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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
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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

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