Unaudited Quarterly Financial Data

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Unaudited Quarterly Financial Data

Summarized quarterly financial data is as follows:



	2013 Quarter Ended
	March		June	September	December
Operating revenue	$	50,139	74,230	85,238	67,262
Operating income	5,773		16,937	19,346	11,351
Net income	1,317		7,440	8,950	4,677
Comprehensive income	1,671		7,351	9,135	5,304
Earnings per share:
—Basic	0.07		0.37	0.44	0.23
—Diluted	0.07		0.37	0.44	0.23
Market price range of stock:
—High	28.09		27.66	28.52	30.03
—Low	25.70		24.58	25.62	26.40
Dividend per share	0.18		0.18	0.18	0.18

	2012 Quarter Ended
	March		June	September	December
Operating revenue	$	51,149	65,575	82,374	62,449
Operating income	6,725		13,585	20,877	14,110
Net income	1,109		5,201	10,084	5,924
Comprehensive income	1,098		5,260	10,125	5,871
Earnings per share:
—Basic	0.06		0.28	0.54	0.32
—Diluted	0.06		0.28	0.53	0.31
Market price range of stock:
—High	24.91		24.34	25.64	26.62
—Low	22.96		22.81	22.95	22.69
Dividend per share	0.18		0.18	0.18	0.18

- 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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