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Property, Plant and Equipment, Net (Tables)
3 Months Ended
Mar. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property, plant and equipment, net consisted of the following (in thousands):
 
 
 
March 31,
 
December 30,
 
 
 
2017
 
2016
 
Machinery and equipment
 
$
18,747
 
$
19,807
 
Furniture and fixtures
 
 
9,605
 
 
8,025
 
Leasehold improvements
 
 
9,564
 
 
9,179
 
 
 
 
37,916
 
 
37,011
 
Less: accumulated depreciation
 
 
25,802
 
 
25,221
 
 
 
$
12,114
 
$
11,790