Derivatives and Fair Value of Financial Instruments (Details 5) (USD $)	Mar. 29, 2014	Dec. 31, 2013
Commodities
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Margin account	$ 42,622,000	$ 29,822,000
Commodities | Other current assets
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Asset Derivatives	19,402,000	2,331,000
Derivative assets and liabilities, net basis	19,638,000	16,731,000
Commodities | Other current liabilities
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Liability Derivatives	43,271,000	16,014,000
Derivative assets and liabilities, net basis	885,000	592,000
Foreign currencies | Other current assets
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Asset Derivatives	59,000	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	2,043,000	101,000
Interest rate | Other current assets
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Asset Derivatives	388,000
Interest rate | Other current liabilities
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Liability Derivatives	$ 4,551,000	$ 4,103,000