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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2014
Marketable Securities |
Summary of marketable securities |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
|  | (In thousands) |
March 31, 2014 |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |
U.S. government and municipal obligations |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 40,967 |  | $ | 32 |  | $ | — |  | $ | 40,999 |
Maturing after one year through three years |  | 43,248 |  | 84 |  | (23 | ) | 43,309 |
Total U.S. government and municipal obligations |  | $ | 84,215 |  | $ | 116 |  | $ | (23 | ) | $ | 84,308 |
Corporate debt securities |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 96,375 |  | $ | 38 |  | $ | (29 | ) | $ | 96,384 |
Maturing after one year through three years |  | 36,651 |  | 12 |  | (31 | ) | 36,632 |
Total corporate debt securities |  | $ | 133,026 |  | $ | 50 |  | $ | (60 | ) | $ | 133,016 |
Total marketable securities |  | $ | 217,241 |  | $ | 166 |  | $ | (83 | ) | $ | 217,324 |
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 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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