Segment Reporting (Details 1) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 30, 2017
Americas:
Total Americas	$ 201,356	$ 199,355
Total long-lived assets	252,193	251,342
United States [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	200,818	198,744
Other Americas [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	538	611
Asia [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	36,739	37,678
EMEA [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	13,224	13,615
Japan [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	$ 874	$ 694