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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 $ 14,961 $ 7,553
Charged to Expense 14,586 10,273
Deductions (11,444) [1] (6,644) [1]
Balance at End of Period $ 18,103 $ 11,182
[1] Deductions represent accounts written off, net of recoveries.