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Financial Instruments And Marketable Securities (Future Maturities Of Available-For-Sale Securities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011
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Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale securities, Amortized cost, maturities less than twelve months | $ 27,048
Available-for-sale securities, Fair value, maturities less than twelve months | 27,165
Available-for-sale securities, Amortized cost, maturities greater than twelve months | 0
Available-for-sale securities, Fair value, maturities greater than twelve months | 0
Common Stock [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale securities, Amortized cost, maturities less than twelve months | 197
Available-for-sale securities, Fair value, maturities less than twelve months | 320
Available-for-sale securities, Amortized cost, maturities greater than twelve months | 0
Available-for-sale securities, Fair value, maturities greater than twelve months | 0
Government And Agency Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale securities, Amortized cost, maturities less than twelve months | 26,851
Available-for-sale securities, Fair value, maturities less than twelve months | 26,845
Available-for-sale securities, Amortized cost, maturities greater than twelve months | 0
Available-for-sale securities, Fair value, maturities greater than twelve months | $ 0

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