Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Quarterly results of operations for the year ended December 31, 2013 are summarized below:



	Three Months Ended
	March 31		June 30		September 30		December 31
	(in thousands, except per share amounts)
2013
Operating revenue	$	370,437	$	407,339	$	456,625	$	419,984
Operating income	49,669		66,758		97,804		68,061
Net income	30,554		42,068		61,103		43,193
Basic earnings per share	0.42		0.58		0.84		0.59
Diluted earnings per share	0.42		0.58		0.84		0.59

2012
Operating revenue	$	301,495	$	346,308	$	342,317	$	328,268
Operating income	37,244		55,132		49,681		31,933
Net income	23,419		34,591		30,884		19,566
Basic earnings per share	0.32		0.48		0.43		0.27
Diluted earnings per share	0.32		0.48		0.43		0.27

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

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