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Inventories
3 Months Ended
Mar. 31, 2015
Inventories [Abstract]  
Inventories
5. Inventories

Inventories consist of the following:

  
March 31,
  
December 31,
 
(in thousands)
 
2015
  
2014
 
Raw materials and supplies
 
$
17,016
  
$
17,375
 
Work-in-process
  
40,812
   
33,477
 
Finished goods
  
24,306
   
14,822
 
Total inventories
 
$
82,134
  
$
65,674