Accumulated Other Comprehensive Items - Reclassification Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Selling, general, and administrative expenses	$ (39,159)	$ (36,072)	$ (73,958)	$ (68,568)
Interest expense	(392)	(340)	(740)	(609)
Cost of revenues	(57,418)	(61,567)	(111,283)	(114,129)
Amortization of Actuarial Losses [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Loss from Continuing Operations			(181)	(265)
Amortization of Prior Service Cost [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Loss from Continuing Operations			(47)	(48)
Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Loss from Continuing Operations			(18)	(277)
Reclassification out of Accumulated Other Comprehensive Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Loss from Continuing Operations	(120)	(283)	(246)	(590)
Reclassification out of Accumulated Other Comprehensive Items [Member] \| Pension and Other Post-retirement Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Total expense before income taxes	(181)	(182)	(351)	(480)
Income tax benefit (provision)	64	63	123	167
Loss from Continuing Operations	(117)	(119)	(228)	(313)
Reclassification out of Accumulated Other Comprehensive Items [Member] \| Amortization of Actuarial Losses [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Selling, general, and administrative expenses	(144)	(146)	(279)	(406)
Reclassification out of Accumulated Other Comprehensive Items [Member] \| Amortization of Prior Service Cost [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Selling, general, and administrative expenses	(37)	(36)	(72)	(74)
Reclassification out of Accumulated Other Comprehensive Items [Member] \| Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Total expense before income taxes	(6)	(56)	(29)	(229)
Income tax benefit (provision)	3	(108)	11	(48)
Loss from Continuing Operations	(3)	(164)	(18)	(277)
Reclassification out of Accumulated Other Comprehensive Items [Member] \| Cash Flow Hedges [Member] \| Interest Rate Swap [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Interest expense	(6)	(47)	(18)	(136)
Reclassification out of Accumulated Other Comprehensive Items [Member] \| Cash Flow Hedges [Member] \| Forward Currency-Exchange Contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Revenues	0	37	0	(24)
Cost of revenues	$ 0	$ (46)	$ (11)	$ (69)

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Amount of the cost of borrowed funds accounted for as interest expense.

+ References

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-Publisher FASB
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-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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

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

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

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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