Quarterly Financial Information (Unaudited)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information (Unaudited) [Abstract]

Quarterly Financial Information (Unaudited)

Quarterly Financial Information (Unaudited)

	First		Second		Third		Fourth
	(In Thousands, Except Per Share Data)
Year ended December 31, 2016
Operating revenue	$	162,786	$	160,791	$	149,316	$	140,044
Operating income	20,250		24,507		19,913		20,898
Income before income taxes	20,325		24,616		20,037		21,071
Net income	14,377		16,368		12,527		13,114
Net income per share, basic	0.17		0.20		0.15		0.16
Net income per share, diluted	0.17		0.20		0.15		0.16
Year ended December 31, 2015
Operating revenue	$	187,523	$	191,684	$	182,533	$	174,605
Operating income	28,261		35,739		24,861		27,719
Income before income taxes	28,273		35,800		24,926		27,772
Net income	17,612		23,316		15,113		17,015
Net income per share, basic	0.20		0.27		0.17		0.20
Net income per share, diluted	0.20		0.27		0.17		0.20