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Derivative Instruments - Derivatives not designated as hedging instruments (Details) - Not Designated as Hedging Instrument [Member] - Foreign Exchange Contract [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative [Line Items]        
Derivative, Notional Amount $ 96,200   $ 96,200  
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net $ 220 $ 0 $ 220 $ 0