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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Salaries and related costs $ 16,828 $ 10,569
Credit balances due to patients and payors 4,158 3,880
Group health insurance claims 2,929 2,499
Federal income tax payable 2,833 0
Other 6,594 4,808
Total $ 33,342 $ 21,756