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Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property, plant and equipment, net consisted of the following (in thousands):
 
 
 
June 30,
 
December 30,
 
 
 
2017
 
2016
 
Machinery and equipment
 
$
18,881
 
$
19,807
 
Furniture and fixtures
 
 
9,676
 
 
8,025
 
Leasehold improvements
 
 
9,611
 
 
9,179
 
 
 
 
38,168
 
 
37,011
 
Less: accumulated depreciation
 
 
26,549
 
 
25,221
 
 
 
$
11,619
 
$
11,790