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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 7) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Concentrations      
Concentrations amount, gross 58,978 54,642  
Third party payable (3,771) (2,812)  
Allowances (5,236) (6,664)  
Total 49,971 45,166  
Revenue | Revenue concentration
      
Concentrations      
Concentrations (as a percent) 100.00% 100.00% 100.00%
Revenue | Revenue concentration | Medicare
      
Concentrations      
Concentrations (as a percent) 70.70% 77.10% 80.90%
Revenue | Revenue concentration | Medicaid and other government programs
      
Concentrations      
Concentrations (as a percent) 23.30% 18.50% 14.50%
Revenue | Revenue concentration | Medicaid and other government programs | Ohio
      
Concentrations      
Concentrations (as a percent) 13.40% 8.70% 4.10%
Revenue | Revenue concentration | Medicaid and other government programs | Connecticut
      
Concentrations      
Concentrations (as a percent) 6.50% 6.10% 6.00%
Revenue | Revenue concentration | Medicaid and other government programs | Kentucky
      
Concentrations      
Concentrations (as a percent) 2.60% 2.70% 3.10%
Revenue | Revenue concentration | Medicaid and other government programs | Florida
      
Concentrations      
Concentrations (as a percent) 0.50% 0.60% 0.70%
Revenue | Revenue concentration | Medicaid and other government programs | Others
      
Concentrations      
Concentrations (as a percent) 0.30% 0.40% 0.60%
Revenue | Revenue concentration | All other payors
      
Concentrations      
Concentrations (as a percent) 6.00% 4.40% 4.60%
Accounts receivable | Receivable concentration
      
Concentrations      
Concentrations (as a percent) 100.00% 100.00%  
Accounts receivable | Receivable concentration | Medicare
      
Concentrations      
Concentrations (as a percent) 59.10% 58.80%  
Concentrations amount, gross 34,882 32,150  
Accounts receivable | Receivable concentration | Medicaid and other government programs
      
Concentrations      
Concentrations (as a percent) 27.40% 31.20%  
Concentrations amount, gross 16,118 17,060  
Accounts receivable | Receivable concentration | Medicaid and other government programs | Ohio
      
Concentrations      
Concentrations (as a percent) 10.30% 14.30%  
Concentrations amount, gross 6,092 7,828  
Accounts receivable | Receivable concentration | Medicaid and other government programs | Connecticut
      
Concentrations      
Concentrations (as a percent) 10.30% 8.70%  
Concentrations amount, gross 6,081 4,730  
Accounts receivable | Receivable concentration | Medicaid and other government programs | Kentucky
      
Concentrations      
Concentrations (as a percent) 5.00% 6.20%  
Concentrations amount, gross 2,931 3,387  
Accounts receivable | Receivable concentration | Medicaid and other government programs | Others
      
Concentrations      
Concentrations (as a percent) 1.80% 2.00%  
Concentrations amount, gross 1,014 1,115  
Accounts receivable | Receivable concentration | All other payors
      
Concentrations      
Concentrations (as a percent) 13.50% 10.00%  
Concentrations amount, gross 7,978 5,432