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Derivatives - Fair Value by Balance Sheet Location (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Derivative [Line Items]    
Derivative liability $ (101) $ (487)
Foreign currency contracts | Not Designated as Hedging Instrument | Accounts payable and accrued liabilities    
Derivative [Line Items]    
Derivative liability $ (101) $ (487)