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Inventories
 3 Months Ended
Mar. 31, 2016
Inventory Disclosure [Abstract]  
Inventories
3. Inventories

At March 31, 2016 and December 31, 2015, approximately 51% and 60% respectively, of the inventories were valued on the LIFO method with the remaining inventories valued on the FIFO method. Inventories were comprised of the following:

 

     March 31,
2016		      December 31,
2015		  

Raw materials

    $ 22,744       $ 18,314   

Work-in-process

      34,230         21,583   

Finished goods

      25,016         9,897   

Supplies

      11,988         9,940   
  

 

 

     

 

 

  
   $ 93,978       $ 59,734