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Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2018	Dec. 31, 2017
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	(354)	$ (538)
Long-term Debt, Fair Value	989,400	1,071,200
Carrying value of long-term debt, excluding derivative liabilities	605,948	379,033
Derivative, Notional Amount	0	100,000
Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	43,701	45,252
Available for sale securities	4,429	4,621
Fair Value Assets	48,130	49,873
Liabilities:
Fair Value Liabilities	(354)	(538)
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	26,363	28,589
Available for sale securities	4,429	4,621
Fair Value Assets	30,792	33,210
Liabilities:
Fair Value Liabilities	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	17,338	16,663
Available for sale securities	0	0
Fair Value Assets	17,338	16,663
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	(354)	(538)
Convertible Senior Debentures, Due 2040 [Member]
Liabilities:
Embedded derivative	(47)	(206)
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	(47)	(206)
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	(47)	(206)
Convertible Senior Debentures, Due 2041 [Member]
Liabilities:
Embedded derivative	(244)	(214)
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	(244)	(214)
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	(244)	(214)
Convertible Senior Debentures, Due 2042 [Member]
Liabilities:
Embedded derivative	(63)	(118)
Convertible Senior Debentures, Due 2042 [Member] | Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	(63)	(118)
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	$ (63)	$ (118)

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Section 13
-Sentence Column B

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Amount of unrecognized gain before loss on investments in held-to-maturity securities.

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Fair value of financial and nonfinancial obligations.

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