Foreign Currency Contracts Notional Values (Details) - USD ($) $ in Thousands |
Sep. 27, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Derivative, Notional Amount | $ 115,860 | $ 118,612 |
| Foreign currency contracts related to customer sales contracts | Not Designated As Hedging Instrument [Member] | ||
| Derivative, Notional Amount | 24,868 | 43,510 |
| Foreign currency contracts related to supplier purchase contracts | Not Designated As Hedging Instrument [Member] | ||
| Derivative, Notional Amount | $ 90,992 | $ 75,102 |