Defined Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 33	$ 32	$ 98	$ 96
Interest cost	40	53	120	158
Expected return on plan assets	(57)	(68)	(170)	(205)
Settlement (gain) loss			(49)	22
Net periodic benefit expense (income)	16	17	(1)	71
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	2	2
Interest cost	3	3	7	9
Accretion of prior service cost	(5)	(5)	(15)	(15)
Amortization of net loss (gain)	$ 1	(1)	5	(1)
Net periodic benefit expense (income)		$ (2)	$ (1)	$ (5)