Derivative Instruments - Forward Contract Hedges in the Consolidated Condensed Balance Sheets (Details) - Cash Flow Hedging - Designated as hedging instrument - Foreign Exchange Forward - USD ($) $ in Thousands |
Mar. 29, 2019 |
Dec. 31, 2018 |
---|---|---|
Other accrued liabilities | ||
Derivative [Line Items] | ||
Foreign currency forward designated as cash flow hedge, liability | $ 413 | $ 351 |
Other non-current liabilities | ||
Derivative [Line Items] | ||
Foreign currency forward designated as cash flow hedge, liability | $ 43 | $ 7 |