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Employee Benefit Plans (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Employee Benefit Plans [Abstract]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation	$ 93,101	$ 69,625
Defined Benefit Plan Pension Plans With Projected Benefit Obligations In Excess Of Plan Assets Fair Value Of Plan Assets	$ 41,300	$ 35,888

If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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