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Marketable Securities (Summary Of Investment Securities In An Unrealized Loss Position) (Details) (Corporate Debt Securities And Government Debt Securities [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2012
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Corporate Debt Securities And Government Debt Securities [Member] |
Unrealized Losses, Less than 12 months | $ (106)
Unrealized Losses, 12 months or more | (76)
Unrealized Losses, Total | (182)
Fair Value, Less than 12 months | 6,803
Fair Value,12 months or more | 10,701
Fair Value, Total | $ 17,504

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