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Accrued Expenses (Tables)
 12 Months Ended
Dec. 31, 2017
Accrued Expenses [Abstract]  
Summary of Accrued Expenses
Accrued expenses as of December 31, 2017 and 2016 consisted of the following (in thousands):

  
December 31, 2017
  
December 31, 2016
 
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
   
-
 
Other
  
6,594
   
4,808
 
Total
 
$
33,342
  
$
21,756