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Marketable Securities (Schedule Of Reconciliation Of Marketable Securities) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
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.