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Commitments and Contingencies Health Benefit Plan Costs (Details) (USD $)
In Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Plan Costs $ 5,927 $ 4,316 $ 12,671 $ 9,402