Fair Value Measurements (Details) (USD $) In Thousands	Jul. 02, 2011	Dec. 31, 2010
Assets held in rabbi trusts	$ 28,974	$ 25,585
Available for sale securities	6,212	5,736
Fair Value Assets	35,168	31,321
Liabilities:
Embedded derivative	(540)	(319)
Convertible Senior Debentures Due In 2041 \| Fair Value, Inputs, Level 1 [Member]
Liabilities:
Embedded derivative	0
Convertible Senior Debentures Due In 2041 \| Fair Value, Inputs, Level 2 [Member]
Liabilities:
Embedded derivative	0
Convertible Senior Debentures Due In 2041 \| Fair Value, Inputs, Level 3 [Member]
Liabilities:
Embedded derivative	(213)
Convertible Senior Debentures [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures [Member] \| Fair Value, Inputs, Level 3 [Member]
Liabilities:
Embedded derivative	(327)	(319)
Fair Value, Inputs, Level 1 [Member]
Assets held in rabbi trusts	17,242	15,575
Available for sale securities	6,212	5,736
Fair Value Assets	23,454	21,311
Liabilities:
Embedded derivative	0	0
Fair Value, Inputs, Level 2 [Member]
Assets held in rabbi trusts	11,732	10,010
Available for sale securities	0	0
Fair Value Assets	11,732	10,010
Liabilities:
Embedded derivative	0	0
Fair Value, Inputs, Level 3 [Member]
Assets held in rabbi trusts	0	0
Available for sale securities	0	0
Fair Value Assets	0	0
Liabilities:
Embedded derivative	$ (540)	$ (319)

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 value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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