Supplemental Financial Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Supplemental Financial Information (unaudited)

Schedule of Selected Quarterly Financial Data

Supplementary Financial Information

	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
	(in thousands)
2012:
Operating revenue	$	435,494		$	484,551		$	549,322		$	492,986
Operating income		12,900			29,328			74,933			12,237
Nonoperating loss		(1,041	)		(23,019	)		(1,130	)		(18,422	)
Net income (loss)		7,258			3,904			45,483			(3,408	)
Net income (loss) per common stock share:
Basic		0.14			0.08			0.88			(0.07	)
Diluted		0.14			0.07			0.86			(0.07	)
2011:
Operating revenue	$	365,609		$	395,015		$	455,859		$	433,975
Operating income (loss)		(4,945	)		(70,181	)		60,947			34,462
Nonoperating income (loss)		6,431			(12,392	)		(13,621	)		(1,783	)
Net income (loss)		855			(50,042	)		25,617			20,921
Net income (loss) per common stock share:
Basic		0.02			(0.99	)		0.50			0.41
Diluted		0.02			(0.99	)		0.50			0.40