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Accounts Payable And Accrued Expenses (Schedule Of Accounts Payable And Accrued Expenses) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Accounts Payable And Accrued Expenses [Abstract]    
Accounts payable $ 12,264 $ 9,581
Accrued salaries and bonuses 147,613 132,221
Accrued payroll taxes and benefits 29,443 26,122
Accrued professional liability risks 13,218 11,876
Accrued contingent consideration 12,089 8,266
Accrual for uncertain tax positions 3,242 10,948
Other accrued expenses 16,666 8,923
Accounts payable and accrued expenses, total $ 234,535 $ 207,937