Quarterly Results of Operations (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Schedule Of Quarterly Results Of Operations

(In thousands, except per share amounts)	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2014:
Operating revenues	$	492,022	$	542,120	$	551,961	$	553,186
Operating income	23,441		42,330		41,690		52,627
Net income	14,339		25,632		25,970		32,709
Basic earnings per share	0.20		0.36		0.36		0.45
Diluted earnings per share	0.20		0.35		0.36		0.45

(In thousands, except per share amounts)	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2013:
Operating revenues	$	492,887	$	506,648	$	511,728	$	517,920
Operating income	28,693		42,361		32,583		36,089
Net income	17,511		25,840		21,259		22,175
Basic earnings per share	0.24		0.35		0.29		0.31
Diluted earnings per share	0.24		0.35		0.29		0.30