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Pension (Reconciliation of Level 3 Inputs on Changes in Pension Plan Assets) (Details) (Defined Benefit Pension Plans and SERP, USD $) In Thousands, unless otherwise specified				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Level Three	Dec. 31, 2011 Level Three
Change in fair value of plan assets:
Fair value of plan assets, beginning of year	$ 382,266	$ 274,029	$ 257,969	$ 38,961	$ 35,989
Change in unrealized appreciation (depreciation)				2,743	(1,621)
Net purchases				12,152	4,593
Fair value of plan assets, end of year	$ 382,266	$ 274,029	$ 257,969	$ 53,856	$ 38,961

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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