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Income Tax (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
Dollars in thousands
 
2018
 
2017
 
2018

2017
Income taxes at statutory rates (federal and state)
 
$
(135
)
 
$
2,603

 
$
15,233

 
$
29,912

Increase (decrease):
 
 
 
 
 
 
 
 

Differences required to be flowed-through by regulatory commissions
 
(14
)
 
66

 
835

 
1,584

Other, net
 
(7
)
 
(122
)
 
(592
)
 
(1,318
)
Total provision for income taxes on continuing operations
 
$
(156
)
 
$
2,547

 
$
15,476

 
$
30,178

Effective tax rate for continuing operations
 
31.5
%
 
38.5
%
 
27.1
%
 
39.9
%