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Marketable Securities (Investments With Continuous Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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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)

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- Definition This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a -Clause 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a -Clause 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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