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Unaudited Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

Summarized quarterly financial data is as follows:

	2016 Quarter Ended
	March				June			September			December
Operating revenue	$	61,112			86,944			112,344			79,306
Operating income	10,581				29,800			36,346			16,389
Net income	3,378				16,775			18,959			13,727
Comprehensive income	3,908				15,520			18,790			13,834
Earnings per share:
—Basic	0.17				0.82			0.93			0.67
—Diluted	0.16				0.82			0.92			0.67
Market price range of stock:
—High	37.50				39.38			46.66			56.69
—Low	29.35				32.66			38.13			42.19
Dividend per share	0.20				0.20			0.20			0.20

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- References

No definition available.

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- Definition

Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)-(j)
-URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306

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