18.

Quarterly Financial Information (in thousands, except per share amounts) (unaudited)


	1st Quarter			2nd Quarter		3rd Quarter		4th Quarter
2010
Operating revenues	$	271,598		$	306,992	$	378,663	$	505,678
Operating income		7,831			45,757		52,509		94,828
Income from continuing operations, net of income taxes		4,186			29,528		29,374		54,810
Loss from discontinued operations, net of income taxes		—			—		—		(956	)
Net income		4,186			29,528		29,374		53,854
Basic income (loss) per common share:
From continuing operations	$	0.03		$	0.19	$	0.19	$	0.36
From discontinued operations	$	0.00		$	0.00	$	0.00	$	(0.01	)
Net income	$	0.03		$	0.19	$	0.19	$	0.35
Diluted income (loss) per common share:
From continuing operations	$	0.03		$	0.19	$	0.19	$	0.35
From discontinued operations	$	0.00		$	0.00	$	0.00	$	(0.01	)
Net income	$	0.03		$	0.19	$	0.19	$	0.35
2011
Operating revenues	$	567,404		$	600,064	$	673,828	$	724,647
Operating income		117,547			131,860		132,294		143,900
Income from continuing operations, net of income taxes		71,619			81,638		81,928		87,595
Loss from discontinued operations, net of income taxes		(367	)		—		—		—
Net income		71,252			81,638		81,928		87,595
Basic income (loss) per common share:
From continuing operations	$	0.46		$	0.53	$	0.53	$	0.56
From discontinued operations	$	0.00		$	0.00	$	0.00	$	0.00
Net income	$	0.46		$	0.53	$	0.53	$	0.56
Diluted income (loss) per common share:
From continuing operations	$	0.46		$	0.52	$	0.53	$	0.56
From discontinued operations	$	0.00		$	0.00	$	0.00	$	0.00
Net income	$	0.46		$	0.52	$	0.53	$	0.56