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5. DERIVATIVES (Tables)
6 Months Ended
Jun. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivatives not designated as hedging instruments

    Realized Gains 
      Three Months Ended June 30, 
Type of Instrument  Statements of Operations Location  2015   2014 
Commodity contracts  Cost of goods sold  $264   $465 
      $264   $465 

 

    Unrealized Losses 
      Three Months Ended June 30, 
Type of Instrument  Statements of Operations Location  2015   2014 
Commodity contracts  Cost of goods sold  $(552)  $(17)
      $(552)  $(17)

 

    Realized Gains 
      Six Months Ended June 30, 
Type of Instrument  Statements of Operations Location  2015   2014 
Commodity contracts  Cost of goods sold  $149   $549 
      $149   $549 

 

    Unrealized Losses 
      Six Months Ended June 30, 
Type of Instrument  Statements of Operations Location  2015   2014 
Commodity contracts  Cost of goods sold  $(626)  $(32)
      $(626)  $(32)