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Fair Value Measurements (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 01, 2017 | Dec. 31, 2016
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 | (827) | $ (854)
Long-term Debt, Fair Value | 899,000 | 860,600
Carrying value of long-term debt, excluding derivative liabilities | 388,260 | 367,049
Derivative, Notional Amount | 105,400 | 100,000
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Assets held in rabbi trusts | 42,345 | 41,917
Available for sale securities | 4,048 | 3,969
Fair Value Assets | 46,393 | 45,886
Liabilities: |  |
Fair Value Liabilities | (827) | (854)
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Assets held in rabbi trusts | 27,178 | 27,297
Available for sale securities | 4,048 | 3,969
Fair Value Assets | 31,226 | 31,266
Liabilities: |  |
Fair Value Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Assets held in rabbi trusts | 15,167 | 14,620
Available for sale securities | 0 | 0
Fair Value Assets | 15,167 | 14,620
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 | (827) | (854)
Convertible Senior Debentures, Due 2040 [Member] |  |
Liabilities: |  |
Embedded derivative | (368) | (393)
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | (368) | (393)
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 | (368) | (393)
Convertible Senior Debentures, Due 2041 [Member] |  |
Liabilities: |  |
Embedded derivative | (287) | (285)
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | (287) | (285)
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 | (287) | (285)
Convertible Senior Debentures, Due 2042 [Member] |  |
Liabilities: |  |
Embedded derivative | (172) | (176)
Convertible Senior Debentures, Due 2042 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | (172) | (176)
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 | $ (172) | $ (176)

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