Quarterly Results of Operations

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results of Operations

QUARTERLY RESULTS OF OPERATIONS (UNAUDITED)

(In thousands, except per share amounts)	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2015:
Operating revenues	$	495,654	$	534,644	$	534,448	$	528,783
Operating income	38,185		52,210		52,800		57,261
Net income	23,142		31,848		32,076		36,648
Basic earnings per share	0.32		0.44		0.45		0.51
Diluted earnings per share	0.32		0.44		0.44		0.51

(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