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Marketable Securities (Schedule Of Aggregate Maturities Of Marketable Securities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Marketable Securities [Abstract] |  |
Less than 1 year - Amortized cost |  |
1-3 years - Amortized cost | 3,515 |
3-5 years - Amortized cost | 91 |
More than 5 years | 113 |
Amortized Cost | 3,719 | 12,988
Less than 1 year - Gross unrealized gain |  |
1-3 years - Gross unrealized gain | 250 |
3-5 years - Gross unrealized gain | 46 |
After 5 years - Gross unrealized gain | 53 |
Gross unrealized gain | 349 | 393
Less than 1 year - Fair market value |  |
1-3 years - Fair market value | 3,765 |
3-5 years - Fair market value | 137 |
More than 5 years - Fair market value | 166 |
Fair market value | $ 4,068 | $ 13,381

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