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Inventories (Tables)
 9 Months Ended
Sep. 30, 2016
Inventories [Abstract]  
Inventories
The components of inventory were as follows (in thousands):
 
 
 
September 30,
2016
  
December 31,
2015
 
Raw materials and supplies
 
$
119,287
  
$
120,811
 
Work in process
  
29,440
   
22,979
 
Finished products
  
85,336
   
80,118
 
Inventory reserves
  
(36,534
)
  
(34,040
)
 
 
$
197,529
  
$
189,868