Pension Plans (Components of Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	124	360	469	723
Expected return on plan assets	(203)	(325)	(528)	(650)
Amortization of net (gain)/loss	205	180	376	358
Net periodic pension cost	126	215	317	431
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	104	305	410	613
Expected return on plan assets	(203)	(325)	(528)	(650)
Amortization of net (gain)/loss	158	221	368	440
Net periodic pension cost	59	201	250	403
SERP
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	20	55	59	110
Expected return on plan assets	0	0	0	0
Amortization of net (gain)/loss	47	(41)	8	(82)
Net periodic pension cost	$ 67	$ 14	$ 67	$ 28