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Cash, Cash Equivalents and Investments (Summary of Contractual Maturities of Cash Equivalents and Available-for-Sale Investments) (Details) $ in Thousands | Mar. 31, 2021 USD ($)
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Cash, Cash Equivalents and Investments [Abstract] |
Due in one year or less | $ 236,278
Due after one year through 5 years | 17,588
Total investments | $ 253,866

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