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Derivative Financial Instruments - Narratives (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Sep. 21, 2016
Derivative
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax	$ 784	$ 59
Foreign exchange derivative
Derivative
Derivative Asset	718
Derivative Liability	0
Cash Flow Hedge \| Designated As Hedging \| Foreign currency forward contracts
Derivative
Foreign currency cash flow hedge gain to be reclassified during next 12 months	784
Derivative, notional amount	8,625
Derivative Asset	718
Derivative Liability			$ 393	$ (742)
Cash Flow Hedge \| Designated As Hedging \| Interest rate swap
Derivative
Derivative, notional amount					$ 50,000
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months	235
Derivative Asset	$ 252		$ 945	$ 971