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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Salaries and related costs $ 20,363 $ 16,828
Credit balances due to patients and payors 6,050 4,158
Group health insurance claims 2,969 2,929
Income taxes payable 0 2,833
Other 5,985 6,594
Total $ 35,367 $ 33,342