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Inventories (Tables)
12 Months Ended
Dec. 31, 2016
Inventories [Abstract]  
Inventories
Inventories consist of the following:

  
December 31,
 
(in thousands)
 
2016
  
2015
 
Raw materials and supplies
 
$
30,687
  
$
21,275
 
Work-in-process
  
19,821
   
32,709
 
Finished goods
  
23,494
   
6,903
 
Total inventories
 
$
74,002
  
$
60,887