Derivatives and Fair Value of Financial Instruments (Details 5) (USD $)	Jun. 28, 2014	Dec. 31, 2013
Commodities
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Margin account	$ 44,039,000	$ 29,822,000
Commodities | Other current assets
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Asset Derivatives	9,560,000	2,331,000
Derivative assets and liabilities, net basis	15,585,000	16,731,000
Commodities | Other current liabilities
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Liability Derivatives	38,166,000	16,014,000
Derivative assets and liabilities, net basis	152,000	592,000
Foreign currencies | Other current assets
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Asset Derivatives	2,101,000	2,763,000
Foreign currencies | Other current liabilities
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Liability Derivatives	378,000	101,000
Interest rate swaps | Other current liabilities
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Liability Derivatives	$ 6,901,000	$ 4,103,000