Quarterly report pursuant to Section 13 or 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) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
positions
Sep. 30, 2012
Investments, Debt and Equity Securities [Abstract]    
Percentage of investments in securities recorded at fair value that carry a rating by Moody's or S&P of AAA/Aaa 47.00%  
Percentage of investments in securities recorded at fair value that carry a rating by Moody's or S&P of AA-/Aa3 or higher 66.00%  
Percentage of investments in securities recorded at fair value that carry a rating by Moody's or S&P of A-/A3 or higher 94.00%  
Positions from which gross unrealized losses were generated 89  
Total positions 356  
Investment amortization $ 7,612 $ 8,676