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Other Income - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Schedule Of Other Income [Line Items]    
Gain on the sale of real estate $ (30) $ 350
Proceeds from sale of real estate $ 50 399
Sweden [Member]    
Schedule Of Other Income [Line Items]    
Gain on the sale of real estate   317
Proceeds from sale of real estate   $ 368