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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivatives designated as cash flow hedges:        
Gain (loss) recorded in other comprehensive income $ 145 $ (33) $ 661 $ (527)
Gain (loss) reclassified from other comprehensive income into net income $ 155 $ (74) $ 184 $ (118)