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Derivative Instruments & Hedging Activities (Details Textual) € in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 28, 2019 USD ($) Contract | Sep. 29, 2018 USD ($) | Sep. 28, 2019 USD ($) Contract | Sep. 29, 2018 USD ($) | Sep. 28, 2019 EUR (€) Contract | Dec. 29, 2018 USD ($) | Mar. 31, 2018 EUR (€)
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Interest expense | $ 3,790,000 | $ 4,622,000 | $ 12,223,000 | $ 9,256,000 |  |  |
Purchase amount of forward foreign exchange currency contract | € |  |  |  |  |  |  | € 370,000
Carrying value of total long term non-revolving debt | 93,723,000 |  | 93,723,000 |  |  | $ 97,983,000 |
Gain loss on derivative hedge recorded in AOCI as a part of currency translation adjustment |  |  | 1,882,000 |  |  |  |
Net investment hedge reclassified from AOCI into income |  |  | 0 |  |  |  |
Europe [Member] |  |  |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Carrying value of total long term non-revolving debt | $ 87,489,000 |  | $ 87,489,000 |  |  |  |
Revolving Credit Facility [Member] | Europe [Member] |  |  |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Net investment hedge | € |  |  |  |  | € 80,000 |  |
Forward Foreign Exchange Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Derivative instrument, notional amount | € |  |  |  |  | € 64,526 |  |
Derivative contract expire date |  |  | Apr. 01, 2021 |  |  |  |
Derivative, number of instruments held | Contract | 7 |  | 7 |  | 7 |  |
Cash Flow Hedging [Member] |  |  |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Interest expense |  |  | $ 12,223,000 |  |  |  |
Cash Flow Hedging [Member] | Interest Rate Swap Contract [Member] | Derivatives Designated as Hedging Instruments [Member] |  |  |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Derivative instrument, notional amount | $ 175,000,000 |  | 175,000,000 |  |  |  |
Annual decrease in derivative notional amount |  |  | $ 25,000,000 |  |  |  |
Derivative contract effective date |  |  | Aug. 02, 2018 |  |  |  |
Derivative contract expire date |  |  | Apr. 03, 2023 |  |  |  |

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