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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Salaries and related costs $ 18,631 $ 10,569
Credit balances due to patients and payors 4,157 3,880
Group health insurance claims 2,630 2,499
Other 6,074 4,808
Total $ 31,492 $ 21,756