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Fair Value and Derivative Instruments - Impact of Foreign Exchange Derivattive Contracts Designated as Cash Flow Hedges (Details) - Foreign exchange forward contracts - Designated as Hedging Instrument - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)       $ (1,096)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) $ 236 $ (207) $ 136 (448)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax (553) (642) 427  
Cost of revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 150 (126) 109 (297)
Research and development        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 23 (23) 11 (42)
Selling, general and administrative        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) $ 63 $ (58) $ 16 $ (109)