Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details Textual)

v3.10.0.1
Fair Value of Financial Instruments (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
EUR (€)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Purchase amount of forward foreign exchange currency contract | €     € 370,000
Realized loss on forward foreign exchange contract $ (958) $ (2,535)  
Derivative expiration, description   expire at various dates through February 2019  
Forward Foreign Exchange Contracts [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Derivative instrument, notional amount $ 10,050 $ 10,050