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Pension Benefit and Retirement Health and Life Insurance Benefits (Fair Value of Net Assets by Asset Category) (Details) (Pension Benefits [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	$ 143,540	$ 120,565	$ 125,261
Pooled separate accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	29,869	32,072
Mutual funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	98,269	47,255
Common stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0	27,804
Guaranteed deposit account [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	15,402	13,266
Interest bearing cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	$ 0	$ 168

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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