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Derivatives - Fair Value by Balance Sheet Location (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Derivative asset $ 0 $ 146
Derivative liability (487) 0
Foreign currency contracts | Not Designated as Hedging Instrument | Accounts receivable, net    
Derivative [Line Items]    
Derivative asset 0 146
Foreign currency contracts | Not Designated as Hedging Instrument | Accrued and other current liabilities    
Derivative [Line Items]    
Derivative liability $ (487) $ 0