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v3.19.1

Shareholders' equity - Change in accumulated other comprehensive income, net of tax (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Apr. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning Balance | $ 2,539,978 | $ 2,430,531
Amounts reclassified from accumulated other comprehensive income | (1,765) | 639
Ending Balance | 2,569,878 | 2,560,500
Cash Flow Hedges |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning Balance | 807 | 340
Other comprehensive income (loss) before reclassifications | (434) | 1,341
Amounts reclassified from accumulated other comprehensive income | (163) | (720)
Net current-period other comprehensive income (loss) | (597) | 621
Ending Balance | 210 | 961
Pension and Other Postretirement Benefit Plans |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning Balance | (131,380) | (138,808)
Other comprehensive income (loss) before reclassifications | (122) | (478)
Amounts reclassified from accumulated other comprehensive income | 1,351 | 1,359
Net current-period other comprehensive income (loss) | 1,229 | 881
Ending Balance | (130,151) | (137,927)
Foreign Currency Translation Adjustment |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning Balance | (210,512) | (126,623)
Other comprehensive income (loss) before reclassifications | (236) | 81,188
Amounts reclassified from accumulated other comprehensive income | 0 | 0
Net current-period other comprehensive income (loss) | (236) | 81,188
Ending Balance | (210,748) | (45,435)
Accumulated Other Comprehensive (Loss) Income |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning Balance | (341,085) | (265,091)
Other comprehensive income (loss) before reclassifications | (792) | 82,051
Amounts reclassified from accumulated other comprehensive income | 1,188 | 639
Net current-period other comprehensive income (loss) | 396 | 82,690
Ending Balance | $ (340,689) | $ (182,401)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
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