Derivatives - Activity in Accumulated Other Comprehensive Items (OCI) (Details) $ in Thousands	3 Months Ended
Mar. 28, 2020 USD ($)
Total Stockholders' Equity [Roll Forward]
Beginning balance	$ 427,079
Ending balance	424,272
Cash Flow Hedges
Total Stockholders' Equity [Roll Forward]
Beginning balance	(644)
Loss reclassified to earnings	43
(Loss) gain recognized in AOCI	(345)
Ending balance	(946)
Cash Flow Hedges \| Interest Rate Swap Agreements
Total Stockholders' Equity [Roll Forward]
Beginning balance	(589)
Loss reclassified to earnings	26
(Loss) gain recognized in AOCI	(403)
Ending balance	(966)
Cash Flow Hedges \| Forward currency-exchange contracts
Total Stockholders' Equity [Roll Forward]
Beginning balance	(55)
Loss reclassified to earnings	17
(Loss) gain recognized in AOCI	58
Ending balance	$ 20

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

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