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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Salaries and related costs $ 21,131 $ 21,726
Credit balances due to patients and payors 7,662 7,293
Group health insurance claims 2,815 3,124
Other 7,629 6,350
Total $ 39,237 $ 38,493