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Investments - Available-for-sale securities, Unrealized Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Fair Value of Investments with Unrealized Losses, Less than 12 months $ 530,680  
Gross Unrealized Losses, Less than 12 months (2,155)  
Fair Value of Investments with Unrealized Losses,12 months or greater 509,447 $ 0
Gross Unrealized Losses, 12 months or greater (20,634)  
Fair Value of Investments with Unrealized Losses 1,040,127 $ 969,000
Gross Unrealized Losses (22,789)  
Corporate bonds    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Fair Value of Investments with Unrealized Losses, Less than 12 months 39,047  
Gross Unrealized Losses, Less than 12 months (1,186)  
Fair Value of Investments with Unrealized Losses,12 months or greater 152,837  
Gross Unrealized Losses, 12 months or greater (5,924)  
Fair Value of Investments with Unrealized Losses 191,884  
Gross Unrealized Losses (7,110)  
U.S. Treasuries    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Fair Value of Investments with Unrealized Losses, Less than 12 months 491,633  
Gross Unrealized Losses, Less than 12 months (969)  
Fair Value of Investments with Unrealized Losses,12 months or greater 356,610  
Gross Unrealized Losses, 12 months or greater (14,710)  
Fair Value of Investments with Unrealized Losses 848,243  
Gross Unrealized Losses $ (15,679)