Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 29, 2015	Mar. 30, 2014	Dec. 28, 2014
Fair Value of Financial Instruments (Thousands of Dollars) [Abstract]
Fair Value of Available for Sale Investments, Fair Value Option	$ 23,141	$ 37,201	$ 23,560
Net Gain (Loss) on Available-for-Sale Investments, Fair Value Option	17	1,177
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, assets	27,977us-gaap_AvailableForSaleSecurities	40,984us-gaap_AvailableForSaleSecurities	28,042us-gaap_AvailableForSaleSecurities
Derivatives, assets	130,550us-gaap_DerivativeAssets	1,311us-gaap_DerivativeAssets	69,148us-gaap_DerivativeAssets
Total assets, fair value hierarchy	158,527us-gaap_AssetsFairValueDisclosure	42,295us-gaap_AssetsFairValueDisclosure	97,190us-gaap_AssetsFairValueDisclosure
Derivatives, liabilities	3,513us-gaap_DerivativeLiabilities	33,053us-gaap_DerivativeLiabilities	2,591us-gaap_DerivativeLiabilities
Option Agreement	24,920		25,340
Total Liabilities	28,433	33,053	27,931
Reconciliation of fair value for Level 3 financial instruments
Balance at beginning of year	(19,553)	5,484
Gain (loss) from change in fair value	568	179
Balance at end of period	(18,985)	5,663
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, assets	4,836	3,783	4,482
Derivatives, assets	0	0	0
Total assets, fair value hierarchy	4,836	3,783	4,482
Derivatives, liabilities	0	0	0
Option Agreement	0		0
Total Liabilities	0	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, assets	17,206	31,538	17,773
Derivatives, assets	130,550	1,311	69,148
Total assets, fair value hierarchy	147,756	32,849	86,921
Derivatives, liabilities	3,513	33,053	2,591
Option Agreement	0		0
Total Liabilities	3,513	33,053	2,591
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, assets	5,935	5,663	5,787
Derivatives, assets	0	0	0
Total assets, fair value hierarchy	5,935	5,663	5,787
Derivatives, liabilities	0	0	0
Option Agreement	24,920		25,340
Total Liabilities	$ 24,920	$ 0	$ 25,340

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

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Fair market value of joint venture option agreement included in other liabilities.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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