Defined Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 153	$ 9	$ 161	$ 18
Interest cost	205	11	215	22
Expected return on plan assets	(211)		(211)
Amortization (accretion) of prior service cost	4	4	8	7
Settlement gain	(380)		(380)
Net periodic benefit (income) expense	(229)	24	(207)	47
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	2	2
Interest cost	5	5	9	10
Amortization (accretion) of prior service cost	(5)	$ (6)	(10)	$ (12)
Net periodic benefit (income) expense	$ 1		$ 1