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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 8) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Concentrations      
Concentrations amount, gross $ 81,487 $ 58,978  
Third party payable (4,250) (3,771)  
Allowances (15,586) (5,236)  
Total 61,651 49,971  
Revenue | Revenue concentration
      
Concentrations      
Concentrations (as a percent) 100.00% 100.00% 100.00%
Revenue | Revenue concentration | Medicare
      
Concentrations      
Concentrations (as a percent) 71.30% 71.70% 77.10%
Revenue | Revenue concentration | Medicaid and other government programs
      
Concentrations      
Concentrations (as a percent) 23.60% 23.80% 19.00%
Revenue | Revenue concentration | Medicaid and other government programs | Ohio
      
Concentrations      
Concentrations (as a percent) 13.10% 13.70% 9.00%
Revenue | Revenue concentration | Medicaid and other government programs | Connecticut
      
Concentrations      
Concentrations (as a percent) 7.00% 6.60% 6.20%
Revenue | Revenue concentration | Medicaid and other government programs | Kentucky
      
Concentrations      
Concentrations (as a percent) 2.30% 2.70% 2.80%
Revenue | Revenue concentration | Medicaid and other government programs | Florida
      
Concentrations      
Concentrations (as a percent) 0.70% 0.50% 0.60%
Revenue | Revenue concentration | Medicaid and other government programs | Others
      
Concentrations      
Concentrations (as a percent) 0.50% 0.30% 0.40%
Revenue | Revenue concentration | All other payors
      
Concentrations      
Concentrations (as a percent) 5.10% 4.50% 3.90%
Accounts receivable | Revenue concentration | Medicare
      
Concentrations      
Concentrations (as a percent) 56.00% 59.10%  
Concentrations amount, gross 45,607 34,882  
Accounts receivable | Receivable concentration
      
Concentrations      
Concentrations (as a percent) 100.00% 100.00%  
Accounts receivable | Receivable concentration | Medicaid and other government programs
      
Concentrations      
Concentrations (as a percent) 26.70% 27.40%  
Concentrations amount, gross 21,765 16,118  
Accounts receivable | Receivable concentration | Medicaid and other government programs | Ohio
      
Concentrations      
Concentrations (as a percent) 7.70% 10.30%  
Concentrations amount, gross 6,310 6,092  
Accounts receivable | Receivable concentration | Medicaid and other government programs | Connecticut
      
Concentrations      
Concentrations (as a percent) 6.40% 10.30%  
Concentrations amount, gross 5,201 6,081  
Accounts receivable | Receivable concentration | Medicaid and other government programs | Kentucky
      
Concentrations      
Concentrations (as a percent) 4.70% 5.00%  
Concentrations amount, gross 3,793 2,931  
Accounts receivable | Receivable concentration | Medicaid and other government programs | Tennessee
      
Concentrations      
Concentrations (as a percent) 5.40% 0.00%  
Concentrations amount, gross 4,365    
Accounts receivable | Receivable concentration | Medicaid and other government programs | Others
      
Concentrations      
Concentrations (as a percent) 2.60% 1.80%  
Concentrations amount, gross 2,696 1,014  
Accounts receivable | Receivable concentration | All other payors
      
Concentrations      
Concentrations (as a percent) 17.30% 13.50%  
Concentrations amount, gross $ 14,115 $ 7,978