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Derivatives - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 30, 2017
--- | --- | ---
Designated as Hedging Instrument [Member] | Swap Agreement 2015 [Member] | Other Long-Term Assets [Member] |  |
Derivatives in an Asset Position: |  |
Derivatives in an asset position | $ 209 | $ 126
Notional amount, Derivative asset | 10,000 | 10,000
Designated as Hedging Instrument [Member] | Swap Agreement 2018 [Member] | Other Long-Term Liabilities [Member] |  |
Derivatives in an Asset Position: |  |
Derivatives in an asset position | (210) | 0
Notional amount, Derivative asset | 15,000 | 0
Not Designated as Hedging Instrument [Member] | Forward currency-exchange contracts [Member] | Other Current Assets [Member] |  |
Derivatives in an Asset Position: |  |
Derivatives in an asset position | 0 | 17
Notional amount, Derivative asset | 0 | 1,244
Not Designated as Hedging Instrument [Member] | Forward currency-exchange contracts [Member] | Other Current Liabilities [Member] |  |
Derivatives in a Liability Position: |  |
Derivatives in a liability position | (52) | (16)
Notional amount, Derivative liability | $ 2,712 | $ 2,049

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