XML 41 R23.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Marketable Securities (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2013
Marketable Securities |
Summary of marketable securities |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
|  | (In thousands) |
March 31, 2013 |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |
U.S. government and municipal obligations |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 21,016 |  | $ | 30 |  | $ | — |  | $ | 21,046 |
Maturing after one year through three years |  | 17,470 |  | 84 |  | 1 |  | 17,553 |
Total U.S. government and municipal obligations |  | $ | 38,486 |  | $ | 114 |  | $ | 1 |  | $ | 38,599 |
Corporate debt securities |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 23,909 |  | $ | 24 |  | $ | 10 |  | $ | 23,923 |
Maturing after one year through three years |  | 44,253 |  | 6 |  | 31 |  | 44,228 |
Total corporate debt securities |  | $ | 68,162 |  | $ | 30 |  | $ | 41 |  | $ | 68,151 |
Total marketable securities |  | $ | 106,648 |  | $ | 144 |  | $ | 42 |  | $ | 106,750 |
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 |

X
- Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration