Income Tax (tables)

6 Months Ended

Jun. 30, 2014

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expenses (Benefit)

	Three Months Ended June 30,						Six Months Ended June 30,
Dollars in thousands	2014			2013			2014			2013
Income tax at statutory rates (federal and state)	$	728		$	1,330		$	26,449		$	26,569
Increase (decrease):
Differences required to be flowed-through by regulatory commissions	61			52			1,494			1,564
Other, net	(9		)	(44		)	(178		)	(835		)
Income tax expense	$	780		$	1,338		$	27,765		$	27,298
Effective income tax rate	42.1		%	38.6		%	41.6		%	40.7		%