Defined Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 33	$ 45	$ 65	$ 64
Interest cost	40	60	80	105
Expected return on plan assets	(57)	(68)	(113)	(136)
Settlement (gain) loss		22	(49)	22
Net periodic benefit (income) expense	16	59	(17)	55
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		1	1	1
Interest cost	2	6	4	6
Accretion of prior service cost	(5)	(5)	(10)	(10)
Amortization of net loss	4		4
Net periodic benefit (income) expense	$ 1	$ 2	$ (1)	$ (3)