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8. DERIVATIVES (Tables)
 12 Months Ended
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivatives not designated as hedging instruments

   As of December 31, 2015 
   Assets   Liabilities 
Type of Instrument  Balance Sheet Location   Fair Value   Balance Sheet Location   Fair Value 
Commodity contracts  Other current assets  $2,081   Other current liabilities  $1,848 
      $2,081      $ 1,848 

 

  As of December 31, 2015 
   Assets   Liabilities 
Type of Instrument  Balance Sheet Location   Fair Value   Balance Sheet Location   Fair Value 
Commodity contracts  Other current assets  $1,586   Other current liabilities  $1,149 
      $1,586       $1,149 

 
Recognized gains (losses) on Derivatives

 

       Realized Losses 
       For the Years Ended December 31, 
Type of Instrument  Statements of Operations Location   2015    2014    2013 
Commodity contracts  Cost of goods sold  $(338)  $(1,144)  $(1,901)
      $(338)  $(1,144)  $(1,901)

 

       Unrealized (Losses) Gains 
       For the Years Ended December 31, 
Type of Instrument  Statements of Operations Location   2015    2014    2013 
Commodity contracts  Cost of goods sold  $(204)  $336   $80 
      $(204)  $336   $80