Pension Plans (Components of Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 33	$ 0	$ 62
Interest cost	413	379	826	766
Expected return on plan assets	(397)	(556)	(794)	(659)
Amortization of net (gain)/loss	228	51	456	103
Net periodic pension cost (income)	244	(93)	488	272
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	372	326	744	656
Expected return on plan assets	(397)	(556)	(794)	(659)
Amortization of net (gain)/loss	223	59	446	119
Net periodic pension cost (income)	198	(171)	396	116
SERP
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	33	0	62
Interest cost	41	53	82	110
Expected return on plan assets	0	0	0	0
Amortization of net (gain)/loss	5	(8)	10	(16)
Net periodic pension cost (income)	$ 46	$ 78	$ 92	$ 156