1. NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Nature Of Business And Basis Of Presentation
Commercial Insurance/Managed Care Capitation	$ 97,685	$ 91,745
Medicare	22,583	21,626
Medicaid	35,713	34,077
Workers Compensation/Personal Injury	5,777	5,570
Other	18,004	15,483
Service fee revenue, net of contractual allowances and discounts	179,762	168,500
Provision for bad debts	(6,822)	(6,484)
Net service fee revenue	$ 172,940	$ 162,016