Pension Plans (Components of Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	360	413	723	826
Expected return on plan assets	(325)	(397)	(650)	(794)
Amortization of net (gain)/loss	180	228	358	456
Net periodic pension cost	215	244	431	488
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	305	372	613	744
Expected return on plan assets	(325)	(397)	(650)	(794)
Amortization of net (gain)/loss	221	223	440	446
Net periodic pension cost	201	198	403	396
SERP
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	55	41	110	82
Expected return on plan assets	0	0	0	0
Amortization of net (gain)/loss	(41)	5	(82)	10
Net periodic pension cost	$ 14	$ 46	$ 28	$ 92