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Marketable Securities (Schedule Of Marketable Securities) (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] |  |  |  |
Amortized cost less than one year | $ 639,923 |  | $ 534,940 |
Gross unrealized gains less than one year | 3,901 |  | 2,973 |
Gross unrealized losses less than one year | (285) |  | (195) |
Fair value less than one year | 643,539 |  | 537,718 |
Amortized cost, over one year through five years | 1,506,728 |  | 1,307,735 |
Gross unrealized gains, over one year through five years | 17,075 |  | 20,084 |
Gross unrealized losses, over one year through five years | (3,938) |  | (2,368) |
Fair value, over one year through five years | 1,519,865 |  | 1,325,451 |
Government And Corporate Debentures - Fixed Interest Rate [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized cost less than one year | 504,749 |  | 313,939 |
Gross unrealized gains less than one year | 3,534 |  | 2,372 |
Gross unrealized losses less than one year | (237) |  | (85) |
Fair value less than one year | 508,046 |  | 316,226 |
Amortized cost, over one year through five years | 1,103,254 |  | 990,454 |
Gross unrealized gains, over one year through five years | 14,854 |  | 18,421 |
Gross unrealized losses, over one year through five years | (2,058) |  | (1,731) |
Fair value, over one year through five years | 1,116,050 |  | 1,007,144 |
Government-Sponsored Enterprises [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized cost less than one year | 40,088 |  | 142,496 |
Gross unrealized gains less than one year | 238 |  | 504 |
Gross unrealized losses less than one year |  |  | (100) |
Fair value less than one year | 40,326 |  | 142,900 |
Amortized cost, over one year through five years | 295,235 |  | 189,085 |
Gross unrealized gains, over one year through five years | 2,061 |  | 1,366 |
Gross unrealized losses, over one year through five years | (151) |  | (552) |
Fair value, over one year through five years | 297,145 |  | 189,899 |
Government And Corporate Debentures - Floating Interest Rate [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized cost less than one year | 95,086 |  | 78,505 |
Gross unrealized gains less than one year | 129 |  | 97 |
Gross unrealized losses less than one year | (48) |  | (10) |
Fair value less than one year | 95,167 |  | 78,592 |
Amortized cost, over one year through five years | 102,161 |  | 120,206 |
Gross unrealized gains, over one year through five years | 160 |  | 297 |
Gross unrealized losses, over one year through five years | (1,729) |  | (85) |
Fair value, over one year through five years | 100,592 |  | 120,418 |
Auction Rate Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized cost, over one year through five years | 6,078 | [1] | 7,990 | [1]
Fair value, over one year through five years | $ 6,078 | [1] | $ 7,990 | [1]
[1] | The balance in 2010 was comprised of four auction rate securities, which have suffered from failed auctions since September 2007. During 2011 two of these securities were sold. As a result of the auction failures these auction rate securities do not have a readily determinable market value. As such, since 2008, the Company determines the fair values of these securities with the assistance of third- party valuating specialists (see Note 5).

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- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature after one year and through five years from the balance sheet date 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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph b -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 Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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