Derivatives and Fair Value of Financial Instruments (Details 4) - USD ($)	Jul. 04, 2015	Dec. 31, 2014
Commodities
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Margin account	$ 10,168,000	$ 4,314,000
Commodities | Other current assets
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Asset Derivatives	20,737,000	6,136,000
Derivative assets and liabilities, net basis	19,852,000	9,267,000
Commodities | Other current liabilities
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Liability Derivatives	11,530,000	1,779,000
Derivative assets and liabilities, net basis	477,000	596,000
Foreign currencies | Other current assets
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Asset Derivatives	2,285,000	1,675,000
Foreign currencies | Other current liabilities
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Liability Derivatives	1,606,000	407,000
Interest rate swaps | Other current assets
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Asset Derivatives	1,368,000
Interest rate swaps | Other current liabilities
Fair value of each type of derivative and its location in the Consolidated Balance Sheets
Liability Derivatives	$ 5,348,000	$ 7,715,000