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Cash, Cash Equivalents and Investments (Summary of Contractual Maturities of Cash Equivalents and Available-for-Sale Investments) (Details) $ in Thousands | Sep. 30, 2021 USD ($)
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Cash, Cash Equivalents and Investments [Abstract] |
Due in one year or less | $ 404,995
Due after one year through 5 years | 310,875
Total investments | $ 715,870

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