Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 30, 2013	Dec. 31, 2012
Assets:
Held-to-maturity Securities, Transferred Security, at Carrying Value
Held-to-maturity Securities, Unrecognized Holding Gain	0
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities	0
Assets held in rabbi trusts	34,617	33,751
Available for sale securities	7,237	7,580
Fair Value Assets	41,854	41,331
Held-to-maturity Securities, Unrecognized Holding Loss	0
Liabilities:
Embedded derivative	(995)	(1,303)
Fair Value Liabilities	(995)	(1,303)
Long-term Debt, Fair Value	810,100	686,800
Carrying value of long-term debt, excluding derivative liabilities	393,514	391,628
Fair Value, Inputs, Level 1 [Member]
Assets:
Assets held in rabbi trusts	22,406	21,954
Available for sale securities	7,237	7,580
Fair Value Assets	29,643	29,534
Liabilities:
Fair Value Liabilities	0	0
Fair Value, Inputs, Level 2 [Member]
Assets:
Assets held in rabbi trusts	12,211	11,797
Available for sale securities	0	0
Fair Value Assets	12,211	11,797
Liabilities:
Fair Value Liabilities	0	0
Fair Value, Inputs, Level 3 [Member]
Assets:
Assets held in rabbi trusts	0	0
Available for sale securities	0	0
Fair Value Assets	0	0
Liabilities:
Fair Value Liabilities	(995)	(1,303)
Convertible Senior Debentures 2040 [Member]
Liabilities:
Embedded derivative	(475)	(622)
Convertible Senior Debentures 2040 [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures 2040 [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures 2040 [Member] \| Fair Value, Inputs, Level 3 [Member]
Liabilities:
Embedded derivative	(475)	(622)
Convertible Senior Debentures 2041 [Member]
Liabilities:
Embedded derivative	(311)	(399)
Convertible Senior Debentures 2041 [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures 2041 [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures 2041 [Member] \| Fair Value, Inputs, Level 3 [Member]
Liabilities:
Embedded derivative	(311)	(399)
Convertible Senior Debentures 2042 [Member]
Liabilities:
Embedded derivative	(209)	(282)
Convertible Senior Debentures 2042 [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures 2042 [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures 2042 [Member] \| Fair Value, Inputs, Level 3 [Member]
Liabilities:
Embedded derivative	$ (209)	$ (282)

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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For any transfer of securities categorized as held-to-maturity, this item represents the net carrying amount of the transferred security to another category of investments in debt and equity securities (trading or available-for-sale).

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Fair value of the net of financial assets at the reporting date.

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