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Fair Value and Derivative Instruments - Foreign Currency Forward Contracts (Details) - 3 months ended Mar. 28, 2020 $ in Thousands, $ in Thousands	USD ($)	TWD ($)
Derivative [Line Items]
Amount expected to be reclassified	$ 200
Foreign exchange forward contracts
Derivative [Line Items]
Derivative, notional amount	6,858
Buy | Euro Dollar | Foreign exchange forward contracts
Derivative [Line Items]
Derivative, notional amount	3,557	$ 3,061
Sell | Japanese Yen | Foreign exchange forward contracts
Derivative [Line Items]
Derivative, notional amount	12,503	1,346,506
Sell | Korean Won | Foreign exchange forward contracts
Derivative [Line Items]
Derivative, notional amount	$ 2,088	$ 2,526,325

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- Definition

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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