of debt       $ 0 $ 0 $ (42,426)
Notes Payable | 2.000% notes, issued in October 2012 and due in January 2018            
Debt            
Principal payments on notes payable $ 350,000          
Stated interest rate (as a percent) 2.00%          
Notes Payable | 6.750% notes, issued in September 2007 and due in August 2019            
Debt            
Early repayment of notes payable   $ 550,000        
Stated 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      
Stated interest rate (as a percent)     5.375%