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Derivatives - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Net gain (loss) on foreign currency exchange contracts $ 545 $ (3,603) $ (1,251)
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 $ 500 $ (3,600) $ (1,300)