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Inventories
12 Months Ended
Dec. 31, 2011
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consist of the following (in thousands):
 
 
At
 
December 31,
2011
 
January 1,
2011
Raw materials and sub-assemblies
$
24,963

 
$
22,352

Work in process
11,143

 
10,295

Consignment inventory
10,547

 
8,263

Finished goods
5,607

 
2,258

Total inventories
$
52,260

 
$
43,168