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Notes Payable - Note Repayment Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt            
Loss on extinguishment of debt     $ 0 $ 0 $ 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%   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