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MARKETABLE SECURITIES | 12 Months Ended
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Dec. 31, 2013
MARKETABLE SECURITIES |
MARKETABLE SECURITIES | (5) MARKETABLE SECURITIES A summary of marketable securities is shown below:
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
|  | (In thousands) |
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and municipal obligations |  |  |  |  |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 55,531 |  | $ | 27 |  | $ | (4 | ) | $ | 55,554 |
Maturing after one year through three years |  |  | 18,234 |  |  | 56 |  |  | (4 | ) |  | 18,286 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total U.S. government and municipal obligations |  | $ | 73,765 |  | $ | 83 |  | $ | (8 | ) | $ | 73,840 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 38,973 |  | $ | 9 |  | $ | (9 | ) | $ | 38,973 |
Maturing after one year through three years |  |  | 20,761 |  |  | 12 |  |  | (5 | ) |  | 20,768 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total corporate debt securities |  | $ | 59,734 |  | $ | 21 |  | $ | (14 | ) | $ | 59,741 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total marketable securities |  | $ | 133,499 |  | $ | 104 |  | $ | (22 | ) | $ | 133,581 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | 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 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
The marketable securities held by the Company were high investment grade and there were no marketable securities that the Company considered to be other-than-temporarily impaired as of December 31, 2013.

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