Defined Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 36	$ 9
Interest cost	65	9
Expected return on plan assets	(63)
Amortization (accretion) of prior service cost		4
Amortization of net (gain) or loss	(15)
Net periodic benefit expense (income)	23	22
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	4	4
Amortization (accretion) of prior service cost	(5)	$ (5)
Amortization of net (gain) or loss	(1)
Net periodic benefit expense (income)	$ (1)