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INVENTORIES
3 Months Ended
Mar. 31, 2012
Inventory Disclosure [Abstract]  
INVENTORIES
8.
INVENTORIES
 
Inventories consist of the following:
 
(in thousands)
 
March 31,
2012
   
December 31, 2011
 
Raw materials and supplies
  $ 16,905     $ 15,892  
Work in process
    5,614       5,691  
Finished goods
    3,270       3,324  
Total inventories
  $ 25,789     $ 24,907