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Cash and Cash Equivalents and Investments (Summary of Contractual Maturities of Cash Equivalents and Available-for-Sale Investments) (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Cash and Cash Equivalents and Investments [Abstract] |
Due in one year or less | $ 82,023
Due after one year through five years | 1,487
Total | $ 83,510

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