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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019
Statement of Comprehensive Income [Abstract] |  |  |  |
Net change with respect to derivative instruments and hedging activities, tax (expense) benefit | $ (43) | $ 56 | $ (53) | $ (34)
Net actuarial loss on pension and postretirement obligations, tax benefit (expense) | 92 | (232) | 224 | (323)
Attributable to unconsolidated affiliates, tax benefit (expense) | $ (99) | $ (159) | $ 163 | $ (240)

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- Definition Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 + Details
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