Derivative Financial Instruments Settled Foreign Currency Exchange Rate Agreements (Details) - Foreign Currency Forward 1 [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) $ / $
Derivative [Line Items]
Effective Date	Apr. 18, 2018
Maturity Date	Jul. 05, 2018
Notional Amount | $	$ 5,379
Exchange Rate | $ / $	0.78