Pension (Net Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Pension [Abstract]
Service cost - benefits earned during the period	$ 127	$ 193	$ 432	$ 450
Interest cost on projected benefit obligation	916	923	2,817	2,869
Expected Return on Plan Assets	(1,067)	(1,463)	(3,942)	(4,339)
Amortization of Prior Service Cost	(68)	(67)	(203)	(203)
Defined Benefit Plan, Amortization of Gain (Loss)	592	630	1,776	1,864
Net periodic pension cost	$ 500	$ 216	$ 880	$ 641