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Inventories (Tables)
3 Months Ended
Mar. 31, 2015
Inventory Disclosure [Abstract]  
Components of Inventories

Inventories are stated at the lower of cost or market and consist of the following (in thousands):

 

     March 31,
2015
     December 31,
2014
 

Short-term inventories:

     

Raw materials

   $ 36,715       $ 48,005   

Work-in-process

     1,474         1,741   

Finished goods

     20,746         20,663   

Supplies

     2,348         2,370   
  

 

 

    

 

 

 
  61,283      72,779   

Long-term inventories:

Finished goods

  1,209      1,214   
  

 

 

    

 

 

 

Total inventories

$ 62,492    $ 73,993