Income Tax (tables)

9 Months Ended

Sep. 30, 2014

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expenses (Benefit)

	Three Months Ended September 30,						Nine Months Ended September 30,
Dollars in thousands	2014			2013			2014			2013
Income tax at statutory rates (federal and state)	$	(6,161	)	$	(5,489	)	$	20,288		$	21,080
Increase (decrease):
Differences required to be flowed-through by regulatory commissions	(310		)	(393		)	1,184			1,171
Other, net	(271		)	281			(449		)	(554		)
Income tax expense (benefit)	$	(6,742	)	$	(5,601	)	$	21,023		$	21,697
Effective income tax rate	43.6		%	40.5		%	41.0		%	40.8		%