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Marketable Securities (Investments With Continuous Unrealized Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value $ 465,292 $ 376,990
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (4,010) (2,512)
Investments with continuous unrealized losses for 12 months or greater, Fair value 42,231 20,833
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (213) (51)
Total Investments with continuous unrealized losses, Fair value 507,523 397,823
Total Investments with continuous unrealized losses, Unrealized losses (4,223) (2,563)
Government And Corporate Debentures - Fixed Interest Rate [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value 267,326 195,784
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (2,225) (1,816)
Investments with continuous unrealized losses for 12 months or greater, Fair value 27,490  
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (69)  
Total Investments with continuous unrealized losses, Fair value 294,816 195,784
Total Investments with continuous unrealized losses, Unrealized losses (2,294) (1,816)
Government-Sponsored Enterprises [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value 131,540 122,574
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (151) (649)
Investments with continuous unrealized losses for 12 months or greater, Fair value   4,999
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses   (3)
Total Investments with continuous unrealized losses, Fair value 131,540 127,572
Total Investments with continuous unrealized losses, Unrealized losses (151) (652)
Government And Corporate Debentures - Floating Interest Rate [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value 66,426 58,632
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (1,634) (47)
Investments with continuous unrealized losses for 12 months or greater, Fair value 14,741 15,834
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (144) (48)
Total Investments with continuous unrealized losses, Fair value 81,167 74,467
Total Investments with continuous unrealized losses, Unrealized losses $ (1,778) $ (95)