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Fair Value Measurements - Investment by Maturity Dates (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Fair Value Disclosures [Abstract]    
Due in 1 year or less $ 1,494,804  
Due in 1 to 2 years 952,655  
Total debt securities $ 2,447,459 $ 2,322,469