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Inventories (Inventory reserve rollforward) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Beginning Balance $ 14,202 $ 6,774
Additions to reserve during the year 10,278 14,029
Reserves applied and inventories written off during the year (14,367) (6,532)
Effect of foreign exchange rate differences (138) (69)
Ending Balance $ 9,975 $ 14,202