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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, 2017
USD ($)
Cash, Cash Equivalents And Investments [Abstract]  
Due in one year or less $ 84,143
Due after one year through five years 1,293
Total investments in debt securities $ 85,436