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Cash, Cash Equivalents and Investments (Summary of Contractual Maturities of Cash Equivalents and Available-for-Sale Investments) (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
Cash, Cash Equivalents and Investments [Abstract]  
Due in one year or less $ 574,297
Due after one year through 5 years 306,643
Total investments $ 880,940