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Intangible assets (Major Components) (Details) - USD ($) $ in Thousands | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | $ 212,764 | $ 213,095 |
Accumulated amortization | 51,789 | 41,036 |
Net book value | 160,975 | 172,059 | $ 183,524
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 210,845 | 211,176 |
Accumulated amortization | 49,937 | 39,274 |
Net book value | 160,908 | 171,902 | 183,258
Patents, Trademarks and Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 1,919 | 1,919 |
Accumulated amortization | 1,852 | 1,762 |
Net book value | $ 67 | $ 157 | $ 266

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