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Financial Instruments and Fair Value Measurements (Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)) (Details) - Designated as Hedging Instrument [Member] - Forward Currency Contracts [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Derivatives designated as cash flow hedges:        
Gain (loss) recorded in other comprehensive income $ (29) $ 637 $ 397 $ 1,819
Gain (loss) reclassified from other comprehensive income into net income 131 558 646 933
Cost of Goods Sold [Member]        
Derivatives designated as cash flow hedges:        
Gain (loss) reclassified from other comprehensive income into net income 131 495 521 834
Design and Development Expense [Member]        
Derivatives designated as cash flow hedges:        
Gain (loss) reclassified from other comprehensive income into net income $ 0 $ 63 $ 125 $ 99