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Accounts Receivable (Schedule Of Accounts Receivable) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Accounts Receivable [Abstract]  
Gross accounts receivable$ 721,147$ 603,372
Allowance for contractual adjustments and uncollectibles(514,087)(421,977)
Accounts receivable, net$ 207,060$ 181,395