Fair Value of Financial Instruments (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 25, 2011	Sep. 26, 2010	Sep. 25, 2011	Sep. 26, 2010	Dec. 26, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 20,119	$ 21,395	$ 20,119	$ 21,395	$ 21,791
Derivatives	28,084	28,547	28,084	28,547	38,092
Total	48,203	49,942	48,203	49,942	59,883
Reconciliation of fair value measurements of the Company's warrants
Balance at beginning of year			9,155	6,808
Loss from change in fair value			(6,275)	(827)
Balance at end of period	2,880	5,981	2,880	5,981
Available for Sale Investments, Fair Value Option	20,095	21,354	20,095	21,354	21,767
(Loss) gain on Available for Sale Investments, Fair Value Option	(24)	416	499	799
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	24	41	24	41	24
Derivatives	0	0	0	0	0
Total	24	41	24	41	24
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	20,095	21,354	20,095	21,354	21,767
Derivatives	25,204	22,566	25,204	22,566	28,937
Total	45,299	43,920	45,299	43,920	50,704
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0	0	0	0
Derivatives	2,880	5,981	2,880	5,981	9,155
Total	$ 2,880	$ 5,981	$ 2,880	$ 5,981	$ 9,155

Available for sale investments for which the fair value option was elected.

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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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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This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

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This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

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