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Intangible assets (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of Intangible Assets $ 10,971 $ 11,038 $ 11,195