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Derivatives - Impact of Derivatives Contracts on Condensed Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Derivative assets $ 0 $ 0
Derivative liabilities (45) (487)
Not Designated as Hedging Instrument | Foreign currency contracts | Accounts payable and accrued liabilities    
Derivative [Line Items]    
Derivative liabilities $ (45) $ (487)