SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 8) (Accounts receivable net of contractual allowances, Receivable concentration)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Concentrations
Concentrations (as a percent)	100.00%	100.00%
0-90
Concentrations
Concentrations (as a percent)	65.00%	67.00%
91-180
Concentrations
Concentrations (as a percent)	20.00%	17.00%
181-365
Concentrations
Concentrations (as a percent)	9.00%	8.00%
>1 yr.
Concentrations
Concentrations (as a percent)	6.00%	8.00%
Medicare
Concentrations
Concentrations (as a percent)	60.00%	58.00%
Medicare | 0-90
Concentrations
Concentrations (as a percent)	39.00%	41.00%
Medicare | 91-180
Concentrations
Concentrations (as a percent)	14.00%	12.00%
Medicare | 181-365
Concentrations
Concentrations (as a percent)	5.00%	4.00%
Medicare | >1 yr.
Concentrations
Concentrations (as a percent)	2.00%	1.00%
Medicaid and other government programs
Concentrations
Concentrations (as a percent)	27.00%	32.00%
Medicaid and other government programs | 0-90
Concentrations
Concentrations (as a percent)	20.00%	20.00%
Medicaid and other government programs | 91-180
Concentrations
Concentrations (as a percent)	3.00%	4.00%
Medicaid and other government programs | 181-365
Concentrations
Concentrations (as a percent)	2.00%	3.00%
Medicaid and other government programs | >1 yr.
Concentrations
Concentrations (as a percent)	2.00%	5.00%
Self Pay
Concentrations
Concentrations (as a percent)	4.00%	3.00%
Self Pay | 0-90
Concentrations
Concentrations (as a percent)	2.00%	2.00%
Self Pay | 91-180
Concentrations
Concentrations (as a percent)	1.00%	0.00%
Self Pay | 181-365
Concentrations
Concentrations (as a percent)	0.00%	0.00%
Self Pay | >1 yr.
Concentrations
Concentrations (as a percent)	1.00%	1.00%
Insurance
Concentrations
Concentrations (as a percent)	9.00%	7.00%
Insurance | 0-90
Concentrations
Concentrations (as a percent)	4.00%	4.00%
Insurance | 91-180
Concentrations
Concentrations (as a percent)	2.00%	1.00%
Insurance | 181-365
Concentrations
Concentrations (as a percent)	2.00%	1.00%
Insurance | >1 yr.
Concentrations
Concentrations (as a percent)	1.00%	1.00%