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Notes Payable - Note Repayment Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Debt        
Loss on extinguishment of debt     $ 46,473 $ 9,819
Notes payable | 3.250% notes, $450 issued in October 2012 and $500 issued in December 2017, both due in October 2022        
Debt        
Early redemption of notes payable $ 950,000      
Interest rate (as a percent) 3.25%   3.25%  
Loss on extinguishment of debt     $ 46,500  
Notes payable | 5.750% notes, issued in June 2010 and due in January 2021        
Debt        
Early redemption of notes payable   $ 250,000    
Interest rate (as a percent)   5.75%    
Loss on extinguishment of debt       $ 9,800