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Investments (Contractual Maturities of Cash Equivalents and Available-for-Sale Debt Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Within 1 year, Amortized Cost | $ 406,551 |
After 1 year through 5 years, Amortized Cost | 109,338 |
Short-term investments, amortized cost | 581,367 |
Within 1 year, Fair Value | 406,346 |
After 1 year through 5 years, Fair Value | 109,601 |
Short-term investments, fair value | 581,573 |
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Asset-backed securities, Amortized Cost | 65,478 |
Short-term investments, amortized cost | 65,340 | $ 25,677
Asset-backed securities, Fair Value | 65,626 |
Short-term investments, fair value | $ 65,488 | $ 25,550

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