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Employee Benefit Plans (Schedule of Amounts Expected to be Amortized from Regulaotry Assets to Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Pension Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected amortized actuarial Loss	$ 1,646
Expected amortized prior service credit
Other Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected amortized actuarial Loss	2,261
Expected amortized prior service credit	$ (1,728)