Pension Plans (Components of Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 32	$ 0	$ 94
Interest cost	449	368	1,275	1,134
Expected return on plan assets	(360)	(177)	(1,154)	(836)
Amortization of net (gain)/loss	155	(87)	611	16
Net periodic pension cost	244	136	732	408
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	367	328	1,111	984
Expected return on plan assets	(360)	(177)	(1,154)	(836)
Amortization of net (gain)/loss	282	(93)	733	26
Net periodic pension cost	289	58	690	174
SERP
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	32	0	94
Interest cost	82	40	164	150
Expected return on plan assets	0	0	0	0
Amortization of net (gain)/loss	(127)	6	(122)	(10)
Net periodic pension cost	$ (45)	$ 78	$ 42	$ 234