Derivatives - Activity in Accumulated Other Comprehensive Items (OCI) (Details) $ in Thousands	9 Months Ended
Sep. 28, 2019 USD ($)
Total Stockholders' Equity [Roll Forward]
Beginning balance	$ 374,571
(Gain) loss reclassified to earnings (a)	113
Loss recognized in AOCI	(8,097)
Ending balance	406,873
Net unrealized losses included in AOCI expected to be reclassified to earnings over the next 12 months	195
Cash Flow Hedges
Total Stockholders' Equity [Roll Forward]
Beginning balance	(197)
(Gain) loss reclassified to earnings (a)	77
Loss recognized in AOCI	(601)
Ending balance	(721)
Cash Flow Hedges \| Interest Rate Swap Agreements
Total Stockholders' Equity [Roll Forward]
Beginning balance	(170)
(Gain) loss reclassified to earnings (a)	(12)
Loss recognized in AOCI	(478)
Ending balance	(660)
Cash Flow Hedges \| Forward currency-exchange contract
Total Stockholders' Equity [Roll Forward]
Beginning balance	(27)
(Gain) loss reclassified to earnings (a)	89
Loss recognized in AOCI	(123)
Ending balance	$ (61)

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount after tax, before 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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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 of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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