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Derivatives and Fair Value of Financial Instruments (Details 5) (USD $)
9 Months Ended
Sep. 29, 2012
item
Dec. 31, 2011
Commodities
   
Fair value of each type of derivative and its location in the Condensed Consolidated Balance Sheets    
Asset Derivatives $ 11,735,000 $ 5,144,000
Liability Derivatives 14,536,000 5,529,000
Margin account 16,432,000 8,619,000
Derivative assets and liabilities, net basis 13,631,000 8,234,000
Foreign currencies
   
Fair value of each type of derivative and its location in the Condensed Consolidated Balance Sheets    
Asset Derivatives 526,000 2,247,000
Liability Derivatives 1,414,000 3,380,000
Loss due to credit risk associated with derivative contracts 526,000  
Number of counterparties 4  
Interest rate
   
Fair value of each type of derivative and its location in the Condensed Consolidated Balance Sheets    
Liability Derivatives $ 10,340,000 $ 11,268,000