Pension (Net Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension [Abstract]
Service cost - benefits earned during the period	$ 152	$ 128	$ 305	$ 257
Interest cost on projected benefit obligation	951	973	1,901	1,946
Expected Return on Plan Assets	(1,438)	(1,438)	(2,875)	(2,876)
Amortization of Prior Service Cost	(67)	(68)	(135)	(136)
Defined Benefit Plan, Amortization of Gain (Loss)	(592)	(617)	(1,184)	(1,234)
Net periodic pension cost	$ 190	$ 212	$ 380	$ 425