Quarterly Financial Data

12 Months Ended

Dec. 31, 2011

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

Quarterly Financial Data (Unaudited)

Quarterly results of operations for the years ended December 31 are summarized below:

	Three Months Ended
	March 31		June 30			September 30		December 31
	(in thousands, except per share amounts)
2011
Operating revenue	$	232,662	$	275,891		$	288,714	$	273,919
Operating income	26,844		34,959			44,556		38,023
Net income (loss)	7,883		16,917			27,657		23,991
Basic earnings (loss) per share	0.30		0.41			0.38		0.33
Diluted earnings (loss) per share	0.30		0.41			0.38		0.33
2010
Operating revenue	$	184,051	$	177,359		$	203,655	$	216,200
Operating income	24,124		1,791			20,982		21,976
Net income (loss) (1)	11,276		(10,066		)	61,740		9,531
Basic earnings (loss) per share	0.43		(0.38		)	2.35		0.36
Diluted earnings (loss) per share	0.42		(0.38		)	2.33		0.36

(1)    Net income for the three months ended September 30, 2010 includes a $53.0 million net tax benefit primarily due to the release of a valuation

allowance resulting in a deferred tax benefit of $53.5 million. Absent the release of the valuation allowance and corresponding tax benefit, our net income would have been $8.2 million for the three months ended September 30, 2010.