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Derivatives and Fair Value of Financial Instruments (Details 5) (USD $)
3 Months Ended
Mar. 30, 2013
item
Dec. 31, 2012
Commodities
   
Fair value of each type of derivative and its location in the Condensed Consolidated Balance Sheets    
Asset Derivatives $ 4,253,000 $ 6,916,000
Liability Derivatives 9,989,000 7,112,000
Margin account 15,222,000 14,063,000
Derivative assets and liabilities, net basis 9,486,000 13,867,000
Foreign currencies
   
Fair value of each type of derivative and its location in the Condensed Consolidated Balance Sheets    
Asset Derivatives 5,766,000  
Liability Derivatives   4,157,000
Loss due to credit risk associated with derivative contracts 5,766,000  
Number of counterparties 9  
Interest rate
   
Fair value of each type of derivative and its location in the Condensed Consolidated Balance Sheets    
Liability Derivatives $ 8,803,000 $ 9,810,000