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Fair Value Measurements (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Oct. 01, 2016 | Dec. 31, 2015
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 |
Liabilities: |  |
Embedded derivative | (928) | $ (1,316)
Long-term Debt, Fair Value | 785,400 | 756,900
Carrying value of long-term debt, excluding derivative liabilities | 371,864 | 448,080
Derivative, Notional Amount | 121,130 | 29,000
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Assets held in rabbi trusts | 42,178 | 39,849
Available for sale securities | 4,280 | 3,604
Fair Value Assets | 46,458 | 43,453
Liabilities: |  |
Fair Value Liabilities | (928) | (1,316)
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Assets held in rabbi trusts | 27,663 | 25,906
Available for sale securities | 4,280 | 3,604
Fair Value Assets | 31,943 | 29,510
Liabilities: |  |
Fair Value Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Assets held in rabbi trusts | 14,515 | 13,943
Available for sale securities | 0 | 0
Fair Value Assets | 14,515 | 13,943
Liabilities: |  |
Fair Value Liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Assets held in rabbi trusts | 0 | 0
Available for sale securities | 0 | 0
Fair Value Assets | 0 | 0
Liabilities: |  |
Fair Value Liabilities | (928) | (1,316)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets: |  |
Fair value of intangible asset | 18,800 |
Convertible Senior Debentures, Due 2040 [Member] |  |
Liabilities: |  |
Embedded derivative | (426) | (576)
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | (426) | (576)
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | 0 | 0
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | 0 | 0
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | (426) | (576)
Convertible Senior Debentures, Due 2041 [Member] |  |
Liabilities: |  |
Embedded derivative | (302) | (438)
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | (302) | (438)
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | 0 | 0
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | 0 | 0
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | (302) | (438)
Convertible Senior Debentures, Due 2042 [Member] |  |
Liabilities: |  |
Embedded derivative | (200) | (302)
Convertible Senior Debentures, Due 2042 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | (200) | (302)
Convertible Senior Debentures, Due 2042 [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | 0 | 0
Convertible Senior Debentures, Due 2042 [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | 0 | 0
Convertible Senior Debentures, Due 2042 [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | $ (200) | $ (302)

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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 + Details
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