Defined Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 36	$ 153	$ 72	$ 161
Interest cost	65	205	129	215
Expected return on plan assets	(63)	(211)	(127)	(211)
Amortization (accretion) of prior service cost		4		8
Amortization of net (gain) or loss	(15)		(30)
Settlement gain	(37)	(380)	(37)	(380)
Net periodic benefit (income) expense	(14)	(229)	7	(207)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	2	2
Interest cost	4	5	8	9
Amortization (accretion) of prior service cost	(5)	(5)	(10)	(10)
Amortization of net (gain) or loss	(1)		(2)
Net periodic benefit (income) expense	$ (1)	$ 1	$ (2)	$ 1