Pension (Net Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension [Abstract]
Service cost - benefits earned during the period	$ 153	$ 129
Interest cost on projected benefit obligation	950	973
Expected Return on Plan Assets	(1,437)	(1,438)
Amortization of Prior Service Cost	(68)	(68)
Defined Benefit Plan, Amortization of Gain (Loss)	(592)	(617)
Net periodic pension cost	$ 190	$ 213