Defined Benefit Plans (Net Periodic Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 8	$ 6
Interest Cost	11	12
Amortization of prior service cost	5	5
Net periodic postretirement benefit cost	24	23
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	4	5
Interest Cost	9	9
Net periodic postretirement benefit cost	$ 13	$ 14