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Marketable Securities (Schedule Of Reconciliation Of Marketable Securities) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Marketables Securities [Abstract] |  |  |  |  |
Balance at January 1, 2012 | $ 33,019 | [1] |  |  |
Purchases of marketable securities | 17,992 |  | 13,071 |  | 12,972
Discount of marketable securities | (579) |  | (462) |  | (467)
Proceeds from maturity of marketable securities | (8,955) |  | (9,531) |  | (11,303)
Balance at December 31, 2012 | $ 41,477 | [1] | $ 33,019 | [1] |
[1] | Including accrued interest in the amount of $325K and $425K as of December 31, 2011 and 2012 respectively.

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