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Accounts Payable And Accrued Expenses (Details) (USD $)
9 Months Ended12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Accounts Payable And Accrued Expenses [Abstract]  
Accounts payable$ 9,835,000$ 9,581,000
Accrued salaries and bonuses114,014,000132,221,000
Accrued payroll taxes and benefits31,018,00026,122,000
Accrued professional liabilities11,688,00011,876,000
Accrual for uncertain tax positions10,452,00010,948,000
Other accrued expenses23,062,00017,189,000
Accounts payable and accrued expenses, total200,069,000207,937,000
Net decrease in accrued salaries and bonuses18,200,000 
Accrued salaries and bonuses, net$ 114,000,000$ 132,200,000