Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Data (Unaudited)

Schedule of Quarterly Financial Data (Unaudited)

Unaudited summarized financial data by quarter for 2015 and 2014 is as follows (in thousands, except per share data):

	Year ended December 31, 2015
	First		Second		Third		Fourth
	Quarter		Quarter		Quarter		Quarter		Year
Operating revenues	$	760,398	$	788,417	$	794,004	$	752,744	$	3,095,563
Operating income		34,075		69,932		78,296		52,212		234,515
Net income		9,620		31,475		36,268		40,454		117,817
Net income per common share:
Basic		0.19		0.61		0.72		0.80		2.31
Diluted		0.18		0.61		0.71		0.78		2.27
Weighted average common shares:
Basic:		51,457		51,357		50,616		50,880		51,077
Diluted:		52,392		51,971		51,282		51,657		51,825

	Year ended December 31, 2014
	First		Second		Third		Fourth
	Quarter		Quarter		Quarter		Quarter		Year
Operating revenues	$	772,386	$	816,574	$	834,633	$	813,854	$	3,237,447
Operating income		(27,774)		13,244		59,080		(19,702)		24,848
Net income (loss)		(22,887)		(14,737)		41,338		(27,868)		(24,154)
Net income (loss) per common share:
Basic		(0.44)		(0.29)		0.81		(0.54)		(0.47)
Diluted		(0.44)		(0.29)		0.79		(0.54)		(0.47)
Weighted average common shares:
Basic:		51,467		51,183		51,127		51,174		51,237
Diluted:		51,467		51,183		52,036		51,174		51,237