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Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2013
Accumulated Other Comprehensive Loss | At March 31, 2013 and December 31, 2012, the accumulated other comprehensive income balances were as follows:
|  | March 31, 2013 |  |  | December 31, 2012 |
|  | (in thousands) |
Retirement plans prior service benefit, net of tax of $(125) and $(125) |  | $ | 2,786 |  |  | $ | 2,895 |
Unrealized gains on marketable securities, net of tax of $835 and $835 |  |  | 3,013 |  |  |  | 2,925 |
Total accumulated other comprehensive income |  | $ | 5,799 |  |  | $ | 5,820 |
Reclassifications out of Accumulated Other Comprehensive Income | Reclassifications out of accumulated other comprehensive income to the statement of operations for the three months ended March 31, 2013 and April 1, 2012, were as follows:
Details about Accumulated Other Comprehensive Income Components |  | For the Three Months Ended |  |  | Affected Line Item in the Statements of Operations
|  | March 31, 2013 |  |  | April 1, 2012 |  |  |
|  | (in thousands) |  |  |
Available-for-Sale Marketable Securities |  |  |  |  |  |  |  |  |  |
Unrealized gains |  | $ | 275 |  |  | $ | 466 |  |  | Interest income
|  | $ | 275 |  |  | $ | 466 |  |  | Net income
Amortization of Defined Benefit Pension and Postretirement Plans |  |  |
Prior service benefit |  | $ | 109 |  |  | $ | 92 |  |  | (a)
|  | $ | 109 |  |  | $ | 92 |  |  | (a)
Total Reclassifications |  | $ | 384 |  |  | $ | 558 |  |  | 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) including, but not limited to: (a) foreign currency translation adjustments; (b) gains (losses) on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity; (c) gains (losses) on intercompany foreign currency transactions that are of a long-term-investment nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; (d) change in the market value of a futures contract that qualifies as a hedge of an asset reported at fair value; (e) unrealized holding gains (losses) on available-for-sale securities and that resulting from transfers of debt securities from the held-to-maturity category to the available-for-sale category; (f) a net loss recognized as an additional pension liability not yet recognized as net periodic pension cost; and (g) the net gain (loss) and net prior service cost or 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=20435746&loc=d3e526-108580 + Details
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