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Retirement Plans (Effect of Level 3 Investments on Plan Financial Activity) (Details) (USD $) In Thousands, unless otherwise specified						12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Real estate [Member]	Dec. 31, 2011 Real estate [Member]	Dec. 31, 2011 Real estate [Member] Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 29,418	$ 25,451	$ 23,760	$ 1,312	$ 1,320	$ 531
Total gains						15
Transfer out of Level 3						(546)
Fair value of plan assets at end of year	$ 29,418	$ 25,451	$ 23,760	$ 1,312	$ 1,320

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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