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Income Tax (Tables)
 9 Months Ended
Sep. 30, 2017
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
 
2017
 
2016
 
2017

2016
Income taxes at statutory rates (federal and state)
 
$
(5,838
)
 
$
(5,339
)
 
$
22,487

 
$
20,620

Increase (decrease):
 
 
 
 
 
 
 
 

Differences required to be flowed-through by regulatory commissions
 
(302
)
 
(381
)
 
1,282

 
1,202

Other, net
 
21

 
246

 
(1,296
)
 
(528
)
Total provision for income taxes
 
$
(6,119
)
 
$
(5,474
)
 
$
22,473


$
21,294

Effective tax rate
 
41.9
%
 
40.5
%
 
39.4
%
 
41.0
%