XML 63 R23.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Marketable Securities (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2013
Marketable Securities |
Summary of marketable securities |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
|  | (In thousands) |
June 30, 2013 |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |
U.S. government and municipal obligations |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 34,189 |  | $ | 15 |  | $ | 5 |  | $ | 34,199 |
Maturing after one year through three years |  | 34,030 |  | 61 |  | 22 |  | 34,069 |
Total U.S. government and municipal obligations |  | $ | 68,219 |  | $ | 76 |  | $ | 27 |  | $ | 68,268 |
Corporate debt securities |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 33,336 |  | $ | 10 |  | $ | 32 |  | $ | 33,314 |
Maturing after one year through three years |  | 27,566 |  | — |  | 65 |  | 27,501 |
Total corporate debt securities |  | $ | 60,902 |  | $ | 10 |  | $ | 97 |  | $ | 60,815 |
Total marketable securities |  | $ | 129,121 |  | $ | 86 |  | $ | 124 |  | $ | 129,083 |
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