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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
[1]
Jun. 30, 2016
[1]
Mar. 31, 2016
[1]
Dec. 31, 2015
Sep. 30, 2015
[1]
Jun. 30, 2015
[1]
Mar. 31, 2015
[1]
Payables and Accruals [Abstract]                
Salaries and related costs $ 10,569       $ 9,414      
Credit balances and overpayments due to patients and payors 3,880       1,472      
Group health insurance claims 2,499       2,276      
Other 4,808       3,434      
Total $ 21,756 $ 23,216 $ 26,273 $ 20,684 $ 16,596 [1] $ 18,287 $ 19,446 $ 18,178
[1] as restated