Annual report pursuant to Section 13 and 15(d)

Short-Term And Long-Term Investments And Restricted Deposits (Narrative) (Details)

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Short-Term And Long-Term Investments And Restricted Deposits (Narrative) (Details)
Dec. 31, 2013
positions
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