Defined Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 9	$ 8	$ 26	$ 25
Interest Cost	12	11	35	34
Amortization of prior service cost	8	4	33	11
Net periodic postretirement benefit cost	29	23	94	70
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	1	3	3	9
Interest Cost	6	8	17	24
Amortization of prior service cost	3		94
Net periodic postretirement benefit cost	$ 10	$ 11	$ 114	$ 33