Defined Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 45	$ 36	$ 64	$ 72
Interest cost	60	65	105	129
Expected return on plan assets	(68)	(63)	(136)	(127)
Amortization of net gain		(15)		(30)
Settlement loss (gain)	22	(37)	22	(37)
Net periodic benefit expense (income)	59	(14)	55	7
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1	2
Interest cost	6	4	6	8
Accretion of prior service cost	(5)	(5)	(10)	(10)
Amortization of net gain		(1)		(2)
Net periodic benefit expense (income)	$ 2	$ (1)	$ (3)	$ (2)