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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2013
Marketable Securities |
Summary of marketable securities |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
|  | (In thousands) |
September 30, 2013 |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |
U.S. government and municipal obligations |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 50,900 |  | $ | 32 |  | $ | (3 | ) | $ | 50,929 |
Maturing after one year through three years |  | 14,104 |  | 63 |  | (2 | ) | 14,165 |
Total U.S. government and municipal obligations |  | $ | 65,004 |  | $ | 95 |  | $ | (5 | ) | $ | 65,094 |
Corporate debt securities |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 36,001 |  | $ | 13 |  | $ | (4 | ) | $ | 36,010 |
Maturing after one year through three years |  | 20,857 |  | 9 |  | (8 | ) | 20,858 |
Total corporate debt securities |  | $ | 56,858 |  | $ | 22 |  | $ | (12 | ) | $ | 56,868 |
Total marketable securities |  | $ | 121,862 |  | $ | 117 |  | $ | (17 | ) | $ | 121,962 |
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 |

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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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