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Commitments and Contingencies Incurred But Not Reported Health Benefit Cost Accrual (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
IBNR accrual	$ 2,460	$ 2,056

The accrued obligation as of the balance sheet date which represents the cost of settling insured claims and insured claims relating to insured events that have occurred but have not yet been reported to the insurer or reinsurer as of the date of the financial statements.

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