Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Derivatives and Hedging Activities (Schedule of Balance Sheet Classification and Fair Values of Derivative Instruments) (Details)

v3.8.0.1
Derivatives and Hedging Activities (Schedule of Balance Sheet Classification and Fair Values of Derivative Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Notional amount of derivative asset $ 83,500  
Fair value (978) $ (568)
Notional amount 99,719 100,873
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other current assets [Member]    
Derivatives, Fair Value [Line Items]    
Fair value derivative asset 121 90
Notional amount of derivative asset 35,453 22,036
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Accrued expenses and other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Fair value derivative liability (1,103) (921)
Notional amount of derivative liability 48,018 65,668
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other current assets [Member] | Cash Flow Hedge [Member]    
Derivatives, Fair Value [Line Items]    
Fair value derivative asset 24 263
Notional amount of derivative asset 7,788 13,169
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Accrued expenses and other current liabilities [Member] | Cash Flow Hedge [Member]    
Derivatives, Fair Value [Line Items]    
Fair value derivative liability (20)
Notional amount of derivative liability $ 8,460