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Inventories (Tables)
 12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in thousands):
  
December 31,
 
2016
 
2015
Raw materials
$
18,224

 
$
27,301

Work-in-process
2,760

 
3,136

Finished goods
6,000

 
6,897

 
$
26,984

 
$
37,334