Quarterly report pursuant to Section 13 or 15(d)

Short-Term And Long-Term Investments And Restricted Deposits (Gross Recorded Realized Gains And Losses) (Details)

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Short-Term And Long-Term Investments And Restricted Deposits (Gross Recorded Realized Gains And Losses) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Investments, Debt and Equity Securities [Abstract]        
Gains $ 1,475 $ 107 $ 1,483 $ 240
Losses (12) (1) (23) (27)
Net realized gains $ 1,463 $ 106 $ 1,460 $ 213