Derivatives and Fair Value of Financial Instruments (Details 5) (USD $)					6 Months Ended
	Jun. 29, 2013 Commodities	Dec. 31, 2012 Commodities	Jun. 29, 2013 Commodities Other current assets	Dec. 31, 2012 Commodities Other current assets	Jun. 29, 2013 Foreign currencies item	Jun. 29, 2013 Foreign currencies Other current assets	Jun. 29, 2013 Foreign currencies Other current liabilities	Dec. 31, 2012 Foreign currencies Other current liabilities	Jun. 29, 2013 Interest rate Other current liabilities	Dec. 31, 2012 Interest rate Other current liabilities
Fair value of each type of derivative and its location in the Condensed Consolidated Balance Sheets
Asset Derivatives			$ 6,581,000	$ 6,916,000		$ 4,309,000
Liability Derivatives			13,636,000	7,112,000			184,000	4,157,000	5,297,000	9,810,000
Margin account	22,188,000	14,063,000
Derivative assets and liabilities, net basis			15,133,000	13,867,000
Loss due to credit risk associated with derivative contracts					$ 4,309,000
Number of counterparties					6