Segment Information and Operations By Geographic Area (Schedule Of Long-Lived Asset By Geographic Areas) (Details) - USD ($) $ in Thousands	Sep. 27, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 23,951	$ 29,694
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	10,200	12,453
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	3,982	4,375
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	506	657
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	7,723	10,786
APAC Excluding China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 1,540	$ 1,423