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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2011
Marketable Securities [Abstract] |
Schedule Of Marketable Securities With Contractual Maturities |
|  | December 31, |
|  | 2010 |  |  | 2011 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |  |  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Government and corporate debentures - fixed interest rate |  | $ | 313,939 |  |  | $ | 2,372 |  |  | $ | (85 | ) |  | $ | 316,226 |  |  | $ | 504,749 |  |  | $ | 3,534 |  |  | $ | (237 | ) |  | $ | 508,046 |
Government-sponsored enterprises |  |  | 142,496 |  |  |  | 504 |  |  |  | (100 | ) |  |  | 142,900 |  |  |  | 40,088 |  |  |  | 238 |  |  |  | — |  |  |  | 40,326 |
Government and corporate debentures - floating interest rate |  |  | 78,505 |  |  |  | 97 |  |  |  | (10 | ) |  |  | 78,592 |  |  |  | 95,086 |  |  |  | 129 |  |  |  | (48 | ) |  |  | 95,167 |
|  | $ | 534,940 |  |  | $ | 2,973 |  |  | $ | (195 | ) |  | $ | 537,718 |  |  | $ | 639,923 |  |  | $ | 3,901 |  |  | $ | (285 | ) |  | $ | 643,539 |
|  | December 31, |
|  | 2010 |  |  | 2011 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |  |  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Government and corporate debentures - fixed interest rate |  | $ | 990,454 |  |  | $ | 18,421 |  |  | $ | (1,731 | ) |  | $ | 1,007,144 |  |  | $ | 1,103,254 |  |  | $ | 14,854 |  |  | $ | (2,058 | ) |  | $ | 1,116,050 |
Government-sponsored enterprises |  |  | 189,085 |  |  |  | 1,366 |  |  |  | (552 | ) |  |  | 189,899 |  |  |  | 295,235 |  |  |  | 2,061 |  |  |  | (151 | ) |  |  | 297,145 |
Government and corporate debentures - floating interest rate |  |  | 120,206 |  |  |  | 297 |  |  |  | (85 | ) |  |  | 120,418 |  |  |  | 102,161 |  |  |  | 160 |  |  |  | (1,729 | ) |  |  | 100,592 |
Auction rate securities (*) |  |  | 7,990 |  |  |  | — |  |  |  | — |  |  |  | 7,990 |  |  |  | 6,078 |  |  |  | — |  |  |  | — |  |  |  | 6,078 |
|  | $ | 1,307,735 |  |  | $ | 20,084 |  |  | $ | (2,368 | ) |  | $ | 1,325,451 |  |  | $ | 1,506,728 |  |  | $ | 17,075 |  |  | $ | (3,938 | ) |  | $ | 1,519,865 |
Investments With Continuous Unrealized Losses |
|  | December 31, 2010 |
|  | Investments with continuous unrealized losses for less than 12 months |  |  | Investments with continuous unrealized losses for 12 months or greater |  |  | Total Investments with continuous unrealized losses |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |
Government and corporate debentures - fixed interest rate |  | $ | 195,784 |  |  | $ | (1,816 | ) |  | $ | — |  |  | $ | — |  |  | $ | 195,784 |  |  | $ | (1,816 | )
Government-sponsored enterprises |  |  | 122,574 |  |  |  | (649 | ) |  |  | 4,999 |  |  |  | (3 | ) |  |  | 127,572 |  |  |  | (652 | )
Government and corporate debentures - floating interest rate |  |  | 58,632 |  |  |  | (47 | ) |  |  | 15,834 |  |  |  | (48 | ) |  |  | 74,467 |  |  |  | (95 | )
|  | $ | 376,990 |  |  | $ | (2,512 | ) |  | $ | 20,833 |  |  | $ | (51 | ) |  | $ | 397,823 |  |  | $ | (2,563 | )
|  | December 31, 2011 |
|  | Investments with continuous unrealized losses for less than 12 months |  |  | Investments with continuous unrealized losses for 12 months or greater |  |  | Total Investments with continuous unrealized losses |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |
Government and corporate debentures - fixed interest rate |  | $ | 267,326 |  |  | $ | (2,225 | ) |  | $ | 27,490 |  |  | $ | (69 | ) |  | $ | 294,816 |  |  | $ | (2,294 | )
Government-sponsored enterprises |  |  | 131,540 |  |  |  | (151 | ) |  |  | — |  |  |  | — |  |  |  | 131,540 |  |  |  | (151 | )
Government and corporate debentures - floating interest rate |  |  | 66,426 |  |  |  | (1,634 | ) |  |  | 14,741 |  |  |  | (144 | ) |  |  | 81,167 |  |  |  | (1,778 | )
|  | $ | 465,292 |  |  | $ | (4,010 | ) |  | $ | 42,231 |  |  | $ | (213 | ) |  | $ | 507,523 |  |  | $ | (4,223 | )

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- Definition Tabular disclosure of available-for-sale securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities may include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities may include, among other things, common stock, warrant rights, call options, and put options, but do not include convertible debt. + References No definition available. + Details
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- Details
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- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
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