Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Short-Term Investments (Contractual Maturities) (Details)

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Cash, Cash Equivalents and Short-Term Investments (Contractual Maturities) (Details)
$ in Thousands
Mar. 31, 2016
USD ($)
Years to Maturity  
within One Year $ 95,910
After One Year Through Two Years 2,501
U S Treasury Securities  
Years to Maturity  
within One Year 9,062
U S Government-Sponsored Enterprises Securities  
Years to Maturity  
within One Year 27,737
After One Year Through Two Years 1,499
Corporate Bonds And Commercial Paper  
Years to Maturity  
within One Year 59,111
After One Year Through Two Years $ 1,002