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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