Defined Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 9	$ 8
Interest Cost	12	11
Amortization of prior service cost	5	4
Net periodic postretirement benefit cost	26	23
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	1	3
Interest Cost	6	8
Amortization of prior service cost	6
Net periodic postretirement benefit cost	$ 13	$ 11