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Commitments and Contingencies (Foreign Currency Contracts) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 29, 2018 USD ($) | Jun. 30, 2017 USD ($)
Foreign Currency Cash Flow Hedges [Abstract] |  |  |  |
Increase (decrease) in sales | $ (141) | $ 163 | $ (2) | $ 139
Increase (decrease) in cost of sales | (159) | (179) | (595) | 883
Ineffective portion of change in fair value | 0 | $ 0 | 0 | $ 0
Foreign Currency Cash Flow Hedge [Line Items] |  |  |  |
Foreign currency cash flow hedge gain (loss) to be reclassified | 700 |  | 700 |
FX Contract 1 [Member] |  |  |  |
Foreign Currency Cash Flow Hedge [Line Items] |  |  |  |
Aggregate Notional Amount | 3,000 |  | $ 3,000 |
Start Date |  |  | Jul. 02, 2018 |
End Date |  |  | Dec. 28, 2018 |
FX Contract 2 [Member] |  |  |  |
Foreign Currency Cash Flow Hedge [Line Items] |  |  |  |
Aggregate Notional Amount | 15,199 |  | $ 15,199 |
Start Date |  |  | Jan. 01, 2018 |
End Date |  |  | Dec. 28, 2018 |
FX Contract 3 [Member] |  |  |  |
Foreign Currency Cash Flow Hedge [Line Items] |  |  |  |
Aggregate Notional Amount | 12,300 |  | $ 12,300 |
Start Date |  |  | Jan. 01, 2018 |
End Date |  |  | Dec. 28, 2018 |
Accrued Expenses [Member] | FX Contract 1 [Member] |  |  |  |
Foreign Currency Cash Flow Hedge [Line Items] |  |  |  |
Foreign Currency Cash Flow Hedge Asset at Fair Value | (16) |  | $ (16) |
Accrued Expenses [Member] | FX Contract 2 [Member] |  |  |  |
Foreign Currency Cash Flow Hedge [Line Items] |  |  |  |
Foreign Currency Cash Flow Hedge Asset at Fair Value | (313) |  | (313) |
Accrued Expenses [Member] | FX Contract 3 [Member] |  |  |  |
Foreign Currency Cash Flow Hedge [Line Items] |  |  |  |
Foreign Currency Cash Flow Hedge Asset at Fair Value | $ (333) |  | $ (333) |
Peso [Member] | FX Contract 1 [Member] |  |  |  |
Foreign Currency Cash Flow Hedge [Line Items] |  |  |  |
$/Foreign Currency | 0.0500 |  | 0.0500 |
Peso [Member] | FX Contract 2 [Member] |  |  |  |
Foreign Currency Cash Flow Hedge [Line Items] |  |  |  |
$/Foreign Currency | 0.0507 |  | 0.0507 |
Euro [Member] | FX Contract 3 [Member] |  |  |  |
Foreign Currency Cash Flow Hedge [Line Items] |  |  |  |
$/Foreign Currency | 1.2059 |  | 1.2059 |

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