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Derivatives - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments,Gain (Loss) [Line Items]    
Net gain (loss) on foreign currency exchange contracts $ (271) $ (1,331)
Not Designated as Hedging Instrument | Foreign Currency Exchange Contracts | Other Income (Expense), Net    
Derivative Instruments,Gain (Loss) [Line Items]    
Net gain (loss) on foreign currency exchange contracts $ (300) $ (1,300)