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Fair Value Measurements (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 28, 2019 | Dec. 31, 2018
Assets [Abstract] |  |
Held-to-maturity Securities, Transferred Security, at Carrying Value | $ 0 |
Held-to-maturity Securities, Unrecognized Holding Gain | 0 |
Held-to-maturity Securities, Unrecognized Holding Loss | 0 |
Liabilities [Abstract] |  |
Long-term debt, fair value | 592,300 | $ 577,200
Carrying value of long-term debt, excluding derivative liabilities | 513,902 | 509,407
Fair Value, Measurements, Recurring [Member] |  |
Assets [Abstract] |  |
Assets held in rabbi trusts | 51,065 | 41,770
Available for sale securities | 4,328 | 4,309
Fair value assets | 55,393 | 46,079
Liabilities [Abstract] |  |
Fair value liabilities | (10) | (70)
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets [Abstract] |  |
Assets held in rabbi trusts | 34,217 | 26,278
Available for sale securities | 4,328 | 4,309
Fair value assets | 38,545 | 30,587
Liabilities [Abstract] |  |
Fair value liabilities | 0 | 0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets [Abstract] |  |
Assets held in rabbi trusts | 16,848 | 15,492
Available for sale securities | 0 | 0
Fair value assets | 16,848 | 15,492
Liabilities [Abstract] |  |
Fair value liabilities | 0 | 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets [Abstract] |  |
Assets held in rabbi trusts | 0 | 0
Available for sale securities | 0 | 0
Fair value assets | 0 | 0
Liabilities [Abstract] |  |
Fair value liabilities | (10) | (70)
Convertible Debentures, Due 2040 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities [Abstract] |  |
Embedded derivative | 0 | (1)
Convertible Debentures, Due 2040 [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities [Abstract] |  |
Embedded derivative | 0 | 0
Convertible Debentures, Due 2040 [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities [Abstract] |  |
Embedded derivative | 0 | 0
Convertible Debentures, Due 2040 [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities [Abstract] |  |
Embedded derivative | 0 | (1)
Convertible Debentures, Due 2041 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities [Abstract] |  |
Embedded derivative | (10) | (67)
Convertible Debentures, Due 2041 [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities [Abstract] |  |
Embedded derivative | 0 | 0
Convertible Debentures, Due 2041 [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities [Abstract] |  |
Embedded derivative | 0 | 0
Convertible Debentures, Due 2041 [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities [Abstract] |  |
Embedded derivative | $ (10) | (67)
Convertible Debentures, Due 2042 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities [Abstract] |  |
Embedded derivative |  | (2)
Convertible Debentures, Due 2042 [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities [Abstract] |  |
Embedded derivative |  | 0
Convertible Debentures, Due 2042 [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities [Abstract] |  |
Embedded derivative |  | 0
Convertible Debentures, Due 2042 [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities [Abstract] |  |
Embedded derivative |  | $ (2)

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Amount of unrealized gain (loss) from transfer of investment in debt security measured at amortized cost (held-to-maturity), to investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27405-111563 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition The fair value amount of long-term debt 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. + References No definition available. + Details
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