Accounts Payable And Accrued Expenses (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Accounts Payable And Accrued Expenses [Abstract]
Accounts payable	$ 11,640,000	$ 12,264,000
Accrued salaries and bonuses	46,100,000	147,613,000
Accrued payroll taxes and benefits	23,582,000	29,443,000
Accrued contingent consideration	14,876,000	12,089,000
Accrued professional liabilities	13,742,000	13,218,000
Accrual for uncertain tax positions	3,242,000	3,242,000
Other accrued expenses	9,778,000	16,666,000
Accounts payable and accrued expenses, total	122,960,000	234,535,000
Net decrease in accrued salaries and bonuses	$ 101,500,000