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Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2012

Summary Of Unaudited Quarterly Financial Information


		1^st Quarter				2^nd Quarter				3rd Quarter				4th Quarter
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 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 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
2012
Operating revenues		$	745,921			$	681,112			$	643,631			$	652,750
Operating income			157,664				150,894				88,594				100,209
Income from continuing operations, net of income taxes			97,274				92,538				50,806				58,859
Loss from discontinued operations, net of income taxes			—				—				—				—
Net income			97,274				92,538				50,806				58,859
Basic income per common share:
From continuing operations		$	0.62			$	0.60			$	0.34			$	0.40
From discontinued operations		$	0.00			$	0.00			$	0.00			$	0.00
Net income		$	0.62			$	0.60			$	0.34			$	0.40
Diluted income per common share:
From continuing operations		$	0.62			$	0.60			$	0.33			$	0.40
From discontinued operations		$	0.00			$	0.00			$	0.00			$	0.00
Net income		$	0.62			$	0.60			$	0.33			$	0.40