Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Selected Quarterly Financial Data (Unaudited)

Schedule of quarterly financial information

Consolidated quarterly financial information for 2013 and 2012 is provided in the tables below (dollars in thousands, except per share amounts). 

	2013 Quarter Ended								2013
	March 31,		June 30,		Sept. 30,		Dec. 31,		Total
Operating revenues	$	686,652	$	915,822	$	1,152,392	$	699,762	$	3,454,628
Operations and maintenance	223,250		229,300		233,323		238,854		924,727
Operating income	86,923		259,812		415,688		83,900		846,323
Income taxes	12,469		77,043		131,912		9,167		230,591
Income from continuing operations	32,836		139,598		234,718		32,814		439,966
Net income attributable to common shareholders	24,444		131,207		226,163		24,260		406,074
Earnings Per Share:
Income from continuing operations attributable to common shareholders — Basic	$	0.22	$	1.19	$	2.06	$	0.22	$	3.69
Net income attributable to common shareholders — Basic	0.22		1.19		2.06		0.22		3.69
Income from continuing operations attributable to common shareholders — Diluted	0.22		1.18		2.04		0.22		3.66
Net income attributable to common shareholders — Diluted	0.22		1.18		2.04		0.22		3.66

	2012 Quarter Ended									2012
	March 31,			June 30,		Sept. 30,		Dec. 31,		Total
Operating revenues	$	620,631		$	878,576	$	1,109,475	$	693,122	$	3,301,804
Operations and maintenance	210,663			216,236		220,729		237,141		884,769
Operating income	48,007			254,489		447,970		101,289		851,755
Income taxes	(4,645		)	76,689		147,116		18,157		237,317
Income from continuing operations	284			130,930		252,874		34,905		418,993
Net income (loss) attributable to common shareholders	(8,257		)	122,345		244,823		22,631		381,542
Earnings Per Share:
Income (loss) from continuing operations attributable to common shareholders — Basic	$	(0.07	)	$	1.12	$	2.23	$	0.24	$	3.54
Net income (loss) attributable to common shareholders — Basic	(0.08		)	1.12		2.23		0.21		3.48
Income (loss) from continuing operations attributable to common shareholders — Diluted	(0.07		)	1.12		2.21		0.24		3.50
Net income (loss) attributable to common shareholders — Diluted	(0.08		)	1.11		2.21		0.20		3.45