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MARKETABLE SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2012
MARKETABLE SECURITIES |
Summary of marketable securities |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
|  | (In thousands) |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and municipal obligations |  |  |  |  |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 15,566 |  | $ | 28 |  | $ | — |  | $ | 15,594 |
Maturing after one year through three years |  |  | 19,797 |  |  | 99 |  |  | 1 |  |  | 19,895 |
Total U.S. government and municipal obligations |  | $ | 35,363 |  | $ | 127 |  | $ | 1 |  | $ | 35,489 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 17,353 |  | $ | 23 |  | $ | 4 |  | $ | 17,372 |
Maturing after one year through three years |  |  | 6,193 |  |  | 14 |  |  | 3 |  |  | 6,204 |
Total corporate debt securities |  | $ | 23,546 |  | $ | 37 |  | $ | 7 |  | $ | 23,576 |
Total marketable securities |  | $ | 58,909 |  | $ | 164 |  | $ | 8 |  | $ | 59,065 |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
|  | (In thousands) |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and municipal obligations |  |  |  |  |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 19,993 |  | $ | 20 |  | $ | — |  | $ | 20,013 |
Maturing after one year through three years |  |  | 10,808 |  |  | 122 |  |  | 6 |  |  | 10,924 |
Total U.S. government and municipal obligations |  | $ | 30,801 |  | $ | 142 |  | $ | 6 |  | $ | 30,937 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 5,817 |  | $ | 3 |  | $ | 4 |  | $ | 5,816 |
Maturing after one year through three years |  |  | 4,730 |  |  | 2 |  |  | 72 |  |  | 4,660 |
Total corporate debt securities |  | $ | 10,547 |  | $ | 5 |  | $ | 76 |  | $ | 10,476 |
Total marketable securities |  | $ | 41,348 |  | $ | 147 |  | $ | 82 |  | $ | 41,413 |

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