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Unaudited Quarterly Financial Data

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Unaudited Quarterly Financial Data

Unaudited Quarterly Financial Data

Summarized quarterly financial data is as follows:

	2015 Quarter Ended
	March				June			September			December
Operating revenue	$	62,112			72,402			82,955			87,613
Operating income	12,805				17,210			18,260			31,685
Net income	4,695				7,461			9,534			16,192
Comprehensive income	4,680				7,206			9,422			16,368
Earnings per share:
—Basic	0.23				0.37			0.47			0.79
—Diluted	0.23				0.36			0.46			0.79
Market price range of stock:
—High	35.60				31.68			31.36			33.68
—Low	30.09				28.68			27.73			27.64
Dividend per share	0.20				0.19			0.20			0.19
	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

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- References

No definition available.

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- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305

Reference 2: 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=35737889&loc=d3e1280-108306

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section G
-Subsection 1

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 302
-Paragraph a

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