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Fair Value of Financial Instruments - Assets Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair value of financial instruments    
Long term investments $ 287,663 $ 187,716 [1]
Fair Value, Recurring | Estimate of Fair Value Measurement    
Fair value of financial instruments    
Cash and cash equivalents 3,346,204 3,213,376
Debt securities (government) 504,484 442,667
Long term investments 287,663 187,716
Total assets 4,138,351 3,843,759
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring    
Fair value of financial instruments    
Cash and cash equivalents 3,346,204 3,213,376
Debt securities (government) 0 0
Long term investments 287,663 187,716
Total assets 3,633,867 3,401,092
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair value of financial instruments    
Cash and cash equivalents 0 0
Debt securities (government) 504,484 442,667
Long term investments 0 0
Total assets 504,484 442,667
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair value of financial instruments    
Cash and cash equivalents 0 0
Debt securities (government) 0 0
Long term investments 0 0
Total assets $ 0 $ 0
[1] The condensed consolidated balance sheet at December 31, 2023 has been derived from the audited consolidated financial statements at that date.