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Derivatives - Impact of Derivative Instruments on Income Statement (Details) - Foreign currency contracts - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]      
Total net gain (loss) on foreign currency contracts $ (2,333) $ (360) $ 210
Other income, net      
Derivative [Line Items]      
Unrealized gain (loss) on foreign currency contracts (634) (64) 210
Realized loss on foreign currency contracts $ (1,699) $ (296) $ 0