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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Salaries and related costs $ 21,726 $ 16,828
Credit balances due to patients and payors 7,293 4,158
Group health insurance claims 3,124 2,929
Income taxes payable 0 2,833
Other 6,350 6,594
Total $ 38,493 $ 33,342