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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2018
Income Taxes [Abstract]  
Provision for Income Taxes and Effective Tax Rates
The following table presents the (benefit) provision for income taxes and the effective tax rates:

(in thousands)
 
 
Three months ended
September 30,
  
Nine months ended
September 30,
 
  
2018
  
2017
  
2018
  
2017
 
             
Provision for income taxes
 
$
314
  
$
92
  
$
124
  
$
399
 
Effective tax rate
  
(153.9
)%
  
(17.9
)%
  
(13.6
)%
  
112.4
%