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Inventories
 6 Months Ended
Jun. 30, 2017
Inventories [Abstract]  
Inventories
6.
Inventories

The components of inventory were as follows (in thousands):

 
 
June 30,
  
December 31,
 
  
2017
  
2016
 
Raw materials and supplies
 
$
121,524
  
$
113,632
 
Work in process
  
26,990
   
24,290
 
Finished products
  
89,911
   
81,263
 
Inventory reserves
  
(38,583
)
  
(37,233
)
 
 
$
199,842
  
$
181,952