v2.4.0.6
COMMITMENTS AND CONTINGENCIES (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Letters of Credit      
Outstanding letters of credit $ 11,500,000 $ 15,800,000  
Purchase Commitments      
Amount of prepaid long-term purchase commitments capitalized 19,406,000 31,154,000  
Aggregate amount of payments made under long-term raw material purchase agreements 110,900,000 187,100,000 156,800,000
Amount of raw material purchases 372,000,000    
Account payable for raw material purchases 28,200,000    
Minimum
      
Letters of Credit      
Terms of letters of credit 1 month    
Maximum
      
Letters of Credit      
Terms of letters of credit 1 year    
Aberdeen, MS
      
Legal Proceedings      
Remaining cost of completing capital projects 1,100,000    
Lake Charles, LA facility
      
Environmental Regulation      
Estimated number of PRPs in environmental regulation matter 200    
Maximum annual costs for environmental remediation projects or related activities 150,000    
Maximum aggregate payout, including annual expenditures, for environmental remediation for acquired property. 2,300,000    
Excess remediation costs incurred 2,100,000    
Accrual of remediation costs $ 3,000,000