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Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $)
In Thousands
6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Allowance for Doubtful Accounts [Member]
  
Allowance for doubtful accounts receivable:  
Balance at Beginning of Period$ 30,112$ 7,553
Charged to Expense18,27719,563
Deductions(11,444)[1](6,644)[1]
Balance at End of Period$ 36,945$ 20,472
[1]Deductions represent accounts written off, net of recoveries.