Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Data (Unaudited)

Schedule of Quarterly Financial Data (Unaudited)

Unaudited summarized financial data by quarter for 2013 and 2012 is as follows (in thousands, except per share data):

	Year Ended December 31, 2013
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Year
Operating revenues	$	803,487	$	839,130	$	850,740	$	804,368	$	3,297,725
Operating income		15,561		50,555		56,174		30,820		153,111
Net income (loss)		3,233		20,720		26,394		8,609		58,956
Net income (loss) per common share:
Basic		0.06		0.40		0.51		0.17		1.14
Diluted		0.06		0.39		0.50		0.17		1.12
Weighted average common shares:
Basic:		51,763		51,881		51,881		51,228		51,688
Diluted:		52,497		52,547		52,610		52,034		52,422

	Year Ended December 31, 2012
	First Quarter			Second Quarter		Third Quarter		Fourth Quarter		Year
Operating revenues	$	921,173		$	937,214	$	865,259	$	810,726	$	3,534,372
Operating income		20,457			46,806		54,974		43,750		165,987
Net income (loss)		(682	)		16,960		20,933		13,946		51,157
Net income (loss) per common share:
Basic		(0.01	)		0.33		0.41		0.27		1.00
Diluted		(0.01	)		0.33		0.40		0.27		0.99
Weighted average common shares:
Basic:		50,881			50,944		51,241		51,296		51,090
Diluted:		50,881			51,789		52,153		52,161		51,746