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Accumulated Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2013
Accumulated Other Comprehensive Loss | At June 30, 2013 and December 31, 2012, the accumulated other comprehensive income balances were as follows:
|  | June 30, 2013 |  |  | December 31, 2012 |
|  | (in thousands) |
Retirement plans prior service benefit, net of tax of $(125) and $(125) |  | $ | 2,678 |  |  | $ | 2,895 |
Unrealized gains on marketable securities, net of tax of $835 and $835 |  |  | 601 |  |  |  | 2,925 |
Total accumulated other comprehensive income |  | $ | 3,279 |  |  | $ | 5,820 |
Reclassifications out of Accumulated Other Comprehensive Income | Reclassifications out of accumulated other comprehensive income to the statement of operations for the three and six months ended June 30, 2013 and July 1, 2012, were as follows:
Details about Accumulated Other Comprehensive Income Components |  | For the Three Months Ended |  |  | For the Six Months Ended |  |  | Affected Line Item in the Statements of Operations |
|  | June 30, 2013 |  |  | July 1, 2012 |  |  | June 30, 2013 |  |  | July 1, 2012 |  |  |  |
|  | (in thousands) |  |  | (in thousands) |  |  |  |
Available-for-sale marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains |  | $ | 143 |  |  | $ | 24 |  |  | $ | 419 |  |  | $ | 490 |  |  |  | Interest income |
|  | $ | 143 |  |  | $ | 24 |  |  | $ | 419 |  |  | $ | 490 |  |  |  | Net income |
Amortization of defined benefit pension and postretirement plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service benefit |  | $ | 109 |  |  | $ | 92 |  |  | $ | 217 |  |  | $ | 183 |  |  |  | (a) |
|  | $ | 109 |  |  | $ | 92 |  |  | $ | 217 |  |  | $ | 183 |  |  |  | (a) |
Total reclassifications |  | $ | 252 |  |  | $ | 116 |  |  | $ | 636 |  |  | $ | 673 |  |  |  | Net income |
(a) | The amortization of prior service benefit is included in the computation of net periodic pension and postretirement benefit costs; see Note M “Retirement Plans.”

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e526-108580 + Details
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