Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jul. 04, 2020	Jul. 04, 2020	Dec. 31, 2019
Assets [Abstract]
Held-to-maturity Securities Transferred		$ 0	$ 0
Held-to-maturity Securities, Unrecognized Holding Gain	$ 0	0	0
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities	0		0
Held-to-maturity Securities, Unrecognized Holding Loss	0	0	0
Liabilities [Abstract]
Long-term debt, fair value	497,600	497,600	632,200
Carrying value of long-term debt, excluding derivative liabilities	452,355	452,355	515,931
Fair Value, Measurements, Recurring [Member]
Assets [Abstract]
Assets held in rabbi trusts	53,888	53,888	52,148
Available for sale securities	4,401	4,401	4,405
Fair value assets	58,289	58,289	56,553
Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets [Abstract]
Assets held in rabbi trusts	36,822	36,822	34,280
Available for sale securities	4,401	4,401	4,405
Fair value assets	41,223	41,223	38,685
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets [Abstract]
Assets held in rabbi trusts	17,066	17,066	17,868
Available for sale securities	0	0	0
Fair value assets	17,066	17,066	17,868
Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets [Abstract]
Assets held in rabbi trusts	0	0	0
Available for sale securities	0	0	0
Fair value assets	$ 0	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of investment in debt security, measured at amortized cost, transferred to investment in debt security, measured at fair value, with change in fair value recognized in other comprehensive income (available-for-sale) and net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27405-111563

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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
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563

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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
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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.

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Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at amortized cost (held-to-maturity), recognized in earnings and other comprehensive income (OCI).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
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The carrying value of long-term debt, excluding the derivative liability.

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Fair value as of the balance sheet date of assets held in rabbi trusts to fund payments under deferred compensation and non-qualified pension plans.

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