Annual report pursuant to Section 13 and 15(d)

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

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Short-Term And Long-Term Investments And Restricted Deposits (Gross Recorded Realized Gains And Losses On Investments) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Short-Term And Long-Term Investments And Restricted Deposits [Abstract]      
Gross realized gains $ 314 $ 6,036 $ 1,252
Gross realized losses (27) (270) (1,111)
Impairment of investment    (5,531)   
Net realized gains (losses) $ 287 $ 235 $ 141