Unaudited Quarterly Financial Data

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Summarized quarterly financial data is as follows:



	2014 Quarter Ended
	March		June	September	December
Operating revenue	$	54,596	70,356	125,430	69,286
Operating income	6,054		12,121	59,114	15,589
Net income	906		6,846	38,366	5,688
Comprehensive income	1,104		5,716	38,095	6,021
Earnings per share:
—Basic	0.04		0.34	1.90	0.28
—Diluted	0.04		0.34	1.88	0.28
Market price range of stock:
—High	30.40		29.51	28.25	32.87
—Low	27.84		25.87	25.64	26.77
Dividend per share	0.19		0.19	0.19	0.19

	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

- 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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