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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventories [Abstract]  
Inventories
Inventories consist of the following:

  
December 31,
 
(in thousands)
 
2017
  
2016
 
Raw materials and supplies
 
$
36,069
  
$
30,687
 
Work-in-process
  
76,610
   
19,821
 
Finished goods
  
30,133
   
23,494
 
Total inventories
 
$
142,812
  
$
74,002
 

The increase in inventories for the year ended December 31, 2017 was primarily due to the acquisition of ACAM2000 in October 2017.