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Marketable Securities | 12 Months Ended
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Dec. 31, 2011
Marketable Securities [Abstract] |
Marketable Securities |
NOTE 4:- | MARKETABLE SECURITIES
Marketable securities with contractual maturities of less than one year are as follows:
|  | December 31, |
|  | 2010 |  |  | 2011 |
|  | Amortized |  |  | Gross unrealized |  |  | Gross unrealized |  |  | Market |  |  | Amortized |  |  | Gross unrealized |  |  | Gross unrealized |  |  | Market |
|  | cost |  |  | losses |  |  | gains |  |  | value |  |  | cost |  |  | losses |  |  | gains |  |  | Value |
Foreign banks and government debentures |  | $ | 17,444 |  |  | $ | - |  |  | $ | 105 |  |  | $ | 17,549 |  |  | $ | 6,162 |  |  | $ | (46 | ) |  | $ | 7 |  |  | $ | 6,123 |
Corporate debentures |  |  | 6,628 |  |  |  | - |  |  |  | 23 |  |  |  | 6,651 |  |  |  | 4,212 |  |  |  | (4 | ) |  |  | 3 |  |  |  | 4,211 |
Total available-for-sale marketable securities |  | $ | 24,072 |  |  | $ | - |  |  | $ | 128 |  |  | $ | 24,200 |  |  | $ | 10,374 |  |  | $ | (50 | ) |  | $ | 10 |  |  | $ | 10,334 |
Marketable securities with contractual maturities from one to three years are as follows:
|  | December 31, |
|  | 2010 |  |  | 2011 |
|  | Amortized |  |  | Gross unrealized |  |  | Gross unrealized |  |  | Market |  |  | Amortized |  |  | Gross unrealized |  |  | Gross unrealized |  |  | Market |
|  | cost |  |  | losses |  |  | gains |  |  | value |  |  | cost |  |  | Losses |  |  | gains |  |  | Value |
Foreign banks and government debentures |  | $ | 32,985 |  |  | $ | (81 | ) |  | $ | 333 |  |  | $ | 33,237 |  |  | $ | 34,989 |  |  | $ | (645 | ) |  | $ | 33 |  |  | $ | 34,377 |
Corporate debentures |  |  | 17,272 |  |  |  | (6 | ) |  |  | 175 |  |  |  | 17,441 |  |  |  | 16,720 |  |  |  | (28 | ) |  |  | 204 |  |  |  | 16,896 |
Total available-for-sale marketable securities |  | $ | 50,257 |  |  | $ | (87 | ) |  | $ | 508 |  |  | $ | 50,678 |  |  | $ | 51,709 |  |  | $ | (673 | ) |  | $ | 237 |  |  | $ | 51,273 |
Marketable securities with contractual maturities of more than three years are as follows:
|  | December 31, |
|  | 2010 |  |  | 2011 |
|  | Amortized |  |  | Gross unrealized |  |  | Gross unrealized |  |  | Market |  |  | Amortized |  |  | Gross unrealized |  |  | Gross unrealized |  |  | Market |
|  | cost |  |  | losses |  |  | gains |  |  | value |  |  | cost |  |  | Losses |  |  | gains |  |  | Value |
U.S. Government debentures |  | $ | 2,510 |  |  | $ | (31 | ) |  | $ | - |  |  | $ | 2,479 |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Foreign banks and government debentures |  |  | 19,276 |  |  |  | (275 | ) |  |  | 15 |  |  |  | 19,016 |  |  |  | 33,623 |  |  |  | (1,426 | ) |  |  | 85 |  |  |  | 32,282 |
Corporate debentures |  |  | 10,824 |  |  |  | (137 | ) |  |  | 4 |  |  |  | 10,691 |  |  |  | 18,935 |  |  |  | (129 | ) |  |  | 283 |  |  |  | 19,089 |
Total available-for-sale marketable securities |  | $ | 32,610 |  |  | $ | (443 | ) |  | $ | 19 |  |  | $ | 32,186 |  |  | $ | 52,558 |  |  | $ | (1,555 | ) |  | $ | 368 |  |  | $ | 51,371 |
Investments with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values were as follows:
|  | 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 |
Foreign banks and government debentures |  | $ | 49,510 |  |  | $ | (1,999 | ) |  | $ | 6,858 |  |  | $ | (116 | ) |  | $ | 56,368 |  |  | $ | (2,115 | )
Corporate debentures |  |  | 8,943 |  |  |  | (152 | ) |  |  | 1,594 |  |  |  | (10 | ) |  |  | 10,537 |  |  |  | (162 | )
Total available-for-sale marketable securities |  | $ | 58,453 |  |  | $ | (2,151 | ) |  | $ | 8,452 |  |  | $ | (126 | ) |  | $ | 66,905 |  |  | $ | (2,277 | )
|  | 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 |
U.S. Government debentures |  | $ | 2,479 |  |  | $ | (31 | ) |  | $ | - |  |  | $ | - |  |  | $ | 2,479 |  |  | $ | (31 | )
Foreign banks and government debentures |  |  | 25,354 |  |  |  | (356 | ) |  |  | - |  |  |  | - |  |  |  | 25,354 |  |  |  | (356 | )
Corporate debentures |  |  | 10,896 |  |  |  | (143 | ) |  |  | - |  |  |  | - |  |  |  | 10,896 |  |  |  | (143 | )
Total available-for-sale marketable securities |  | $ | 38,729 |  |  | $ | (530 | ) |  | $ | - |  |  | $ | - |  |  | $ | 38,729 |  |  | $ | (530 | )
As of December 31, 2010 and 2011, interest receivable amounted to $ 1,271 and $ 1,274, respectively, and is included within available for sale marketable securities in the balance sheets.

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