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Inventories (Tables)
9 Months Ended
Sep. 30, 2014
Inventory Disclosure [Abstract]  
Components of Inventories

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

 

     September 30,
2014
     December 31,
2013
 

Short-term inventories:

     

Raw materials

   $ 53,472       $ 52,598   

Work-in-process

     2,057         4,902   

Finished goods

     19,406         49,351   

Supplies

     2,337         3,541   
  

 

 

    

 

 

 
     77,272         110,392   

Long-term inventories:

     

Finished goods

     1,398         1,249   
  

 

 

    

 

 

 

Total inventories

   $ 78,670       $ 111,641