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10. NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Nature Of Business And Basis Of Presentation Details
Commercial Insurance/Managed Care Capitation	$ 111,963	$ 100,795	$ 301,618	$ 340,750
Medicare	33,492	28,840	87,539	103,899
Medicaid	5,663	4,759	14,734	16,250
Workers Compensation/Personal Injury	7,281	6,201	19,501	21,174
Other	8,629	7,985	22,640	25,200
Service fee revenue, net of contractual allowances and discounts	167,027	148,579	446,032	507,273
Provision for bad debts	(6,574)	(5,558)	(16,260)	(19,453)
Net service fee revenue	$ 160,453	$ 143,021	$ 429,772	$ 487,820

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