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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 28, 2013 | Dec. 31, 2012
Assets: |  |
Held-to-maturity Securities, Transferred Security, at Carrying Value | $ 0 |
Held-to-maturity Securities, Unrecognized Holding Gain | 0 |
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities | 0 |
Assets held in rabbi trusts | 35,889 | 33,751
Available for sale securities | 7,212 | 7,580
Fair Value Assets | 43,101 | 41,331
Liabilities: |  |
Embedded derivative | (937) | (1,303)
Fair Value Liabilities | (937) | (1,303)
Long-term Debt, Fair Value | 739,900 | 686,800
Carrying value of long-term debt, excluding derivative liabilities | 358,937 | 391,628
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Assets held in rabbi trusts | 23,370 | 21,954
Available for sale securities | 7,212 | 7,580
Fair Value Assets | 30,582 | 29,534
Liabilities: |  |
Fair Value Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Assets held in rabbi trusts | 12,519 | 11,797
Available for sale securities | 0 | 0
Fair Value Assets | 12,519 | 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 | (937) | (1,303)
Convertible Senior Debentures 2040 [Member] |  |
Liabilities: |  |
Embedded derivative | (429) | (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 | (429) | (622)
Convertible Senior Debentures 2041 [Member] |  |
Liabilities: |  |
Embedded derivative | (299) | (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 | (299) | (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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