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Changes in shareholders' equity - Accumulated other comprehensive income into income expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 25, 2016 | Sep. 27, 2015 | Sep. 25, 2016 | Sep. 27, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Cost of goods sold | $ (214,046) | $ (215,501) | $ (630,946) | $ (641,102)
Total reclassifications, net of tax | 1,535 | 1,967 | 6,312 | 4,267
Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Cost of goods sold | 535 | 1,168 | 3,907 | 1,431
Total before tax | 535 | 1,168 | 3,907 | 1,431
Tax benefit | (187) | (221) | (891) | (321)
Total reclassifications, net of tax | 348 | 947 | 3,016 | 1,110
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total before tax | 1,829 | 1,571 | 5,071 | 4,782
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total before tax | 15 | 0 | 43 | 0
Pension and Other Postretirement Benefits Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total before tax | 1,844 | 1,571 | 5,114 | 4,782
Tax benefit | (657) | (551) | (1,818) | (1,625)
Total reclassifications, net of tax | $ 1,187 | $ 1,020 | $ 3,296 | $ 3,157

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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