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Income Tax (Tables)
 9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The effective income tax rate varied from the combined federal and state statutory tax rates due to the following:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Dollars in thousands
 
2018
 
2017
 
2018

2017
Income taxes at statutory rates (federal and state)
 
$
(4,136
)
 
$
(5,440
)
 
$
11,097

 
$
24,472

Increase (decrease):
 
 
 
 
 
 
 
 

Differences required to be flowed-through by regulatory commissions
 
(266
)
 
(302
)
 
569

 
1,282

Other, net
 
117

 
20

 
(475
)
 
(1,298
)
Total provision (benefit) for income taxes on continuing operations
 
$
(4,285
)
 
$
(5,722
)
 
$
11,191

 
$
24,456

Effective tax rate for continuing operations
 
27.8
%
 
42.0
%
 
26.8
%
 
39.4
%