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Summary Of Significant Accounting Policies (Marketable Securities - Amortized Cost and Fair Value) (Details) $ in Thousands | Sep. 30, 2016 USD ($)
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Schedule of Available-for-sale Securities [Line Items] |
Amortized cost | $ 49,738
Gross unrealized gains | 0
Gross unrealized losses | (122)
Fair value | 49,616
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis | 18,585
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value | 18,549
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis | 31,153
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value | 31,067
Certificates of Deposit [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized cost | 681
Gross unrealized gains | 0
Gross unrealized losses | 0
Fair value | 681
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized cost | 11,945
Gross unrealized gains | 0
Gross unrealized losses | (20)
Fair value | 11,925
Corporate Bond Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized cost | 34,701
Gross unrealized gains | 0
Gross unrealized losses | (100)
Fair value | 34,601
US Government Agencies Debt Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized cost | 2,411
Gross unrealized gains | 0
Gross unrealized losses | (2)
Fair value | $ 2,409

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