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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).