Pension Plans (Components of Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	363	413
Expected return on plan assets	(325)	(397)
Amortization of net (gain)/loss	178	228
Net periodic pension cost	216	244
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	308	372
Expected return on plan assets	(325)	(397)
Amortization of net (gain)/loss	219	223
Net periodic pension cost	202	198
SERP
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	55	41
Expected return on plan assets	0	0
Amortization of net (gain)/loss	(41)	5
Net periodic pension cost	$ 14	$ 46