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Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Components) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 500,603
Other comprehensive income (loss) before reclassifications	11	$ (3,358)
Tax (expense) or benefit	166	1,018
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax	190	262
Ending balance	493,991
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(5,000)	(5,186)
Ending balance	(4,633)	(7,264)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,188)	322
Other comprehensive income (loss) before reclassifications	459	(598)
Tax (expense) or benefit	0	0
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax	0	0
Ending balance	(729)	(276)
Unrealized Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(105)	(2)
Other comprehensive income (loss) before reclassifications	57	112
Tax (expense) or benefit	(20)	(39)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax	0	0
Ending balance	(68)	71
Pension and Post-retirement Liabilities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(5,167)	(5,506)
Other comprehensive income (loss) before reclassifications	0	0
Tax (expense) or benefit	0	0
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax	0	0
Ending balance	(5,167)	(5,506)
Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	1,460	0
Other comprehensive income (loss) before reclassifications	(505)	(2,872)
Tax (expense) or benefit	186	1,057
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax	190	262
Ending balance	$ 1,331	$ (1,553)

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 20
-Section 45
-Paragraph 11
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e39076-109324

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580

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-URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(30))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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