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Retirement Plans (Fair Value Measurements) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 29,418	$ 25,451	$ 23,760
Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,951	11,814
Debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13,155	12,316
Real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,312	1,320
Level 1 [Member] \| Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	967	786
Level 2 [Member] \| Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13,984	11,028
Level 2 [Member] \| Debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13,155	12,316
Level 2 [Member] \| Real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,312	1,320
Level 3 [Member] \| Real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			$ 531

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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