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Other Income (Expense), Net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other Income and Expenses [Abstract]        
Net gain (loss) on foreign currency exchange contracts $ 69 $ (1,488) $ 603 $ (2,852)
Net gain (loss) on foreign currency exchange transactions (2,377) 1,176 (4,617) 2,512
Other income 26 373 63 342
Other income (expense), net $ (2,282) $ 61 $ (3,951) $ 2