Pension Plans (Components of Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	358	449	1,082	1,275
Expected return on plan assets	(325)	(360)	(976)	(1,154)
Amortization of net (gain)/loss	153	155	511	611
Net periodic pension cost	186	244	617	732
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	303	367	917	1,111
Expected return on plan assets	(325)	(360)	(976)	(1,154)
Amortization of net (gain)/loss	194	282	634	733
Net periodic pension cost	172	289	575	690
SERP
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	55	82	165	164
Expected return on plan assets	0	0	0	0
Amortization of net (gain)/loss	(41)	(127)	(123)	(122)
Net periodic pension cost	$ 14	$ (45)	$ 42	$ 42