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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Apr. 05, 2015 | Mar. 30, 2014
Net income | $ 32,787 us-gaap_NetIncomeLoss |  | $ 929 us-gaap_NetIncomeLoss |
Unrealized gains on marketable securities: |  |  |  |
Unrealized gains on marketable securities arising during period, net of tax of $704, $654 | 1,799 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  | 1,139 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |
Less: Reclassification adjustment for gains included in net income, net of tax of $(169), $(102) | (330)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax |  | (176)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total | 1,469 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  | 963 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |
Defined benefit pension and post-retirement plans: |  |  |  |
Amortization of prior service benefit included in net periodic pension and post-retirement expense/income, net of tax of $(42), $(42) | (74)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | [1] | (73)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | [1]
Other comprehensive income | 1,395 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  | 890 us-gaap_OtherComprehensiveIncomeLossNetOfTax |
Comprehensive income | $ 34,182 us-gaap_ComprehensiveIncomeNetOfTax |  | $ 1,819 us-gaap_ComprehensiveIncomeNetOfTax |
[1] | The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note N: "Retirement Plans."

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