Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Data (Unaudited)

Schedule of Quarterly Financial Data (Unaudited)

	Year ended December 31, 2018
	First		Second		Third		Fourth
	Quarter		Quarter		Quarter		Quarter		Year
Operating revenues	$	783,400	$	805,515	$	829,275	$	803,489	$	3,221,679
Operating income		88,175		126,678		137,925		121,502		474,280
Net income		54,362		75,859		83,046		67,105		280,372
Net income per common share:
Basic		1.05		1.46		1.60		1.30		5.40
Diluted		1.03		1.43		1.57		1.28		5.30
Weighted average common shares:
Basic:		51,921		52,046		52,039		51,650		51,914
Diluted:		53,033		52,913		52,981		52,556		52,871

	Year ended December 31, 2017
	First		Second		Third		Fourth
	Quarter		Quarter		Quarter		Quarter		Year
Operating revenues	$	747,166	$	791,512	$	812,673	$	771,241	$	3,122,592
Operating income		76,295		106,596		112,369		92,939		388,199
Net income (1)		34,786		50,477		53,716		289,928		428,907
Net income per common share:
Basic		0.67		0.98		1.04		5.60		8.28
Diluted		0.65		0.95		1.01		5.46		8.08
Weighted average common shares:
Basic:		51,820		51,751		51,833		51,811		51,804
Diluted:		53,202		52,977		53,080		53,140		53,100

Net income for 2017 included a $246.8 million benefit related to the revaluation of the Company’s deferred tax liability and other tax liabilities in accordance with the Tax Act.