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ACCRUED EXPENSES (Tables)
 3 Months Ended
Mar. 31, 2016
ACCRUED EXPENSES [Abstract]  
Summary of Accrued Expenses
Accrued expenses as of March 31, 2016 and December 31, 2015 consisted of the following (in thousands):

  
March 31, 2016
  
December 31, 2015
 
Salaries and related costs
 
$
12,202
  
$
9,414
 
Group health insurance claims
  
2,496
   
2,276
 
Credit balances due to patients and payors
  
1,446
   
1,472
 
Other
  
4,540
   
3,434
 
Total
 
$
20,684
  
$
16,596