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Employee Benefit Plans (Details 7) (Hedge Funds [Member], Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Hedge Funds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Reconciliation of changes in fair value measurements of plan assets
Beginning fair value	$ 2,167	$ 1,596
Purchases, sales, and settlements	1,815	500
Actual return on plan assets still held at reporting date	(85)	71
Ending fair value	$ 3,897	$ 2,167

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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