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Marketable Securities (Schedule Of Debt Securities By Major Interest Type) (Details) (USD $) In Thousands, unless otherwise specified |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Up To 2% [Member] | Dec. 31, 2012 Up To 2% [Member] Maximum [Member] | Dec. 31, 2012 2.038% - 2.951% [Member] | Dec. 31, 2012 2.038% - 2.951% [Member] Minimum [Member] | Dec. 31, 2012 2.038% - 2.951% [Member] Maximum [Member] | Dec. 31, 2011 Up to 2% [Member] | Dec. 31, 2011 Up to 2% [Member] Maximum [Member] | Dec. 31, 2011 2.038% - 2.874% [Member] | Dec. 31, 2011 2.038% - 2.874% [Member] Minimum [Member] | Dec. 31, 2011 2.038% - 2.874% [Member] Maximum [Member]
Amortized cost | $ 41,477 | [1] | $ 33,019 | [1] | $ 33,145 |  | $ 8,332 |  |  | $ 25,225 |  | $ 7,794 |  |
Net unrealized holding gains/(losses) | 34 |  | (547) |  | (84) |  | 118 |  |  | (415) |  | (132) |  |
Aggregate fair value | $ 41,511 | [2] | $ 32,472 | [2] | $ 33,061 |  | $ 8,450 |  |  | $ 24,810 |  | $ 7,662 |  |
Interest rate |  |  |  |  |  | 2.00% |  | 2.038% | 2.951% |  | 2.00% |  | 2.038% | 2.874%
[1] | Including accrued interest in the amount of $325K and $425K as of December 31, 2011 and 2012 respectively.
[2] | Fair value is being determined using quoted market prices in active markets (Level 1).

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