Defined Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 36	$ 82	$ 107	$ 242
Interest cost	65	107	194	322
Expected return on plan assets	(63)	(106)	(190)	(317)
Amortization (accretion) of prior service cost		4		13
Amortization of net (gain) or loss	(15)		(44)
Settlement gain		(117)	(37)	(497)
Net periodic benefit (income) expense	23	(30)	30	(237)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		1	2	3
Interest cost	5	4	13	13
Amortization (accretion) of prior service cost	(5)	$ (5)	(15)	(15)
Amortization of net (gain) or loss	(1)		(3)
Net periodic benefit (income) expense	$ (1)		$ (3)	$ 1