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NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Nature Of Business And Basis Of Presentation Details
Commercial Insurance	$ 115,332	$ 104,297	$ 228,788	$ 201,255
Managed Care Capitated Payors	34,500	29,842	68,107	58,410
Medicare	5,833	4,924	11,572	9,831
Medicaid	7,500	6,416	14,878	13,012
Other	8,581	7,891	16,901	14,945
Service fee revenue, net of contractual allowances and discounts	171,746	153,370	340,246	297,453
Provision for bad debts	(6,395)	(5,671)	(12,879)	(10,702)
Net service fee revenue	$ 165,351	$ 147,699	$ 327,367	$ 286,751

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