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Short-Term And Long-Term Investments And Restricted Deposits (Narrative) (Details)
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Dec. 31, 2013
positions
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| Investments, Debt and Equity Securities [Abstract] | |
| Percentage of investments in securities recorded at fair value that carry a rating by S&P or Moody's of AAA/Aaa | 52.00% |
| Percentage of investments in securities recorded at fair value that carry a rating by S&P or Moody's of AA-/Aa3 or higher | 68.00% |
| Percentage of investments in securities recorded at fair value that carry a rating by S&P or Moody's of A-/A3 or higher | 94.00% |
| Positions from which gross unrealized losses were generated | 83 |
| Total number of positions | 343 |