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FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 30, 2012
--- | --- | ---
Derivative assets - commodity futures instruments | $ 5,077 | $ 1,821
Deferred compensation plan assets | 7,850 | 7,591
Derivative liabilities - commodity futures instruments | (2,778) | (1,530)
Future [Member] |  |
Derivative assets - commodity futures instruments | 5,077 | 1,821
Derivative liabilities - commodity futures instruments | (2,778) | (1,530)
Fair Value, Inputs, Level 1 [Member] |  |
Deferred compensation plan assets | 7,850 | 7,591
Fair Value, Inputs, Level 1 [Member] | Future [Member] |  |
Derivative assets - commodity futures instruments | 5,077 | 1,821
Derivative liabilities - commodity futures instruments | (2,778) | (1,530)
Fair Value, Inputs, Level 2 [Member] |  |
Deferred compensation plan assets | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Future [Member] |  |
Derivative assets - commodity futures instruments | 0 | 0
Derivative liabilities - commodity futures instruments | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Deferred compensation plan assets | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Future [Member] |  |
Derivative assets - commodity futures instruments | 0 | 0
Derivative liabilities - commodity futures instruments | $ 0 | $ 0

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