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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)

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition The amount by which the fair value of an investment in debt securities categorized as Held-to-maturity is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 16B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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