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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Income tax provision
The income tax benefit (provision) for the years ended December 31, 2017, 2016, and 2015 comprised the following (in thousands):
 
 
Years Ended December 31, 
 
2017
 
2016
 
2015
Federal income taxes:
    
 
    
 
 
Current
$
(516
)
 
$
(197
)
 
$
102

Deferred
(131
)
 
(109
)
 
(72
)
State income taxes:
 
 
 
 
 
Current
(62
)
 
(24
)
 
13

Deferred
(16
)
 
(13
)
 
(9
)
Income tax benefit (provision)
$
(725
)
 
$
(343
)
 
$
34