FAIR VALUE MEASUREMENTS (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 24, 2012	Dec. 25, 2011
Commodity derivative assets	$ 7,471	$ 2,870
Commodity derivative liabilities	(1,353)	(2,723)
Options Held [Member]
Commodity derivative assets	2,348
Future [Member]
Commodity derivative assets	5,123	2,870
Commodity derivative liabilities	(1,353)	(2,120)
Short-Term Investments [Member]
Investments in available-for-sale securities, fair value	156	157
Long Term Investments [Member]
Investments in available-for-sale securities, fair value	474	497
Fair Value, Inputs, Level 1 [Member] \| Options Held [Member]
Commodity derivative assets	0
Fair Value, Inputs, Level 1 [Member] \| Future [Member]
Commodity derivative assets	5,123
Commodity derivative liabilities	(1,353)
Fair Value, Inputs, Level 1 [Member] \| Short-Term Investments [Member]
Investments in available-for-sale securities, fair value	0
Fair Value, Inputs, Level 1 [Member] \| Long Term Investments [Member]
Investments in available-for-sale securities, fair value	0
Fair Value, Inputs, Level 2 [Member] \| Options Held [Member]
Commodity derivative assets	2,348
Fair Value, Inputs, Level 2 [Member] \| Future [Member]
Commodity derivative assets	0
Commodity derivative liabilities	0
Fair Value, Inputs, Level 2 [Member] \| Short-Term Investments [Member]
Investments in available-for-sale securities, fair value	156
Fair Value, Inputs, Level 2 [Member] \| Long Term Investments [Member]
Investments in available-for-sale securities, fair value	474
Fair Value, Inputs, Level 3 [Member] \| Options Held [Member]
Commodity derivative assets	0
Fair Value, Inputs, Level 3 [Member] \| Future [Member]
Commodity derivative assets	0
Commodity derivative liabilities	0
Fair Value, Inputs, Level 3 [Member] \| Short-Term Investments [Member]
Investments in available-for-sale securities, fair value	0
Fair Value, Inputs, Level 3 [Member] \| Long Term Investments [Member]
Investments in available-for-sale securities, fair value	$ 0

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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