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)

v3.10.0.1
Derivatives and Hedging Activities (Schedule of Balance Sheet Classification and Fair Values of Derivative Instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Notional amount of derivative asset $ 85,600  
Fair value 994 $ (568)
Notional amount 109,127 100,873
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other current assets [Member]    
Derivatives, Fair Value [Line Items]    
Fair value derivative asset 1,854 90
Notional amount of derivative asset 51,667 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 (320) (921)
Notional amount of derivative liability 33,923 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 263
Notional amount of derivative asset 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 (540)
Notional amount of derivative liability $ 23,537