Defined Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 32	$ 36	$ 96	$ 107
Interest cost	53	65	158	194
Expected return on plan assets	(68)	(63)	(205)	(190)
Amortization of net gain		(15)		(44)
Settlement loss (gain)			22	(37)
Net periodic benefit expense (income)	17	23	71	30
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1		2	2
Interest cost	3	5	9	13
Accretion of prior service cost	(5)	(5)	(15)	(15)
Amortization of net gain	(1)	(1)	(1)	(3)
Net periodic benefit expense (income)	$ (2)	$ (1)	$ (5)	$ (3)