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Derivative Financial Instruments (Schedule of Derivative Instruments) (Details) - Foreign Exchange Contract [Member]
SFr in Thousands
9 Months Ended
Sep. 30, 2018
CHF (SFr)
contract
Derivative [Line Items]  
Number of Contracts | contract 2
Aggregate Notional Amount in Foreign Currency | SFr SFr 6,002
Minimum [Member]  
Derivative [Line Items]  
Maturity Date Nov. 01, 2018
Maximum [Member]  
Derivative [Line Items]  
Maturity Date Mar. 01, 2019