Segment Reporting (Details 1) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Americas:
Total Americas	$ 197,257	$ 199,355
Total long-lived assets	249,810	251,342
United States [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	196,628	198,744
Other Americas [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	629	611
Asia [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	38,030	37,678
EMEA [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	13,856	13,615
Japan [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	$ 667	$ 694