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Derivative Financial Instruments - Narratives (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Derivative
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax	$ 452	$ 867
Foreign exchange derivative
Derivative
Derivative Asset	463
Derivative Liability	68
Cash Flow Hedge \| Designated As Hedging \| Foreign currency forward contracts
Derivative
Foreign currency cash flow hedge gain to be reclassified during next 12 months	432
Derivative, notional amount	11,738
Derivative Asset	395
Derivative Liability			$ 393	$ (742)
Cash Flow Hedge \| Designated As Hedging \| Interest rate swap
Derivative
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months	127
Derivative Asset	$ (372)		$ 945	$ 971